Indium

Document v1 · published by Koskamo · updated 2026-10-04

Indium (In) is chemical element 49, a post-transition metal in group 13, period 5 (PubChem).

Atomic number: 49
Symbol: In
Group: 13
Period: 5
Atomic mass: 114.818 u
Electron configuration: [Kr]5s2 4d10 5p1
Electronegativity (Pauling scale): 1.78
Atomic radius (van der Waals): 193 pm
Ionization energy: 5.786 eV
Electron affinity: 0.3 eV
Oxidation states: +3
Standard state: Solid
Melting point: 429.75 K
Boiling point: 2345 K
Density: 7.31 g/cm³
Chemical group: Post-transition metal
Year discovered: 1863

Source and provenance

Original source: pubchem.ncbi.nlm.nih.gov
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: PubChem periodic table data (NIH/NLM, pubchem.ncbi.nlm.nih.gov/ptable); group and period from Jefferson Lab via PubChem

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Version history

Published by Koskamo2026-10-04
Version 1