how do we write a chemical formula for the following?strontium bromide,potassium sulfide, potassium sulfite,Chromium(iv) oxide, Calcium chromate, Manganese(ii)oxide, Vanadium(iii)hydroxide.  

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strontium bromide SrBr2potassium sulfide  K2S potassium sulfite K2SO3Chromium(iv) oxide CrO2 Calcium chromate CaCrO4Manganese(ii)oxide  MnOVanadium(iii)hydroxide