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Mendeleev’s prognosticative accuracy certainly attracted attention to the merits of his table.

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The law’s approval may have been more due to its power to explain established chemical relationships.

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Mendeleev’s table did more than foretell the existence of new elements.

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His table finished the transformation of chemical science from the medieval magical mysticism of alchemy to the realm of modern scientific rigor.

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The periodic table symbolizes not merely the constituents of matter, but the logical cogency and principled rationality of all science.

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“The law of periodicity first enabled us to perceive undiscovered elements at a distance which formerly was inaccessible to chemical vision.”

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“Before the promulgation of this law the chemical elements were mere fragmentary, incidental facts in Nature,” Mendeleev declared.

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“The periodic table,” wrote the chemist Peter Atkins, “is arguably the most important concept in chemistry.”

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Other chemists perceived links between atomic weights and chemical properties

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Döbereiner noted that certain sets of three elements (he called them triads) showed a peculiar relationship.

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Hundreds of versions of the periodic table have been devised and published. The modern form, a horizontal design in contrast with Mendeleev’s original vertical version

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Bohr created his own version of the table in 1922, based on experimental measurements of electron energies (along with some guidance from the periodic law).

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By the time of Mendeleev’s death in 1907, scientists knew that atoms had parts:

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By the time of Mendeleev’s death in 1907, scientists knew that atoms had parts:

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electrons, which carried a negative electric charge, plus some positively charged component to make atoms electrically neutral.

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the amount of positive charge in the nucleus (the number of protons it contained, or its “atomic number”) determined the correct order of the elements in the periodic table.

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the predictions of new elements emerged without any creative mathematics.

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Mendeleev had discovered a deep mathematical map of nature, for his table reflected the implications of quantum mechanics, the mathematical rules governing atomic architecture.

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Mendeleev’s table did anticipate (and provide evidence for) the complex internal structure of atoms, at a time when nobody had any idea what an atom really looked like, or even whether it had any internal structure at all.

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Mendeleev had noted that “internal differences of the matter that comprises the atoms” could be responsible for the elements’ periodically recurring properties.

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created 150 years ago this March by the Russian chemist Dmitrii Ivanovich Mendeleev.

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The periodic table it’s a table that organizes elements

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Bromine, for example, had an atomic weight midway between the weights of chlorine and iodine, and all three elements exhibited similar chemical behavior. Lithium, sodium and potassium were also a triad.

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Amazing discovery that changes chemistry

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It enumerates the elements that compose all earth elements revealing their properties and their Chemical theories.

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The theory of the weight made the idea of the atoms useful

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The periodic table summarizes the entire science in 100 squares containing símbolos and numbers.

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Oxygen atoms weighed 8 times as much as hydrogen atoms

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Carbon is 12 times heavier than hydrogen

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Not only had Mendeleev predicted the existence of these elements, but he had also correctly described their properties in detail.

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Dalton was wrong about some of the weights - oxygen is really 16 times the weight of hydrogen

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Dalton proposed new substances when atoms where disconnected or joined

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Johan Wolfgang noticed the peculiarities in groupings in 1817

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Neweton’s Principia of 1867, the book that introduced the laws of motion and gravity the periodic table was 150 years ago by the Russian chemist Dimitri Ivanihavihc

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Legend says that Mendeleev did his table in 1 day. February 17 1869

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Mendeleev’s table had become an oracle. It was as if end-of-game Scrabble tiles spelled out the secrets of the universe.

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he structured his thinking by writing each of the 63 known elements’ properties on an individual note card.

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“Elements arranged according to the size of their atomic weights show clear periodic properties”

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By early 1869, Mendeleev had made enough progress to realize that some groups of similar elements showed a regular increase in atomic weights

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It’s divided by periods

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The periodic table is also divided by groups

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It was created by Mendeleev

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It’s a tool to recognize elements and their atoms easier

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other elements with roughly equal atomic weights shared common properties.

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It appeared that ordering the elements by their atomic weight was the key to categorizing them.