Here's how to understand the formula:

* Na: Sodium (Na) is a Group 1 element, meaning it has a +1 charge.

* H₂PO₄: Dihydrogen phosphate is a polyatomic ion with a -1 charge (H₂PO₄⁻).

Since the charges balance out (+1 and -1), the formula NaH₂PO₄ represents the compound accurately.