Oxides are binary compounds formed by the reaction of oxygen with other elements. Oxygen is highly reactive in nature. They react with metals and non-metal to form oxides.

When basic oxides are formed?

Basic oxides, can also called base anhydrides which means "a base without water", are usually formed by reacting of oxygen with metals, especially alkali (+1 oxidation state) and alkaline earth metals (+2 oxidation state).

Why do metals form oxides?

Metals with high oxidation states form oxides whose bonds have a more covalent nature. ... Ionic metal oxides react with water to give hydroxides (compounds containing the OH⁻ ion) and resultant basic solutions, whereas most nonmetal oxides react with water to form acids and resultant acidic solutions (see the table).