Question

why oxygen, sulphur, calcium are divalent elements?

Answer 1

We already know the atomic number of oxygen , sulphur, calcium

Name electronic configuration

Oxygen(8). 2,6

Sulphur(16). 2,8,6

They both want 2 electron to complete there octat.

Calcium(20). 2,8,8,2

But in this it want to lose 2 electron to complete its octat.

So they both are divalent compound.

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Answer 2

Divalent elements include calcium andsulfur. While the bonds formed bycalcium are ionic, sulfur can form covalent bonds as in H2Sor ionic bonds as in Na2s. Divalent anions have a charge of −2, for example S2- and SO4 2-