Why is the valency of helium 0, while it has 2 valence electron?

The element’s combining ability, called valency, is equal to the number or need for electrons to be removed from its outermost shell to create an ‘octet. The 1st orbital of the helium atom is located in its single shell. It is fully filled with 2 electrons. Its electronic configuration has 1s2.

The inert gases helium and other complete octets do not normally take part in chemical reactions. They are considered zero-valent elements.


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