Question

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Explain the defects of Modern periodic table .

Class - 10th
Chapter - Periodic classification of elements.

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Answer 1

Hydrogen can both lose as well as gain an electron, so it can be placed in group 1, as it usually is, or with the halogens in group 7.

Helium can also removed from its usual place among the noble gases and moved to join the alkaline earths, with the likes of beryllium. This move can be justified on the basis of the outer-electron structure of helium, which possesses two such electrons, as do the members of the alkaline earth group.

Answer 2

Explanation:

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