Indium

Post-transition metal · 114.818 u · group 13, period 5

Indium · In

Atomic number49

SymbolIn

CategoryPost-transition metal

Standard stateSolid

Group · Period · Block13 · 5 · p

Electron configuration[Kr]5s2 4d10 5p1

Atomic mass114.818 u

Atomic radius193 pm

Protons / Neutrons / Electrons49 / 66 / 49

Shells (e⁻ per shell)2, 8, 18, 18, 3

Electronegativity (Pauling)1.78

Ionization energy5.786 eV

Electron affinity0.3 eV

Oxidation states+3

Melting point429.8 K · 156.6 °C

Boiling point2.35e+3 K · 2.07e+3 °C

Density7.31 g/cm³

Year discovered1863

CPK color

#A67573

State at room temp (25 °C)

solid

Position