Question

Assertion : Valency is zero for noble gases .
Reason : Noble gases except helium have 8 valence electrons.

Answer 1

Answer:

Helium does not exchange or share electrons to form bonds with any other molecules. Helium has one shell (k) which requires two electrons and helium has two-electrons so the outermost shell is filled and helium has no need to lose electrons or gain electrons. Therefore the valency of helium is taken as zero.