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What are the chemical properties of manganese?

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... manganese [Lat.,=magnet], metallic chemical element; symbol Mn; at. no. 25; at. wt. 54.938; m.p. about 1,244°C; b.p. about 1,962°C; sp. gr. 7.2 to 7.45, depending on form; valence principally +2, +4, or +7.

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