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Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.

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Answer:

Helium atom has only one shell (K shell) which can have maximum 2 electrons.  Helium atom has 2 electrons in its outermost shell and its duplet is complete. Hence the valency of helium atom is zero. It is called noble gas or inert gas.

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