# What is the oxidation number sulfur in H2S?

The sulfur atom in hydrogen sulfide is $\text{-2}$
The sum of the oxidation numbers in a compound must equal zero. In the compound hydrogen sulfide, $\text{H"_2"S}$, the two hydrogen atoms have an oxidation number of $\text{+1}$, for a total of $\text{+2}$. Therefore, the oxidation number of sulfur in the compound is $\text{-2}$, and the sum of the oxidation numbers is $\text{0}$.