Helium atom has $2$ electrons in its valence shell,but its valency is not $2$. Explain.
(N/A) The Helium atom has only one shell ($K$-shell),which has a maximum capacity of accommodating $2$ electrons. Since this shell is completely filled,the atom is stable and does not have a tendency to gain,lose,or share electrons with other atoms. Therefore,the valency of Helium is $0$.
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