Which of the following is an inert element?

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(D) Inert elements,also known as noble gases,are chemically stable elements with a fully filled outer electronic configuration. Because their valence

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$He$

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(D) Inert elements,also known as noble gases,are chemically stable elements with a fully filled outer electronic configuration. Because their valence shells are complete,they do not have the affinity to participate in chemical reactions. Among the given options,$He$ (Helium) has the electronic configuration $1s^2$,which is a stable duplet,making it an inert element.

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