← Back to the periodic table
EN ▾

Element: Indium

General data

Element nameIndium
Chemical symbolIn
Atomic number Z49
Year discovered1863
Standard state (25°C)Solid
CategoryPost-transition metal
Blockp
Atomic mass114.82
CPK color#A67573

Physical properties

Melting point429.75 K (156.60 °C)
Boiling point2345 K (2072 °C)
Density7.31 g/cm³

Energy properties

First ionization energy5.786 eV
Electron affinity0.3 eV

Atomic structure

Protons49 (Atomic number)
Neutrons (In-115, most abundant isotope)66
Electrons49
Electron configuration[Kr] 5s² 4d¹⁰ 5p¹
Oxidation states+3
Electronegativity (Pauling)1.78
Atomic radius (van der Waals)193 pm

Ionization energies - NIST ASD (49 states)

StateChargeIoniz. energy (eV)Type
In I0+5.7863558 ± 0.0000005measured
In II1+18.87041 ± 0.00003measured
In III2+28.04415 ± 0.00012measured
In IV3+55.45 ± 0.04measured
In V4+69.3 ± 1.2semi-empirical
In VI5+90 ± 2calculated
In VII6+109 ± 2calculated
In VIII7+130.1 ± 2.1calculated
In IX8+156 ± 2.2calculated
In X9+178 ± 2.2calculated
In XI10+201 ± 2.4calculated
In XII11+226 ± 2.5calculated
In XIII12+249 ± 3calculated
In XIV13+341 ± 3calculated
In XV14+368 ± 3calculated
In XVI15+396 ± 3calculated
In XVII16+425 ± 3calculated
In XVIII17+462 ± 3calculated
In XIX18+497.1 ± 0.3semi-empirical
In XX19+560 ± 4calculated
In XXI20+593.38 ± 0.2semi-empirical
In XXII21+1043 ± 4calculated
In XXIII22+1109 ± 4calculated
In XXIV23+1181 ± 4calculated
In XXV24+1255 ± 4calculated
In XXVI25+1328 ± 4calculated
In XXVII26+1413 ± 4calculated
In XXVIII27+1496 ± 4calculated
In XXIX28+1575 ± 4calculated
In XXX29+1659 ± 4calculated
In XXXI30+1738 ± 4calculated
In XXXII31+1961 ± 5semi-empirical
In XXXIII32+2028.5 ± 2.1semi-empirical
In XXXIV33+2111 ± 3semi-empirical
In XXXV34+2207 ± 8semi-empirical
In XXXVI35+2317 ± 5semi-empirical
In XXXVII36+2373 ± 11semi-empirical
In XXXVIII37+2555 ± 3semi-empirical
In XXXIX38+2628.77 ± 0.08semi-empirical
In XL39+6126 ± 3semi-empirical
In XLI40+6331 ± 10semi-empirical
In XLII41+6554 ± 13semi-empirical
In XLIII42+6770 ± 50semi-empirical
In XLIV43+7196 ± 8semi-empirical
In XLV44+7442 ± 6semi-empirical
In XLVI45+7754 ± 7semi-empirical
In XLVII46+7953.14 ± 0.03calculated
In XLVIII47+32837.593 ± 0.019calculated
In XLIX48+33750.404 ± 0.01calculated

Value type as given by NIST ASD: measured - from evaluated experimental data; calculated - from ab initio calculations (mostly highly ionised atoms that have not been measured; for the simplest ones, e.g. H I, the calculation is more accurate than measurement); semi-empirical - from interpolation, extrapolation or another semi-empirical method.

Photos

Photo of the element: Indium (In)
© images-of-elements.com (CC BY 3.0)

Isotopes (42)

ANHalf-lifeDecay
In-9647unknownEC/β⁺
In-974836 msEC/β⁺
In-984930 msEC/β⁺
In-99503.11 sEC/β⁺
In-100515.66 sEC/β⁺
In-1015215.1 sEC/β⁺
In-1025323.3 sEC/β⁺
In-1035465 sEC/β⁺
In-104551.80 minEC/β⁺
In-105565.07 minEC/β⁺
In-106576.23 minEC/β⁺
In-1075832.4 minEC/β⁺
In-1085958.0 minEC/β⁺
In-109604.159 hEC/β⁺
In-110614.9 hEC/β⁺
In-111622.8048 dEC
In-1126314.88 minEC/β⁺
In-11364stable-
In-1146571.9 sβ⁻
In-115664.4×10¹⁴ aβ⁻
In-1166714.10 sβ⁻
In-1176843.2 minβ⁻
In-118695.4 sβ⁻
In-119702.4 minβ⁻
In-120713.08 sβ⁻
In-1217223.1 sβ⁻
In-122731.5 sβ⁻
In-123746.17 sβ⁻
In-124753.12 sβ⁻
In-125762.36 sβ⁻
In-126771.53 sβ⁻
In-127781.087 sβ⁻
In-128790.84 sβ⁻
In-12980629 msβ⁻
In-13081277 msβ⁻
In-13182261 msβ⁻
In-13283200 msβ⁻
In-13384162 msβ⁻
In-13485121 msβ⁻
In-1358697 msβ⁻
In-1368785 msβ⁻
In-1378870 msβ⁻

Data sources

More about the data sources