When Dimitri Mendelev first developed the periodic table, one of the most important features that he introduced was starting a new row at a certain point. What factor was most important to Mendelev in knowing when to end a row (period) and start a new one? A) The reactivity of the elements changed drastically. B) The state of the elements went from solid to liquid. C) The boiling point of the elements decreased dramatically. D) The size of the elements jumped from very large to very small.

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08-12-2018
Chemistry

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When Dimitri Mendelev first developed the periodic table, one of the most important features that he introduced was starting a new row at a certain point. What factor was most important to Mendelev in knowing when to end a row (period) and start a new one? A) The reactivity of the elements changed drastically. B) The state of the elements went from solid to liquid. C) The boiling point of the elements decreased dramatically. D) The size of the elements jumped from very large to very small.

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Аноним Аноним · Answer 1 · 2018-12-08T20:22:40+01:00

Аноним Аноним

08-12-2018

At the end of a period we get an inert gas which is very unreactive compared with the previous element ( a halogen).

The answer is A.

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pstnonsonjoku pstnonsonjoku · Answer 2 · 2021-10-03T15:11:29+02:00

Dimitri Mendelev knew when to end a row (period) and start a new one when the the reactivity of the elements changed drastically.

Dimitri Mendelev was one of the early scientists who attempted a classification of chemical elements based on increasing atomic mass. He had to revise his table many times before he arrived at a classification system that works.

Usually, the reactivity of elements decreases from left to right in the periodic table. At the end of the period, we find noble gases that are unreactive.

Dimitri Mendelev ended a period and started a new one when this sudden change in reactivity of elements occur.

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