Please tell me how to find whether the given oxide is acidic or basic?

If it is a metallic oxide (example Na₂O), then it is basic. If it is a non- metallic oxide (example N₂O₃, SO₃) then it is acid. However,Inchemistry, anamphotericcompound is a molecule or ion that can react both as anacidas well as abase.Many metals (such ascopper,zinc,tin,lead,aluminum, andberyllium) form amphoteric oxides or hydroxides. Amphoterism depends on theoxidation statesof the oxide. Al₂O₃is an example of an amphoteric oxide.