Here's how to determine this:

* Cesium is a Group 1 element, so it forms a +1 cation (Cs⁺).

* Hypobromite is a polyatomic anion with the formula BrO⁻.

To balance the charges, we need one cesium ion (Cs⁺) and one hypobromite ion (BrO⁻). This results in the formula CsBrO.