# What does the name chromium(II) oxide mean in terms of electrons lost and gained?

Dec 4, 2015

The oxidation state of Chromium is $+ 2$.
From the name Chromium(II) oxide we can conclude that Chromium has a $+ 2$ oxidation state.
We know that oxygen has an oxidation state of $- 2$ except in the case of peroxide which is $- 1$ and $O {F}_{2}$ the oxidation state is $+ 2$.
The formula unit of Chromium(II) oxide is $C r O$.