The compound formed from cesium (Cs) and bromine (Br) is cesium bromide (CsBr).

Here's why:

* Cesium is an alkali metal in Group 1 of the periodic table, meaning it has a +1 charge as an ion (Cs⁺).

* Bromine is a halogen in Group 17 of the periodic table, meaning it has a -1 charge as an ion (Br⁻).

To form a neutral compound, one cesium ion (Cs⁺) combines with one bromide ion (Br⁻), resulting in the formula CsBr.