Oxide and sulphide ions are respectively ?

Oxide and sulphide ions are both divalent.
Given that they contain

6

electrons in their final shell according to the electrical configuration, it creates

2

valencies and adds

2

electrons to become stable, becoming

O^{- 2}

and

S^{- 2} .

This is similar to the reason why sulphuric acid generates diatomic compounds since it is a molecule with two valencies.

S^{- 2}

and

O^{- 2}

are now present as the sulphide and oxide ions, respectively. As a result, they have a

- 2

valency.

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