Sodium forms which types of oxides?

Metallic oxides:

1. These solids are basically the crystalline solids that just contain a metal cation as well as an Oxide ion.
2. So, Sodium is a metal which will form the metallic oxides and these oxides are just basic in nature.
3. Sodium is basically an alkali metal and with Oxygen it will form Sodium oxide (${\mathrm{Na}}_2\mathrm{O}$).
4. Actually the two Sodium cations and one Oxygen anion will make up the Sodium oxide molecule.
5. So, this ${\mathrm{Na}}_2\mathrm{O}$ will actually features the two Sodium-Oxygen ionic bonds.

Therefore, Sodium forms metallic oxides which are basic in nature: