Make the formulas of the substances: manganese oxide (iv), sodium hydrogen phosphate, ammonium sulfide.

Manganese oxide (IV) – MnO2 is a compound of manganese with oxygen, where manganese has a valence of four. Sodium hydrogen phosphite – NaH2PO3 compound of sodium and hydrogen with a phosphite residue. Ammonium sulfide – (NH4) 2S compound of the ammonium cation with sulfur, which has a valence of two.

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