Question

Among the alkali metals why all other metals expect li and na can from superoxide

Answer 1

In the presence of sufficient oxygen, they produce the compound whose formation gives out most energy. That gives the most stable compound.

Answer 2

We know that sodium has a strong reducing capacity, so why does it produce a compound in which the oxygen atom is not reduced to the fullest possible extent?

After posting the question, I read up some more and found this, on Chemguide's page describing the oxidation properties of Group 1 elements:

So why do any of the metals form the more complicated oxides? It is a matter of energetics.

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