Relative atomic mass: 114.818 +- 0.003

English: Indium
French: Indium
Croatian: Indij
German: Indium
Italian: Indio
Spanish: Indio

Atomic number: 49
Group numbers: 13
Period: 5
Standard state (20 oC): solid

Discovery: 1863 Ferdinand Reich, Hieronymus Theodor Richter (DE)
Indium was discovered by Ferdinand Reich and Hieronymus Theodor Richter (DE) in 1863. Named after the indicum (colour indigo), the colour it shows in a spectroscope. It is a rare, very soft, silver-white metal that is stable in air and water but dissolves in acids. Metal can ignite and burn. Indium is found in certain zinc ores. It is used to coat high speed bearings and as an alloy that lowers the melting point of other metals. Relatively small amounts are used in dental items and in electronic semiconductors. The price of 99.9 % pure indium shot is 400.30 for 250 g.
Electronic configuration: [Kr] 4d10 5s2 5p1
Formal oxidation number: +3
Atomic radius: 162.6 pm

Electronegativities: 1.78
Thermal conductivity: 81.6 W/(m K)
Electrical resistivity (20 oC): 8.37 microOhm cm

Melting point: 156.6 oC
Boiling point: 2072 oC

Heat of fusion: 3.27 kJ/mol
Heat of vaporization: 231.8 kJ/mol
Heat of atomization: 243.72 kJ/mol

48Cd <= 49In => 50Sn

ASCII Periodic Table of the Elements
29 Aug. 2017
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