Manganese is element 25, a transition metal of the d block, in group 7, period 4. Its ground-state configuration is [Ar] 3d5 4s2, and it usually shows the oxidation states 0, 2, 3, 4, 6, 7.
It was discovered in 1774, by Gahn.
Name origin: corrupted from magnesia negra, see Magnesium.
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