Write the oxidation number of oxygen in $KO_{3}$ and $Na_{2}O_{2}$.
(N/A) For $KO_{3}$ (Potassium ozonide):
$1(K) + 3(O) = 0$
$1(+1) + 3(O) = 0$
$3(O) = -1$
$O = -\frac{1}{3}$
For $Na_{2}O_{2}$ (Sodium peroxide):
$2(Na) + 2(O) = 0$
$2(+1) + 2(O) = 0$
$2 + 2(O) = 0$
$2(O) = -2$
$O = -1$
$1(K) + 3(O) = 0$
$1(+1) + 3(O) = 0$
$3(O) = -1$
$O = -\frac{1}{3}$
For $Na_{2}O_{2}$ (Sodium peroxide):
$2(Na) + 2(O) = 0$
$2(+1) + 2(O) = 0$
$2 + 2(O) = 0$
$2(O) = -2$
$O = -1$
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