Which alkali metal forms preferentially an oxide rather than a peroxide or superoxide?

Question

Quizplus · Accepted Answer

Lithium is the alkali metal which forms preferentially an oxide rather than a peroxide or superoxide. This is due to the smaller size of the lithium ion compared to other alkali metals, which makes it harder for it to form peroxide or superoxide. In addition, the ionization energy of lithium is high which means it requires a lot of energy to remove an electron, making it more difficult for lithium to form superoxide.

Which Alkali Metal Forms Preferentially an Oxide Rather Than a Peroxide