What ions are present in Na3PO4 and how many of each are present?

In sodium phosphate, Na₃PO₄, there are two types of ions present: sodium ions (Na⁺) and phosphate ions (PO₄^3-).

Specifically, the formula indicates that there are:

• 3 sodium ions (Na⁺)
• 1 phosphate ion (PO₄^3-)

This means that in one formula unit of sodium phosphate, you have three positively charged sodium ions balancing the charge of one negatively charged phosphate ion. The overall charge of the compound is neutral, as the total positive charge from the sodium ions (+3) balances the total negative charge from the phosphate ion (-3).