General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles


Name Indium Symbol In
atomic number 49 Atomic weight 114.82
Density @ 293 K 7.31 g/cm3 Atomic volume 15.7 cm3/mol
Group Metal discovered 1863


state (s, l, g) s
melting point 429.81 K boiling point 2353 K
Heat of fusion 3.263 kJ/mol Heat of vaporization 231.50 kJ/mol
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1st ionization energy 558.3 kJ/mole electronegativity 1.78
2nd ionization energy 1820.6 kJ/mole electron affinity 30 kJ/mole
3rd ionization energy 2704.5 kJ/mole Specific heat 0.23 J/gK
heat atomization 243 kJ/mole atoms

Oxidation & Electrons

Shells 2,8,18,18,3 electron configuration [Kr] 4d10 5s2 5p1
minimum oxidation number 0 maximum oxidation number 3
min. common oxidation no. 0 max. common oxidation no. 3
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Appearance & Characteristics

structure distorted fcc structure color silvery-white
uses transistors, photocells toxicity
hardness 1.2 mohs characteristics soft


reaction with air mild, = In2O3 reaction with 6M HCl mild, = H2, InCl3
reaction with 6M HCl mild, = H2, InCl3 reaction with 15M HNO3 mild, = In(NO3)3
reaction with 6M NaOH none
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Other Forms

number of isotopes 2 hydride(s)
oxide(s) In2O3 chloride(s) InCl InCl3


ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 167 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) 94 pm
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thermal conductivity 81.8 J/m-sec-deg electrical conductivity 119.474 1/mohm-cm
polarizability 9.7 A^3


source Zn/Pb smelting by-product rel. abund. solar system -0.735 log
abundance earth's crust -1 log cost, pure 120 $/100g
cost, bulk $/100g
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.