[user1000]

Electronegativity, charge density, size, formal charge on cation

I can't find any information on how variations in charge density and size affect this. Can someone explain?

Thanks

[Hunter2]

Non metals, like sulfur, selenium, chlorine and others  give oxide which all acidic. Half metals, like arsenic, stibium and metals in 3 to 6 group and heavy metals with oxidation number higher then 4 give give amphotheric oxides. Heavy metals with oxidation number +1 to +3 give alkaline oxides. Group 1 and 2 give only alkaline oxides.