Question

What is the chemical formula for the compound formed between calcium and bromine?

Answer 1

Calcium is 2A group element. So have two electrons in vacancy shell.

Calcium looses these two balance electrons and form Ca2+ ion.

Bromine is 7A group element. It have 7 electrons in its valance shell. It gain one more electron to form Br- ion.

Hence, to balance charge of Ca2+ , two Br- ions are required.

The reaction is as follows:

Ca2+ + 2 Br- ---------> CaBr2

Hence, the chemical formula for the compound formed between calcium and bromine is CaBr2 . Calcium Bromide.