Give reasons for the following.
Helium does not react with other elements.

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Solution

Helium being the first noble gas in the periodic table has electronic configuration 2.
It has its duplet filled with 2 electrons and has a stable configuration.
Thus it doesn't accept or give up electrons from it's own shell, therefore Helium is a stable atom and we do not get any covalent/ionic compounds with helium.
Thus Helium has zero valency.

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