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Cl^(-) ion is more stable than Cl atom -...

`Cl^(-)` ion is more stable than Cl atom - Why?

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An atom or ion with inert gas configuration `(ns^(2)np^(6))` is comparatively more stable.
`Cl(Z)=171s^(2)2s^(2)2p^(6)3s^(2)3p^(5)`
`Cl^(-)1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)`
So `Cl^(-)` is more stable than Cl.
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