total number of Alkali metals(non-radioactive) which produces superoxide when burn with excess of O2 is?

To determine the total number of alkali metals (non-radioactive) that produce superoxide when burned with an excess of O2, we need to follow these steps:

1. Identify the alkali metals: The alkali metals include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

2. Determine which alkali metals produce superoxide when burned with excess O2: Among the alkali metals, only potassium (K) and rubidium (Rb) produce superoxide (KO2 and RbO2) when burned with an excess of O2.

3. Calculate the total number of alkali metals that produce superoxide: Since only potassium and rubidium produce superoxide, the total number of alkali metals that produce superoxide is 2.

Therefore, the total number of alkali metals (non-radioactive) that produce superoxide when burned with an excess of O2 is 2.