Show the formation of sulphide ion.(Atomic number of sulphur =16)

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Solution

Definition of valency.
The number of valence electrons lost or gained by an atom in order to attain stability is called valency.
The atomic number of sulphur = 16
Electronic configuration = 2,8,6
since sulphur has six electrons in its outermost shell, it does not have a stable electronic configuration.
Sulphur gains two electrons and achieves the stable configuration as 2,8,8
$S + 2 e^{-} \to S^{2 -} 2, 8, 6 2, 8, 8$
A sulphur atom( $S$ ) has 16 protons and 16 electrons. On gaining two-electron, it becomes a sulphide ion ( $S^{2 -}$ ).

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