Gas 86 in the periodic table. Periodic system of chemical elements of D.I. Mendeleev

PERIODIC TABLE OF MENDELEEV

The construction of Mendeleev's periodic table of chemical elements corresponds to the characteristic periods of number theory and orthogonal bases. Complementing Hadamard matrices with matrices of even and odd orders creates a structural basis of nested matrix elements: matrices of the first (Odin), second (Euler), third (Mersenne), fourth (Hadamard) and fifth (Fermat) orders.

It is easy to see that orders of magnitude 4 k Hadamard matrices correspond to inert elements with an atomic mass that is a multiple of four: helium 4, neon 20, argon 40 (39.948), etc., but also the foundations of life and digital technology: carbon 12, oxygen 16, silicon 28, germanium 72.

It seems that with Mersenne matrices of orders 4 k-1, on the contrary, everything active, poisonous, destructive and corrosive is connected. But these are also radioactive elements - sources of energy, and lead 207 (the end product, poisonous salts). Fluorine, of course, is 19. The orders of the Mersenne matrices correspond to a sequence of radioactive elements called the actinium series: uranium 235, plutonium 239 (an isotope that is a more powerful source of atomic energy than uranium), etc. These are also alkali metals lithium 7, sodium 23 and potassium 39.

Gallium - atomic weight 68

Orders 4 k–2 Euler matrices (double Mersenne) corresponds to nitrogen 14 (atmospheric base). Table salt is formed by two "mersenne-like" atoms of sodium 23 and chlorine 35, together this combination is typical, just for Euler matrices. The more massive chlorine with a weight of 35.4 is a little short of the Hadamard dimension of 36. Common salt crystals: a cube (! ie, a meek character, Hadamars) and an octahedron (more defiant, this is undoubtedly Euler).

In atomic physics, the iron 56 - nickel 59 transition is the boundary between the elements that provide energy during the synthesis of a larger nucleus (hydrogen bomb) and decay (uranium bomb). The order 58 is famous for the fact that for it there are not only analogues of Hadamard matrices in the form of Belevich matrices with zeros on the diagonal, there are also no many weighted matrices for it - the nearest orthogonal W(58,53) has 5 zeros in each column and row (deep gap ).

In the series corresponding to the Fermat matrices and their substitutions of orders 4 k+1, costs 257 fermii by the will of fate. You can't say anything, an exact hit. Here is gold 197. Copper 64 (63.547) and silver 108 (107.868), symbols of electronics, apparently do not reach gold and correspond to more modest Hadamard matrices. Copper, with its atomic weight not far from 63, is chemically active - its green oxides are well known.

Boron crystals under high magnification

With golden ratio boron is connected - the atomic mass among all other elements is closest to 10 (more precisely, 10.8, the proximity of the atomic weight to odd numbers also affects). Boron is a fairly complex element. Bohr plays a confusing role in the history of life itself. The framework structure in its structures is much more complicated than in diamond. The unique type of chemical bond that allows boron to absorb any impurity is very poorly understood, although a large number of scientists have already received Nobel Prizes for research related to it. The shape of the boron crystal is an icosahedron, five triangles form a vertex.

Platinum Mystery. The fifth element is, without a doubt, noble metals such as gold. Suspension over Hadamard dimension 4 k, for 1 large.

The stable isotope uranium 238

Recall, however, that Fermat numbers are rare (the closest is 257). Native gold crystals have a shape close to a cube, but the pentagram also sparkles. Its closest neighbor, platinum, a noble metal, is less than 4 times less atomic weight away from gold 197. Platinum has an atomic weight not 193, but somewhat increased, 194 (the order of the Euler matrices). A trifle, but it brings her into the camp of a few more aggressive elements. It is worth remembering, in connection with its inertness (it dissolves, perhaps, in aqua regia), platinum is used as an active catalyst for chemical processes.

Spongy platinum ignites hydrogen at room temperature. The nature of platinum is not at all peaceful, iridium 192 behaves more quietly (a mixture of isotopes 191 and 193). It is more like copper, but with the weight and character of gold.

Between neon 20 and sodium 23 there is no element with an atomic weight of 22. Of course, atomic weights are an integral characteristic. But among isotopes, in turn, there is also a curious correlation of properties with the properties of numbers and the corresponding matrices of orthogonal bases. As a nuclear fuel, the isotope uranium 235 (the order of the Mersenne matrices) has the greatest use, in which a self-sustaining nuclear chain reaction is possible. In nature, this element occurs in the stable form uranium 238 (the order of the Euler matrices). There is no element with an atomic weight of 13. As for chaos, the limited number of stable elements of the periodic table and the difficulty of finding high-order level matrices due to the barrier seen in thirteenth-order matrices correlate.

