How would you find the oxidation numbers of MgO?

Dec 27, 2015

In the compound

$\text{O=-2 and Mg=+2}$

Explanation:

There is a general rule that the sum of
the oxidation numbers for a pure compound is always zero

There rule for oxygen which states that the oxidation number
always equals -2 in compounds , except in peroxides

So $\left(- 2\right) + \left(\text{oxidation number of Mg}\right) = 0$

$\Rightarrow - 2 + 2 = 0$

So, the oxidation number for $\text{O} = - 2$ and $\text{Mg} = + 2$