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Question

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


A
True
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B
False
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Solution

The correct option is A True
Helium atom with electronic configuration  $$1s^{2}$$ has two valence electrons but since it is a noble gas, it does not form a chemical bond, its duplet is complete.Therefore, valency is zero.

Chemistry

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