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Copper

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

Original source

Copper (Cu) is chemical element 29, a transition metal in group 11, period 4 (PubChem).

  • Atomic number: 29
  • Symbol: Cu
  • Group: 11
  • Period: 4
  • Atomic mass: 63.55 u
  • Electron configuration: [Ar]4s1 3d10
  • Electronegativity (Pauling scale): 1.9
  • Atomic radius (van der Waals): 140 pm
  • Ionization energy: 7.726 eV
  • Electron affinity: 1.228 eV
  • Oxidation states: +2, +1
  • Standard state: Solid
  • Melting point: 1357.77 K
  • Boiling point: 2835 K
  • Density: 8.933 g/cm³
  • Chemical group: Transition metal
  • Year discovered: Ancient

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