# How do you write the formula for chromium (III) sulfide?

Apr 3, 2017

$C {r}_{2} {S}_{3}$

#### Explanation:

Chromium III (Cr) has a charge of 3+
Sulphur (S) has a charge of 2-

When you cross the charges, Chromium ends up having 2 atoms and Sulphur ends up needing 3 atoms, as seen in the formula above