Why can't we form superoxide with sodium?

If we're looking at reaction of an alkali metal with oxygen to form explosive compounds, perhaps we should look at superoxides. The superoxides are powerful oxidizing agents, and they can explode when mixed with water, acids, organics, or powdered graphite. read more

It is also produced, along with sodium peroxide, when sodium is stored under inappropriate conditions (e.g. in dirty or partially halogenated solvents). Properties. The product is paramagnetic, as expected for a salt of the O − 2 anion. It hydrolyses readily to give a mixture of sodium hydroxide, oxygen and hydrogen peroxide. read more

Hence lithium forms monoxide while in case of sodium charge is located over comparatively bigger atom which allows oxide ion to combine with another oxide ion hence.. Peroxide is formed. While in other case superoxide is formed due to combination. Of two peroxide ions. read more