Pa91 – Protactinium

  • Atomic Number: 91
  • Atomic Symbol: Pa
  • Atomic Name: Protactinium
  • Atomic Mass: 231.03588
  • CPK Hex Color: 00A1FF
  • Electron Configuration: [Rn]7s2 5f2 6d1
  • Electron Negativity: 1.5
  • Atomic Radius: 243
  • Ionization Energy: 5.89
  • Electron Affinity:
  • Oxidation States: +5, +4
  • Standard State: Solid
  • Melting Point: 1845
  • Boiling Point:
  • Density: 15.37
  • Group Block: Actinide
  • Year Discovered: 1913

Periodic Table of Elements. (2022, December 23). In PubChem and the National Library of Medicine. https://pubchem.ncbi.nlm.nih.gov/periodic-table/#view=table