Question

What is the oxidation number of `Br` in the `BrO_3^-` ion?

Answer 1

`Br^(V+)`

Explanation:

The sum of the oxidation numbers equals the charge on the ion. Oxygen normally takes a `-II` oxidation number and it does so here. Thus `-1= -2xx3 + Br^(ON)`.

Capisce?

So what are the oxidation numbers of `Br` in `BrO_4^-` and `KBr` and `BrO^-`?