Antimony

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

Antimony (Sb) is chemical element 51, a metalloid in group 15, period 5 (PubChem).

Atomic number: 51
Symbol: Sb
Group: 15
Period: 5
Atomic mass: 121.760 u
Electron configuration: [Kr]5s2 4d10 5p3
Electronegativity (Pauling scale): 2.05
Atomic radius (van der Waals): 206 pm
Ionization energy: 8.64 eV
Electron affinity: 1.07 eV
Oxidation states: +5, +3, -3
Standard state: Solid
Melting point: 903.78 K
Boiling point: 1860 K
Density: 6.685 g/cm³
Chemical group: Metalloid
Year discovered: Ancient

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