A positive sodium ion (Na+) has a charge of +1.

Here's why:

* Neutral Sodium Atom: A neutral sodium atom has 11 protons (positive charge) and 11 electrons (negative charge), resulting in a net charge of 0.

* Ionization: Sodium loses one electron to become stable. This loss of a negatively charged electron leaves the sodium ion with one more proton than electrons, giving it a net positive charge of +1.