# What is the chemical formula for chromium(II) bromide?

Chromium(II) bromide = $C r B {r}_{2}$.
For chromium(II) bromide it is stipulated that the metal centre is in a $I {I}^{+}$ oxidation state. Since we deal with $C {r}^{2 +}$, and the normal oxidation state of the halogens is $- I$, i.e. ${X}^{-}$, if they are combined we naturally get the give formula.