Answer
MnO₂ Manganese IV oxide
MnBr₄ Manganese IV bromide
Step-by-step explanation
Manganese has the oxidation number +4 in a number of compounds.
Therefore, the formulas and names compounds of Manganese +4 with oxygen and bromine will be as follows:
Oxygen has an oxidation number of -2
The formula of a compound of Manganese +4 with oxygen -2 = MnO₂
The name of the compound ( MnO₂) will be Manganese IV oxide
Bromine has an oxidation number of -1
The formula of a compound of Manganese +4 with bromine -1 = MnBr₄
The name of the compound ( MnBr₄) will be Manganese IV bromide