Question

what is octect . why is it inactive?
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Answer 1

An atom with an octet is not reactive because it has a filled outer shell of electrons. The atom doesn't need to either gain electrons (for example Cl who has 7 electrons in its outer shell tends to gain an electron when reacting to become Cl^-1.

Answer 2

Octet, in chemistry, the eight-electron arrangement in the outer electron shell of the noble-gas atoms. ... This structure is held responsible for the relative inertness of the noble gases and the chemical behaviour of certain other elements.

An atom with an octet is not reactive because it has a filled outer shell of electrons. The atom doesn't need to either gain electrons (for example Cl who has 7 electrons in its outer shell tends to gain an electron when reacting to become Cl^-1.

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