→ Acidic Oxides: are often the oxides of non-metals and form acidic solutions.

→ Basic Oxides: are usually formed by reacting oxygen with metals and participate with acids in neutralisation reactions.

→ Neutral Oxides: react with neither acids or bases and do not lead to either acidic or basic solutions.

→ Amphoteric Oxides: exhibit both acidic and basic properties and can chemically react as either an acid or base.

`=>C`

→ Elements in the same column are in the same Periodic Table groups.

`=>A`