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Tantalum

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

Original source

Tantalum (Ta) is chemical element 73, a transition metal in group 5, period 6 (PubChem).

  • Atomic number: 73
  • Symbol: Ta
  • Group: 5
  • Period: 6
  • Atomic mass: 180.9479 u
  • Electron configuration: [Xe]6s2 4f14 5d3
  • Electronegativity (Pauling scale): 1.5
  • Atomic radius (van der Waals): 217 pm
  • Ionization energy: 7.89 eV
  • Electron affinity: 0.322 eV
  • Oxidation states: +5
  • Standard state: Solid
  • Melting point: 3290 K
  • Boiling point: 5731 K
  • Density: 16.4 g/cm³
  • Chemical group: Transition metal
  • Year discovered: 1802

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