Final answer:
The correct name for (NH4)2SO4 is ammonium sulfate, which is an ionic compound formed by two ammonium ions balancing out the charge of one sulfate ion.
Step-by-step explanation:
The correct name for the compound (NH4)2SO4 is ammonium sulfate. This is because the compound consists of two ammonium ions (NH4+), each having a 1+ charge, and one sulfate ion (SO42-), which has a 2- charge. The two ammonium ions balance the charge of the single sulfate ion, resulting in a neutral compound. When naming ionic compounds containing polyatomic ions, the cation keeps the name of the element (ammonium in this case) and the anion is named for its elemental base with an appropriate suffix (sulfate in this case).