Isotopes of chemical elements, island of stability

The periodic table is one of the greatest discoveries of mankind, which made it possible to streamline knowledge about the world around us and discover new chemical elements. It is necessary for schoolchildren, as well as for everyone who is interested in chemistry. In addition, this scheme is indispensable in other areas of science.

This scheme contains all the elements known to man, and they are grouped depending on atomic mass and serial number. These characteristics affect the properties of the elements. In total, there are 8 groups in the short version of the table, the elements included in one group have very similar properties. The first group contains hydrogen, lithium, potassium, copper, the Latin pronunciation in Russian of which is cuprum. And also argentum - silver, cesium, gold - aurum and francium. The second group contains beryllium, magnesium, calcium, zinc, followed by strontium, cadmium, barium, and the group ends with mercury and radium.

The third group includes boron, aluminum, scandium, gallium, then yttrium, indium, lanthanum, and the group ends with thallium and actinium. The fourth group begins with carbon, silicon, titanium, continues with germanium, zirconium, tin, and ends with hafnium, lead, and rutherfordium. In the fifth group there are elements such as nitrogen, phosphorus, vanadium, arsenic, niobium, antimony are located below, then bismuth tantalum comes and completes the dubnium group. The sixth begins with oxygen, followed by sulfur, chromium, selenium, then molybdenum, tellurium, then tungsten, polonium and seaborgium.

In the seventh group, the first element is fluorine, followed by chlorine, manganese, bromine, technetium, followed by iodine, then rhenium, astatine and borium. The last group is the most numerous. It includes gases such as helium, neon, argon, krypton, xenon and radon. This group also includes the metals iron, cobalt, nickel, rhodium, palladium, ruthenium, osmium, iridium, platinum. Next come hannium and meitnerium. Separately located elements that form the actinide series and the lanthanide series. They have similar properties to lanthanum and actinium.

This scheme includes all types of elements, which are divided into 2 large groups - metals and non-metals with different properties. How to determine whether an element belongs to a particular group, a conditional line will help, which must be drawn from boron to astatine. It should be remembered that such a line can only be drawn in the full version of the table. All elements that are above this line and are located in the main subgroups are considered non-metals. And which are lower, in the main subgroups - metals. Also, metals are substances that are in side subgroups. There are special pictures and photos on which you can get acquainted with the position of these elements in detail. It is worth noting that those elements that are on this line exhibit the same properties of both metals and non-metals.

A separate list is also made up of amphoteric elements, which have dual properties and can form 2 types of compounds as a result of reactions. At the same time, they manifest equally both basic and acid properties. The predominance of certain properties depends on the reaction conditions and the substances with which the amphoteric element reacts.

It should be noted that this scheme in the traditional execution of good quality is color. At the same time, different colors for ease of orientation are indicated main and secondary subgroups. And also elements are grouped depending on the similarity of their properties.
However, at present, along with the color scheme, the black-and-white periodic table of Mendeleev is very common. This form is used for black and white printing. Despite the apparent complexity, working with it is just as convenient, given some of the nuances. So, in this case, it is possible to distinguish the main subgroup from the secondary one by differences in shades that are clearly visible. In addition, in the color version, elements with the presence of electrons on different layers are indicated different colors.
It is worth noting that in a single-color design it is not very difficult to navigate the scheme. For this, the information indicated in each individual cell of the element will be enough.

The exam today is the main type of test at the end of school, which means that special attention must be paid to preparing for it. Therefore, when choosing final exam in chemistry, you need to pay attention to the materials that can help in its delivery. As a rule, schoolchildren are allowed to use some tables during the exam, in particular, the periodic table in good quality. Therefore, in order for it to bring only benefit in tests, attention should be paid in advance to its structure and the study of the properties of the elements, as well as their sequence. You also need to learn use the black and white version of the table so that you don't face any difficulties in the exam.

In addition to the main table characterizing the properties of elements and their dependence on atomic mass, there are other schemes that can help in the study of chemistry. For example, there are tables of solubility and electronegativity of substances. The first one can determine how soluble a particular compound is in water at ordinary temperature. In this case, anions are located horizontally - negatively charged ions, and cations, that is, positively charged ions, are located vertically. To find out degree of solubility of one or another compound, it is necessary to find its components in the table. And at the place of their intersection there will be the necessary designation.

