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I think amphoteric oxides have both basic and acidic character. For example, H20 can be both an acid and a base, meaning it can donate or accept electrons. They are found diagonally on the periodic table between the metals and the nonmetals near the metalloids.
Acidic and basic oxides are just that, oxides that act as acids or bases. Acidic oxides are usually covalent compounds whereas basic oxides are typically metal oxides. The ones that fall in between, the metalloids, (with a bit of overlap and exceptions) are the amphoteric oxides that can act as either an acid or a base depending on what they are reacting with.
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