The Elements Table

The Interactive Periodic Table of Elements

  • 91 Pa Protactinium 231.036
  • 91 Pa Protactinium 231.036
  • 91 Pa Protactinium 231.036
  • Vital Element Stats

  • Name: Protactinium
  • Symbol: Pa
  • Weight: 231.036
  • Family: Actinide
  • Group: 91
  • Period: 4300
  • Composition

  • Electrons: 91
  • Protons: 91
  • Neutrons: ~140
  • Measurements

  • Density: 15.40 g/mL
  • Miscellaneous Facts

  • Discovered: 1919
  • Melting Point: 1845 o C , 3353 o F , 2118.15 o Kelvin
  • Boiling Point: 4300 o C , 7772 o F , 4573.15 o Kelvin
  • Cost: N/A