If it is the letter "r", then the substance is completely soluble in water under normal conditions. In the presence of the letter "m" - the substance is slightly soluble, and in the presence of the letter "n" - it almost does not dissolve. If there is a “+” sign, the compound does not form a precipitate and reacts with the solvent without residue. If a "-" sign is present, it means that such a substance does not exist. Sometimes you can also see the sign “?” in the table, then this means that the degree of solubility of this compound is not known for certain. Electronegativity of the elements can vary from 1 to 8, there is also a special table to determine this parameter.

Another useful table is the metal activity series. All metals are located in it by increasing the degree of electrochemical potential. A series of stress metals begins with lithium, ends with gold. It is believed that the more to the left a metal occupies in this row, the more active it is in chemical reactions. Thus, the most active metal Lithium is considered to be an alkaline metal. Hydrogen is also present at the end of the list of elements. It is believed that the metals that are located after it are practically inactive. Among them are elements such as copper, mercury, silver, platinum and gold.

Periodic table pictures in good quality

This scheme is one of the greatest achievements in the field of chemistry. Wherein There are many types of this table.- a short version, a long one, as well as an extra long one. The most common is the short table, and the long version of the schema is also common. It is worth noting that the short version of the scheme is not currently recommended by IUPAC for use.
Total was more than a hundred types of tables have been developed, which differ in presentation, shape, and graphical representation. They are used in various fields of science, or not used at all. Currently, new circuit configurations continue to be developed by researchers. As the main option, either a short or a long circuit in excellent quality is used.

How it all began?

Many well-known eminent chemists at the turn of the XIX-XX centuries have long noticed that the physical and chemical properties of many chemical elements are very similar to each other. For example, Potassium, Lithium and Sodium are all active metals, which, when interacting with water, form active hydroxides of these metals; Chlorine, Fluorine, Bromine in their compounds with hydrogen showed the same valence equal to I and all these compounds are strong acids. From this similarity, the conclusion has long been suggested that all known chemical elements can be combined into groups, and so that the elements of each group have a certain set of physicochemical characteristics. However, such groups were often incorrectly compiled from different elements by various scientists, and for a long time one of the main characteristics of the elements was ignored by many - this is their atomic mass. It was ignored because it was and is different for different elements, which means it could not be used as a parameter for grouping. The only exception was the French chemist Alexander Emile Chancourtua, who tried to arrange all the elements in a three-dimensional model along a helix, but his work was not recognized by the scientific community, and the model turned out to be cumbersome and inconvenient.

Unlike many scientists, D.I. Mendeleev took atomic mass (at that time still "Atomic weight") as a key parameter in the classification of elements. In his version, Dmitry Ivanovich arranged the elements in ascending order of their atomic weights, and here a pattern emerged that at certain intervals of the elements, their properties are periodically repeated. True, exceptions had to be made: some elements were swapped and did not correspond to the increase in atomic masses (for example, tellurium and iodine), but they corresponded to the properties of the elements. The further development of the atomic and molecular theory justified such advances and showed the validity of this arrangement. You can read more about this in the article "What is the discovery of Mendeleev"

As we can see, the layout of the elements in this version is not at all the same as we see in the modern form. Firstly, groups and periods are reversed: groups horizontally, periods vertically, and secondly, there are a bit too many groups in it - nineteen, instead of eighteen accepted today.

However, just a year later, in 1870, Mendeleev formed a new version of the table, which is already more recognizable to us: similar elements are lined up vertically, forming groups, and 6 periods are arranged horizontally. It is especially noteworthy that in both the first and second versions the tables are visible significant achievements that his predecessors did not have: places were carefully left in the table for elements that, according to Mendeleev, had yet to be discovered. The corresponding vacancies are indicated by him with a question mark and you can see them in the picture above. Subsequently, the corresponding elements were indeed discovered: Galium, Germanium, Scandium. Thus, Dmitry Ivanovich not only systematized the elements into groups and periods, but also predicted the discovery of new, not yet known, elements.

Later, after resolving many of the topical mysteries of chemistry of that time - the discovery of new elements, the isolation of a group of noble gases together with the participation of William Ramsay, the establishment of the fact that Didymium is not an independent element at all, but is a mixture of two others - more and more new and new versions of the table, sometimes even having a non-table view at all. But we will not give them all here, but we will give only the final version, which was formed during the life of the great scientist.

