Here's how it breaks down:

* (NH₄)₂: This represents two ammonium ions (NH₄⁺).

* HPO₄: This represents the monohydrogen phosphate ion (HPO₄²⁻).

The overall compound is neutral because the charges balance out: 2 (NH₄⁺) + 1 (HPO₄²⁻) = 0.