How many oxygen atoms are there in a molecule of sodium peroxide?
The correct answer is Two.
Compounds containing the $O_2^{2-}$ ion are called peroxides. Sodium peroxide ($Na_2O_2$) is one example. Hydrogen peroxide ($H_2O_2$) is another common example of a compound containing the peroxide linkage ($O-O$). Understanding the peroxide ion helps explain why the formula is $Na_2O_2$ and not, for example, $NaO$ (which would be sodium oxide, containing the $O^{2-}$ ion).
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