In MnSO4, which stands for manganese(II) sulfate, the oxidation number of manganese (Mn) is +2.
The sulfate ion (SO4) has a net charge of -2. Since the overall compound is neutral, the sum of the oxidation numbers of all the elements must add up to zero.
Let's assign "x" as the oxidation number of manganese (Mn):
(+2) + x + 4(-2) = 0
Simplifying the equation:
+2 + x - 8 = 0
x - 6 = 0
x = +6
Therefore, the oxidation number of manganese (Mn) in MnSO4 is +2.