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1.Dmitry Ivanovich Mendeleyev was born on January 27, 1834 in the city of Tobolsk.
2.Russian scholar, lexicographer, chemist, physicist, metrologist, economist, engineer, geologist, meteorologist, oilman, teacher, balloonist, Instrument.
3.Professor of St. Petersburg University.
4.Corresponding Member of the St. Petersburg Imperial Academy of Sciences.
5.Among the most famous discoveries - zakonhimicheskih periodic elements.
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1.Its initial version was developed by Mendeleev in the years 1869-1871 and established the dependence of the properties of elements from the atomic mass.
2.By the middle of the XIX century 63 chemical elements were discovered. Trying to find patterns in this set have been many times.
3.The first attempt to arrange elements in order of increasing atomic weights taken Emil Chancourtois Alexander (1862).
4. Posted by members vdolvintovoy line and said part of the cyclic repetition of chemical properties of vertically.
5.Both of these models have not attracted the attention of the scientific community
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23 elements discovered by scientists from the UK
On 19 elements discovered by scientists from Switzerland and Germany
On 17 elements discovered by scientists from the US and France
6 elements discovered by scientists from Russia
On 2 element discovered by scientists from Austria, Spain and other
On 1 element discovered by scientists from Finland, Italy and other
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According to legend, the idea of a system of chemical elements in Mendeleev came in a dream.
However, we know that it is not
Once the question of how he discovered the periodic system, the scientist replied, "I'm over it, maybe twenty years of thought, as you think, and suddenly sat... ready."
The essence of Mendeleev's discovery was the fact that with increasing atomic weight of chemical elements change their properties are not monotone, and periodically.
The most common are 3 forms of the periodic table, "short", "long" and "super-long."
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Further development of the periodic system associated with the filling of the empty table cells.
