Answer
Dioxygen gas, $$ O_{2}$$, the stuff we are breathing now...is NEUTRAL.....
Explanation :
Oxygen can form oxides upon REDUCTION........
$$ \dfrac{1}{2}O_{2}(g) + 2e^{-} \rightarrow O^{2-}$$...and since oxygen is a powerful oxidant this reaction is facile. On the other hand, we could form peroxides....i.e. salts of $$ O^{2-}_{2}$$....where each oxygen atom is associated with 9 electrons rather than 8...
$$ O_{2} (g) + 2 e^{-} \rightarrow ^{-}O - O^{-} , i.e ^{-}- O^{-} = O^{2 -}_{2}$$