Question

What is the formula for barium bromide?

Answer 1

`BaBr_2`...............

Explanation:

Barium is an `"alkaline-earth metal"`............i.e. `"Group 2"`.

And thus barium commonly forms a `Ba^(2+)` ion, just as the halogen bromine, commonly forms a `Br^-`. And hence the salt formed is `BaBr_2`.