Question

Explain that helium atom has 2 electron in its valence shell but it's valence is not 2

Answer 1

Valence shell means the outermost shell electrons which will not paired i.e free to move. As, acc. to your question helium has E.C 1s2 i.e 2 electrons are paired or bound to nucleus. So, its valency is 0. Hope you understand, if not then comment.

Answer 2

Answer:

Helium atom has 2 electrons in its outermost shell and its duplet is complete. Hence the valency of helium atom is zero. It can neither gain nor lose electrons.

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