# What is the oxidation number of oxygen in OF_2?

May 12, 2016

$+ 2$

#### Explanation:

Oxygen always has an oxidation number of $- 2$ unless in peroxides, like ${H}_{2} {O}_{2}$, where it has an oxidation of $- 1$.

When $O$ is attached to an even more electronegative element ($F$), it has a positive oxidation number.

You can also check this because $F$ normally has an oxidation of $- 1$ in its compounds, so

$\left(O\right) + 2 \left(F\right) = 0$

$\left(+ 2\right) + 2 \left(- 1\right) = 0$