I was reading my book, in which it mentioned that aluminium and gallium oxides are amphoteric and and Indium and thalium oxide are basic in their properties. But no explanation was given.
Edit: My main question is we know that mostly metal oxides are basic and non metal oxides are acidic. But we see some metal being amphoteric, what is the cause of this difference ?
I tired to search online but found no reliable piece to read.