Indium

Chemical, physical and material properties and data of the chemical element Indium.

Contents

General Information about Indium

Regular nameIndiumChemical symbolInOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Indium

Atomic number Z49 = number of protonsStandard Atomic Weight114.818 (1)

Electron configuration of Indium

1s	2s	2p	3s	3p	3d	4s	4p	4d	4f	5s	5p	5d	5f	6s	6p	6d	6f	7s	7p
2	2	6	2	6	10	2	6	10		2	1

Shorthand electron configuration of Indium: [Kr] 4d¹⁰ 5s² 5p¹ .

Ionization Energies of Indium

The following table lists the ionization energies IE (ionization potentials); the IE is the energy required in electron volt (eV) per atom to separate a given electron from an Indium atom.

IE1	IE2	IE3	IE4
5.78636	18.8703	28.03	54

Isotopic Data of Indium

An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Indium isotopes.

Chemistry of Indium

Oxidation states+3. +1Electronegativity1.7 (Pauling original)
1.78 (Pauling)
1.656 (Allen)
1.3 (Mulliken)
1.88 (Sanderson)
1.49 (Allred-Rochow)
4.253 eV (Gosh Gupta)
3.1 eV (Pearson)Electron affinity0.383 92(6) eV
37.043(6) kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-0.49	In	+III +II	Indium(III) cation Indium(II) cation	In³⁺ ⇄ In²⁺	+ 1 e^-
-0.443	In	+III +I	Indium(III) cation Indium(I) cation	In³⁺ ⇄ In⁺	+ 2 e^-
-0.40	In	+II +I	Indium(II) cation Indium(I) cation	In²⁺ ⇄ In⁺	+ 1 e^-
-0.3382	In	+ III 0	Indium(III) cation Indium	In³⁺ ⇄ In (s)	+ 3 e^-
-0.14	In	+I 0	Indium(II) cation Indium	In⁺ ⇄ In (s)	+ 1 e^-

Material and Physical Properties

Melting point156.5985 °CEnthalpy of fusion (molar)3.281 kJ mol^-1Boiling point2027 °CEnthalpy of vaporization226.4 kJ mol^-1Density7.31 g cm^-3 (20 °C)

External Data, Identifiers

CAS registry number7440-74-6InChI =1S/InInChIKeyAPFVFJFRJDLVQX-UHFFFAOYSA-NPubChem ID5359967

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Last update: 2022-12-12

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