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Question

Question 33
Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.

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Solution

Helium atom has only one shell (K shell) which can have maximum 2 electrons. Thus its shell is already complete called duplet. It can neither lose electrons nor gain electrons. Hence, its valency is 'Zero'. It is called noble gas or inert gas.

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