Sodium ions are positively charged and therefore are cations.

Here's why:

* Ions are atoms that have gained or lost electrons, giving them a net electrical charge.

* Cations are positively charged ions, meaning they have lost electrons.

* Anions are negatively charged ions, meaning they have gained electrons.

Sodium (Na) normally has 11 protons and 11 electrons, making it neutral. When it becomes a sodium ion (Na+), it loses one electron, leaving it with 11 protons and 10 electrons, resulting in a net positive charge.