(From the
Italian manganese) A grayish-white,
metallic chemical element, usually hard and brittle, which
rusts like
iron but is not
magnetic. It is used in the manufacture of
alloys of
iron,
aluminum, and
copper.
Symbol: Mn
Atomic number: 25
Atomic weight: 54.938049
Density (at room temperature and pressure): 7.4 g/cc
Melting point: 1,246°C
Boiling point: 2,061°C
Valence: +2, +3, +4, +7
Ground state electron configuration: [Ar]3d54s2