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Ruthenium

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

Original source

Ruthenium (Ru) is chemical element 44, a transition metal in group 8, period 5 (PubChem).

  • Atomic number: 44
  • Symbol: Ru
  • Group: 8
  • Period: 5
  • Atomic mass: 101.1 u
  • Electron configuration: [Kr]5s1 4d7
  • Electronegativity (Pauling scale): 2.2
  • Atomic radius (van der Waals): 207 pm
  • Ionization energy: 7.361 eV
  • Electron affinity: 1.05 eV
  • Oxidation states: +3
  • Standard state: Solid
  • Melting point: 2607 K
  • Boiling point: 4423 K
  • Density: 12.1 g/cm³
  • Chemical group: Transition metal
  • Year discovered: 1827

Source and provenance

Original source
pubchem.ncbi.nlm.nih.gov
Published on Koskamo by
Koskamo
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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