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

CBSE Class 9 CBSE Class 9 Science
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Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.

Answer:
Helium atom has 2 electrons in its valence shell and its duplet is complete. Hence, the valency is zero.