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