How is the valency of manganese +2 and not -1?

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Solution

Manganese is a transition metal, meaning that it can have more than one valence state.
Generally we don't use the word valency for the transition metal atoms. Manganese is a transition metal atom.For them we use the term oxidation states. They can show variable oxidation states.

Manganese can show Oxidation states from +2 to +7.

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