[Ricky2015]

I learnt that - " The tendency of alkali metals to form oxygen rich compounds increases from top to bottom in the group i.e. with increasing cationic radii and deceasing charge density on metal ion."

My Doubt :

How does increase in cationic radii and decrease in charge density help in forming oxygen rich compounds ?

[Burner]

How does increase in cationic radii and decrease in charge density help in forming oxygen rich compounds ?

I am not sure, but I think that increase in cationic radii and decrease in charge density reduce the tendency of the atom to attract electrons in the outermost electron shell(attractive force between positive nucleus and electrons decreases), so they donate electrons more readily to oxygen atoms.

[Ricky2015]

How does increase in cationic radii and decrease in charge density help in forming oxygen rich compounds ?

I am not sure, but I think that increase in cationic radii and decrease in charge density reduce the tendency of the atom to attract electrons in the outermost electron shell(attractive force between positive nucleus and electrons decreases), so they donate electrons more readily to oxygen atoms.

thanks