Question

Why are He, Ne and Ar are Inert?

Answer 1

Because they have zero valency.

Hence they have not electrons (unstable) in any shell to react with others.

He : 2
Ne : 2,8
Ar : 2,8,8.

Hope it's helpful to u.

Answer 2

Hey there!!

The elements He , Ar and Ne because their outermost shell is complete and does not have valence electrons (having complete octet and duplet) . Due to this they are inert gases and do not react with other elements . and so are called inert or noble gas

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