Which two criteria did Mendeleev use to classify the elements in his periodic table? (b) State Mendeleev’s periodic law. (c) Why could no fixed position be given to hydrogen in Mendeleev’s periodic table? (d) How and why does the atomic size vary as y

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2016-03-05T10:14:43+05:30

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A) Mendeleev used increase in atomic mass and formulae of hydrides and oxides as the 2 main criteria. b) Properties of elements are a periodic function of their atomic masses. c) Hydrogen exists as diatomic molecules, similar to those of Group 17. However, it also has 1 valence electron, like Group 1 elements. Hope it helps :) send me thnx n rate it !
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2016-03-05T14:12:25+05:30

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(a) Increasing atomic mass and Formulae of oxides and hydrides.
(b)Properties of elements are a periodic function of their atomic masses.
(c)Because it can be placed in both Group no. 1 and 17.

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