Lithium does not from stable peroxide because

Lithium forms monoxide only when heated in oxygen. Sodium forms monoxide and peroxide in excess of oxygen. Other alkali metals form superoxide with oxygen i.e MO_(2) . The abnormal behaviour of lithium is due to small size. The larger size of nearer alkali metals also decides the role in formation of superoxides. The three ions are related to each other as follows O^(2-) overset(1/2O_(2))rarrunderset(O_(2^(2-)))overset(O_(2))rarrunderset("superoxide ion")2O_(2) Lithium does not form stable peroxide because

Bismuth does not form stable pentahalides because of

Statement-1:Beryllium does not form peroxide because Statement-2: Be^(2+) ion being of very small size cannot form a stable lattice with larger peroxide ion.

Lithium carbonate is not so stable to heat as the other alkali metal carbonates. Explain.

From Lithium to Caesium stabilities of peroxides and superoxides of alkali metals ------ and the most stable superoxide is ----- due to ----

The species that does not contain peroxide ions is