Here's how it breaks down:
* NH₄⁺: Represents the ammonium ion, which is a positively charged polyatomic ion.
* SO₄²⁻: Represents the sulfate ion, which is a negatively charged polyatomic ion.
* (NH₄)₂: Indicates that there are two ammonium ions.
* SO₄: Indicates one sulfate ion.
The formula reflects that two ammonium ions (each with a +1 charge) balance the charge of one sulfate ion (with a -2 charge).
