Name Indium
Symbol In
Atomic Number 49
Atomic Mass 114.818 atomic mass units
Number of Protons 49
Number of Neutrons 66
Number of Electrons 49
Melting Point 156.61 C
Boiling Point 2000.0 C
Density 7.31 grams per cubic centimeter
Normal Phase Solid
Family Other Metals
Period 5
Cost $1 to $5 per gram depending upon purity



Origin of Name From the indigo color found in its spectrum
Date and Place of Discovery In 1863 in Germany
Discovered by Ferdinand Reich and Hieronymous Theodor Richter
Common Compounds
Interesting facts
  • It was discovered when Reich and Richter were looking for traces of thallium in zinc.
  • It is malleable, soft and easily fusible.
  • Its most common isotope is slightly radioactive, but it is non-toxic.
  • It has a bright luster.
  • It is as abundant as silver but is much easier to harvest since it usually is found in zinc, iron, lead and copper ores.
Common Uses
  • High speed bearings
  • Rectifiers
  • Thermistors
  • Photoconductors
  • Mirrors
  • Low melting allows
  • Solders
  • Light filter in vapor lamps
  • Nuclear control rods


Photo Courtesy of
Chemical Elements
Jefferson Labs
Web Elements

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