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Q.

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

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a

True   

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Two valence electrons are present in the electrical configuration of helium atom 1s2, which is a noble gas. Helium possesses two electrons in its outermost shell, completing the duplet configuration and hence having zero valency.
  
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