Manganese was discovered by Johann Gahn at 1774 in Sweden.
Origin of name: from the Latin word "magnes" meaning "magnet",
or "magnesia nigri" meaning "black magnesia" (MnO2).
Atomic Number: 25
Atomic Weight: 54.938045
Melting Point: 1519 K (1246°C or 2275°F)
Boiling Point: 2334 K (2061°C or 3742°F)
Density: 7.3 grams per cubic centimeter
Phase at Room Temperature: Solid
Element Classification: Metal
Period Number: 4 Group Number: 7 Group Name: none