Question

Why does carbonate have a valency of two?

Answer 1

Carbonate:

• With the chemical formula ${{\mathrm{CO}}_3}^{2-}$, carbonate is a salt of carbonic acid.
• Alkali and alkaline earth metals are the primary categories of elements utilized as carbonates.

Carbonate Valency:

• The structure of the carbonate following the octet rule is

• According to this structure, both the oxygen have a negative sign.
• Valency is defined as the number of bonds formed by the atom that results in compound formation.
• The carbonate can combine with two hydrogen atoms and hence, it has a valency of two.