(So named (
Latin indicum, "
indigo") in
1863 by
F. Reich and
H. T. Richter,
German metallurgists, because of the two
indigo lines in its
spectrum) A rare
metallic chemical element, soft,
ductile, and silver-white, occurring in some
zinc ores and used in producing
bearings and various
alloys that melt at relatively low temperatures.
Symbol: In
Atomic number: 49
Atomic weight: 114.818
Density (at room temperature and pressure): 7.31 g/cc
Melting point: 156.61°C
Boiling point: 2,080°C
Valence: +3
Ground state electron configuration: [Kr]4d105s25p1