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Indium

Metalsolid
Symbol: In
Atomic number: 49
Atomic mass: 114.818
Group: Metal
CAS-number: 7440-74-6

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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 18, 3
Orbitals: [Kr] 4d10 5s2 5p1
Electronegativity: 1.7, 1.5
1. Ionization potential: 5.7864 eV
2. Ionization potential: 18.869 eV
3. Ionization potential: 28.03 eV
Oxidation states: 3
Electrical conductivity: 0.116 10^6
Melting point: 156.61 °C
Boiling point: 2080 °C
Specific heat: 0.23 J/gK
Heat of fusion: 3.263 kJ/mol
Heat of vaporization: 231.50 kJ/mol
Thermal conductivity: 0.816 W/cmK
Atomic radius: 2.00 Å
Ionic radius: 0.80 Å (+3)
Covalent radius: 1.44 Å
Atomic volume: 15.7 cm³/mol
Density (293 K): 7.31 g/cm³
Crystal structure: tetragonal
tetragonal

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
111In 0 111 9/2 2.8049d EC View
113In 4.28 112.904 9/2 -- --
113Inm 0 113 1/2 1.658h IT View
114In 0 114 1 1.198m β-, EC, β+ View
114Inm 0 114 0 49.51d IT, EC View
115In 95.72 114.904 9/2 4.4E14y β- View
115Inm 0 115 1/2 4.486h IT, β- View
116In 0 116 1 14.1s β- View
116Inm 0 116 5 54.2m β- View
117In 0 117 9/2 44m β-, β- View
117Inm 0 117 1/2 1.94h β-, IT View

Other info

Name origin:Latin: indicum (color indigo), the color it shows in a spectroscope.
Description:Rare, very soft, silver-white metal
Discovered by:Ferdinand Reich, T. Richter
Year:1863
Place:Germany
Sources:Found in certain zinc ores.
Use(s):Used to coat high speed bearings and as an alloy that lowers the melting point of other metals. Relativly small amounts are used in dental items and in electronic semiconductors.