Is (NH4)2S covalent or ionic

Answer 1

Ionic if it exists. It is an unstable salt and only solutions are available- and they might only analyse as (NH4)2S but may be a mixture of NH3 and (NH4)HS

Answer 2

(NH4)2S is an ionic compound. It is formed from the combination of the ammonium ion (NH4+) and the sulfide ion (S2-), which are both charged particles held together by electrostatic forces in an ionic bond.