Transition from atomic weights to nuclear charge.

Unfortunately, Dmitry Ivanovich did not live to see the planetary theory of the structure of the atom and did not see the triumph of Rutherford's experiments, although it was with his discoveries that a new era began in the development of the periodic law and the entire periodic system. Let me remind you that from the experiments conducted by Ernest Rutherford, it followed that the atoms of the elements consist of a positively charged atomic nucleus and negatively charged electrons revolving around the nucleus. After determining the charges of the atomic nuclei of all the elements known at that time, it turned out that in the periodic system they are located in accordance with the charge of the nucleus. And the periodic law has acquired a new meaning, now it began to sound like this:

"The properties of chemical elements, as well as the forms and properties of the simple substances and compounds they form, are in a periodic dependence on the magnitude of the charges of the nuclei of their atoms"

Now it became clear why some of the lighter elements were put by Mendeleev behind their heavier predecessors - the whole point is that this is how they stand in the order of the charges of their nucleus. For example, tellurium is heavier than iodine, but it is earlier in the table, because the charge of the nucleus of its atom and the number of electrons is 52, while iodine has 53. You can look at the table and see for yourself.

After the discovery of the structure of the atom and the atomic nucleus, the periodic system underwent several more changes, until, finally, it reached the form already familiar to us from school, the short-period version of the periodic table.

In this table, we already know everything: 7 periods, 10 series, side and main subgroups. Also, with the time of the discovery of new elements and filling the table with them, elements like Actinium and Lanthanum had to be placed in separate rows, all of them were respectively named Actinides and Lanthanides. This version of the system existed for a very long time - in the world scientific community almost until the end of the 80s, the beginning of the 90s, and in our country even longer - until the 10s of this century.

A modern version of the periodic table.

However, the option that many of us went through at school actually turns out to be very confusing, and the confusion is expressed in the division of subgroups into main and secondary ones, and remembering the logic of displaying the properties of elements becomes quite difficult. Of course, despite this, many studied it, became doctors of chemical sciences, but still in modern times a new version has come to replace it - a long-period one. I note that this particular option is approved by IUPAC (International Union of Pure and Applied Chemistry). Let's take a look at it.

Eight groups were replaced by eighteen, among which there is no longer any division into main and secondary, and all groups are dictated by the arrangement of electrons in the atomic shell. At the same time, they got rid of two-row and single-row periods, now all periods contain only one row. How convenient is this option? Now the periodicity of the properties of elements is viewed more clearly. The group number, in fact, indicates the number of electrons in the outer level, and therefore all the main subgroups of the old version are located in the first, second and thirteenth to eighteenth groups, and all the "former side" groups are located in the middle of the table. Thus, it is now clearly seen from the table that if this is the first group, then these are alkali metals and no copper or silver for you, and it is clear that all transit metals demonstrate well the similarity of their properties due to the filling of the d-sublevel, which affects to a lesser extent external properties, as well as lanthanides and actinides, exhibit similar properties due to only the f-sublevel being different. Thus, the whole table is divided into the following blocks: s-block, on which s-electrons are filled, d-block, p-block and f-block, with filling of d, p, and f-electrons, respectively.

Unfortunately, in our country this option has been included in school textbooks only in the last 2-3 years, and even then not in all. And very wrong. What is it connected with? Well, firstly, with stagnant times in the dashing 90s, when there was no development at all in the country, not to mention the education sector, namely in the 90s, the world chemical community switched to this option. Secondly, with a slight inertia and difficulty in perceiving everything new, because our teachers are accustomed to the old, short-term version of the table, despite the fact that it is much more difficult and less convenient when studying chemistry.

Expanded version of the periodic system.

But time does not stand still, science and technology too. The 118th element of the periodic system has already been discovered, which means that the next, eighth, period of the table will soon have to be discovered. In addition, a new energy sublevel will appear: the g-sublevel. The elements of its constituents will have to be moved down the table, like lanthanides or actinides, or this table will be expanded twice more, so that it will no longer fit on an A4 sheet. Here I will give only a link to Wikipedia (see Extended Periodic System) and will not repeat the description of this option once again. Anyone who is interested can follow the link and have a look.

In this version, neither f-elements (lanthanides and actinides) nor g-elements ("elements of the future" from Nos. 121-128) are listed separately, but make the table wider by 32 cells. Also, the element Helium is placed in the second group, since it is included in the s-block.

