Verified answer

I'm not certain (NH4)2MnO4 exists; Did you mean NH4MnO4?

NH4MnO4 is ammonium permanganate (Mn +7)

(NH4)2MnO4 would be ammonium manganate (Mn +6)

Mn can form compounds with oxidation states of 2, 3, 4, 6, and 7

Give "sailor astra" the gold start for the correct answer.

Ammonium Permanganate

Pneumonium Minnesota Quadroxide

The [MnO4] 2- ion is called manganate.

Manganates of alkali metals, strontium and barium do exist mainly because of the fact that their hydroxides are soluble in water.

Ammonium manganate may exist at least as aqueous solution. But it may not be thermally stable.

skipper may be partially correct.

The [MnO4]^-2 ion does exist, its colour is green, and it is called Manganate.

Manganates of Alkali Metals exist, having the formula Alk2[MnO4].

I do not believe that Ammonium Manganate has been synthesized.

(NH4)2 ->Ammonium

MnO4-> permanganate

Ammonium permanganate

ammonium permanganate yes thats it.

buttwax