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Chromium

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

Original source

Chromium (Cr) is chemical element 24, a transition metal in group 6, period 4 (PubChem).

  • Atomic number: 24
  • Symbol: Cr
  • Group: 6
  • Period: 4
  • Atomic mass: 51.996 u
  • Electron configuration: [Ar]3d5 4s1
  • Electronegativity (Pauling scale): 1.66
  • Atomic radius (van der Waals): 189 pm
  • Ionization energy: 6.767 eV
  • Electron affinity: 0.666 eV
  • Oxidation states: +6, +3, +2
  • Standard state: Solid
  • Melting point: 2180 K
  • Boiling point: 2944 K
  • Density: 7.15 g/cm³
  • Chemical group: Transition metal
  • Year discovered: 1797

Source and provenance

Original source
pubchem.ncbi.nlm.nih.gov
Published on Koskamo by
Koskamo
Citation version
Document v1
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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

  1. Published by Koskamo

    Version 1