In general, it is unlikely that future chemists will use this option, most likely the periodic table will be replaced by one of the alternatives that are already put forward by brave scientists: the Benfey system, Stewart's "Chemical Galaxy" or another option. But this will be only after the achievement of the second island of stability of chemical elements and, most likely, it will be necessary more for clarity in nuclear physics than in chemistry, but for now, the good old Dmitry Ivanovich's periodic system will suffice.

Secret sections of the periodic table June 15th, 2018

Many people have heard about Dmitri Ivanovich Mendeleev and about the “Periodic law of changes in the properties of chemical elements by groups and series” discovered by him in the 19th century (1869) (the author’s name of the table is “Periodic system of elements by groups and series”).

The discovery of the table of periodic chemical elements was one of the important milestones in the history of the development of chemistry as a science. The pioneer of the table was the Russian scientist Dmitry Mendeleev. An extraordinary scientist with the broadest scientific horizons managed to combine all ideas about the nature of chemical elements into a single coherent concept.

Table opening history

By the middle of the 19th century, 63 chemical elements had been discovered, and scientists all over the world repeatedly attempted to combine all the existing elements into a single concept. The elements were proposed to be placed in ascending order of atomic mass and divided into groups according to the similarity of chemical properties.

In 1863, the chemist and musician John Alexander Newland proposed his theory, who proposed a layout of chemical elements similar to that discovered by Mendeleev, but the work of the scientist was not taken seriously by the scientific community due to the fact that the author was carried away by the search for harmony and the connection of music with chemistry.

In 1869, Mendeleev published his scheme of the periodic table in the journal of the Russian Chemical Society and sent out a notice of the discovery to the leading scientists of the world. In the future, the chemist repeatedly refined and improved the scheme until it acquired its familiar form.

The essence of Mendeleev's discovery is that with an increase in the atomic mass, the chemical properties of elements do not change monotonously, but periodically. After a certain number of elements with different properties, the properties begin to repeat. Thus, potassium is similar to sodium, fluorine is similar to chlorine, and gold is similar to silver and copper.

In 1871, Mendeleev finally united the ideas into the Periodic Law. Scientists predicted the discovery of several new chemical elements and described their chemical properties. Subsequently, the chemist's calculations were fully confirmed - gallium, scandium and germanium fully corresponded to the properties that Mendeleev attributed to them.

But not everything is so simple and there is something we do not know.

Few people know that D. I. Mendeleev was one of the first world-famous Russian scientists of the late 19th century, who defended in world science the idea of ​​ether as a universal substantial entity, who gave it fundamental scientific and applied significance in revealing the secrets of Being and to improve the economic life of the people.

There is an opinion that the periodic table of chemical elements officially taught in schools and universities is a fake. Mendeleev himself, in his work entitled "An attempt at a chemical understanding of the world ether," cited a slightly different table.

The last time, in an undistorted form, the real Periodic Table saw the light in 1906 in St. Petersburg (textbook "Fundamentals of Chemistry", VIII edition).

The differences are visible: the zero group is moved to the 8th, and the element lighter than hydrogen, with which the table should begin and which is conditionally called Newtonium (ether), is generally excluded.

The same table is immortalized by the "BLOODY TYRANT" comrade. Stalin in St. Petersburg, Moskovsky Ave. 19. VNIIM them. D. I. Mendeleeva (All-Russian Research Institute of Metrology)

The monument-table The Periodic Table of Chemical Elements of D. I. Mendeleev was made with mosaics under the guidance of Professor of the Academy of Arts V. A. Frolov (architectural design of Krichevsky). The monument is based on a table from the last lifetime 8th edition (1906) of the Fundamentals of Chemistry by D. I. Mendeleev. Elements discovered during the life of D. I. Mendeleev are marked in red. Elements discovered from 1907 to 1934 , are marked in blue.

Why and how did it happen that we are so brazenly and openly lied to?

Place and role of the world ether in the true table of D. I. Mendeleev

Many have heard about Dmitri Ivanovich Mendeleev and about the “Periodic Law of Changes in the Properties of Chemical Elements by Groups and Series” discovered by him in the 19th century (1869) (the author’s name for the table is “The Periodic Table of Elements by Groups and Series”).

