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Indium (In)

From Wikipedia, the free encyclopediaIndium is a chemical element with symbol In and atomic number 49. It is a post-transition metallic element that is rare in Earth's crust. The metal is very soft, malleable and easily fusible, with a melting point higher than sodium, but lower than lithium or tin.

Indium in the periodic table

Atomic number49
Element categoryPost-Transition Metal

Physical properties

Phase at STPSolid
Density7.31 g/cm3
Atomic weight114.818 u
Melting point429.749 K
156.599 °C
313.8782 °F
Boiling point2345 K
2071.85 °C
3761.33 °F

Atomic properties

Electronegativity (Pauling Scale)1.78
Electron affinity37.043 kJ/mol
Oxidation states−5, −2, −1, +1, +2, +3
(an amphoteric oxide)
Ionization energies
1558.3 kJ/mol
2 1820.7 kJ/mol
3 2704 kJ/mol
4 5210 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Kr] 4d10 5s2 5p1
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p1
Electrons per shell2, 8, 18, 18, 3


Discovered byFerdinand Reich
Hieronymous Theodor Richter
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