Chemical element with atomic number 49 (In)
Indium, 49 In Pronunciation (IN -dee-əm ) Appearance silvery lustrous gray
Atomic number (Z ) 49 Group group 13 (boron group) Period period 5 Block p-block Electron configuration [Kr ] 4d10 5s2 5p1 Electrons per shell 2, 8, 18, 18, 3 Phase at STP solid Melting point 429.7485 K (156.5985 °C, 313.8773 °F) Boiling point 2345 K (2072 °C, 3762 °F) Density (at 20° C) 7.290 g/cm3 [ 3] when liquid (at m.p. ) 7.02 g/cm3 Triple point 429.7445 K, ~1 kPa[ 4] Heat of fusion 3.281 kJ/mol Heat of vaporization 231.8 kJ/mol Molar heat capacity 26.74 J/(mol·K) Vapor pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
1196
1325
1485
1690
1962
2340
Oxidation states common: +3
−5,? −2,? −1,? 0,[ 5] +1,[ 6] +2[ 6] [ 7] Electronegativity Pauling scale: 1.78 Ionization energies 1st: 558.3 kJ/mol 2nd: 1820.7 kJ/mol 3rd: 2704 kJ/mol Atomic radius empirical: 167 pm Covalent radius 142±5 pm Van der Waals radius 193 pm Spectral lines of indiumNatural occurrence primordial Crystal structure body-centered tetragonal (tI2 ) Lattice constants a = 325.16 pmc = 494.71 pm (at 20 °C)[ 3] Thermal expansion 32.2× 10−6 /K (at 20 °C)[ a] Thermal conductivity 81.8 W/(m⋅K) Electrical resistivity 83.7 nΩ⋅m (at 20 °C) Magnetic ordering diamagnetic [ 8] Molar magnetic susceptibility −64.0× 10−6 cm3 /mol (298 K)[ 9] Young's modulus 11 GPa Speed of sound thin rod 1215 m/s (at 20 °C) Mohs hardness 1.2 Brinell hardness 8.8–10.0 MPa CAS Number 7440-74-6 Discovery Ferdinand Reich and Hieronymous Theodor Richter (1863) First isolation Hieronymous Theodor Richter (1864)
Category: Indium | references
child table, as reused in {IB-In}
^ "Standard Atomic Weights: Indium" . CIAAW . 2011.
^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)" . Pure and Applied Chemistry . doi :10.1515/pac-2019-0603 . ISSN 1365-3075 .
^ a b c Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements . Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9 .
^ Mangum, B. W. (1989). "Determination of the Indium Freezing-point and Triple-point Temperatures". Metrologia . 26 (4): 211. Bibcode :1989Metro..26..211M . doi :10.1088/0026-1394/26/4/001 .
^ Unstable In(0) carbonyls and clusters have been detected, see [1] , p. 6.
^ a b Greenwood, Norman N. ; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann . p. 28. ISBN 978-0-08-037941-8 .
^ Guloy, A. M.; Corbett, J. D. (1996). "Synthesis, Structure, and Bonding of Two Lanthanum Indium Germanides with Novel Structures and Properties". Inorganic Chemistry . 35 (9): 2616–22. doi :10.1021/ic951378e . PMID 11666477 .
^ Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5 .
^ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics . Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4 .
^ a b Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF) . Chinese Physics C . 45 (3): 030001. doi :10.1088/1674-1137/abddae .
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