Many also heard that D.I. Mendeleev was the organizer and permanent leader (1869-1905) of the Russian public scientific association called the Russian Chemical Society (since 1872 - the Russian Physico-Chemical Society), which throughout its existence published the world-famous journal ZhRFKhO, up to until the liquidation by the Academy of Sciences of the USSR in 1930 - both the Society and its journal.
But few of those who know that D. I. Mendeleev was one of the last world-famous Russian scientists of the late 19th century, who defended in world science the idea of ​​ether as a universal substantial entity, who gave it fundamental scientific and applied significance in revealing secrets Being and to improve the economic life of people.

Even fewer of those who know that after the sudden (!!?) death of D. I. Mendeleev (01.27.1907), who was then recognized as an outstanding scientist by all scientific communities around the world except for the St. Petersburg Academy of Sciences alone, his main discovery is “Periodic law” was deliberately and everywhere falsified by world academic science.

And there are very few who know that all of the above is linked together by a thread of sacrificial service of the best representatives and bearers of the immortal Russian Physical Thought for the good of the peoples, for public benefit, despite the growing wave of irresponsibility in the upper strata of society of that time.

In essence, this dissertation is devoted to the comprehensive development of the last thesis, because in true science any neglect of essential factors always leads to false results.

The elements of the zero group begin each row of other elements, located on the left side of the Table, “... which is a strictly logical consequence of understanding the periodic law” - Mendeleev.

Particularly important and even exceptional in the sense of the periodic law, the place belongs to the element "x", - "Newtonius", - the world ether. And this special element should be located at the very beginning of the entire Table, in the so-called “zero group of the zero row”. Moreover, being a system-forming element (more precisely, a system-forming entity) of all elements of the Periodic Table, the world ether is a substantive argument for the entire variety of elements of the Periodic Table. The Table itself, in this regard, acts as a closed functional of this very argument.

Sources:

The discovery by Dmitri Mendeleev of the periodic table of chemical elements in March 1869 was a real breakthrough in chemistry. The Russian scientist managed to systematize knowledge about chemical elements and present them in the form of a table, which even now schoolchildren must study in chemistry classes. The periodic table became the foundation for the rapid development of this complex and interesting science, and the history of its discovery is shrouded in legends and myths. For all those who are fond of science, it will be interesting to know the truth about how Mendeleev discovered the table of periodic elements.

The history of the periodic table: how it all began

Attempts to classify and systematize known chemical elements were made long before Dmitri Mendeleev. Their systems of elements were proposed by such famous scientists as Debereiner, Newlands, Meyer and others. However, due to the lack of data on the chemical elements and their correct atomic masses, the proposed systems were not entirely reliable.

The history of the discovery of the periodic table begins in 1869, when a Russian scientist at a meeting of the Russian Chemical Society told his colleagues about his discovery. In the table proposed by the scientist, the chemical elements were arranged depending on their properties, provided by the value of their molecular weight.

An interesting feature of the periodic table was also the presence of empty cells, which in the future were filled with discovered chemical elements predicted by the scientist (germanium, gallium, scandium). After the discovery of the periodic table, additions and amendments were made to it many times. Together with the Scottish chemist William Ramsay, Mendeleev added a group of inert gases (zero group) to the table.

In the future, the history of Mendeleev's periodic table was directly related to discoveries in another science - physics. Work on the table of periodic elements is still ongoing, with modern scientists adding new chemical elements as they are discovered. The importance of the periodic system of Dmitri Mendeleev is difficult to overestimate, because thanks to it:

• Knowledge about the properties of already discovered chemical elements was systematized;
• It became possible to predict the discovery of new chemical elements;
• Such branches of physics as the physics of the atom and the physics of the nucleus began to develop;

There are many options for depicting chemical elements according to the periodic law, but the most famous and common option is the periodic table familiar to everyone.

Myths and facts about the creation of the periodic table

The most common misconception in the history of the discovery of the periodic table is that the scientist saw it in a dream. In fact, Dmitri Mendeleev himself refuted this myth and stated that he had been thinking about the periodic law for many years. To systematize the chemical elements, he wrote out each of them on a separate card and repeatedly combined them with each other, arranging them in rows depending on their similar properties.

The myth of the scientist's "prophetic" dream can be explained by the fact that Mendeleev worked on the systematization of chemical elements for days on end, interrupted by a short sleep. However, only the hard work and natural talent of the scientist gave the long-awaited result and provided Dmitri Mendeleev with worldwide fame.

Many students at school, and sometimes at the university, are forced to memorize or at least roughly navigate the periodic table. To do this, a person must not only have a good memory, but also think logically, linking elements into separate groups and classes. Studying the table is easiest for those people who constantly keep their brain in good shape by taking trainings on BrainApps.