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Protactinium
(Pa)
2818322092
Pa
Category
Actinoid
Series
actinide
Relative atomic mass
231.03588
Density
15.37
Melting point (°C)
1845
Boiling point (°C)
3977
Electronegativity (Pauling)
1.3
Half-life
32,760 y
Discovery year
1917
Discovered by
Ernest Rutherford
Electrons: 91
Protons: 91
Neutrons: 140

Wikipedia

Wikipedia
Decay chain
  1. Pa-231(32,760 y)
    α decay
  2. Ac-227(21.8 y)
    β⁻ decay
  3. Th-227(18.7 d)
    α decay
  4. Ra-223(11.4 d)
    α decay
  5. Rn-219(3.96 s)
    α decay
  6. Po-215(1.78 ms)
    α decay
  7. Pb-211(36.1 min)
    β⁻ decay
  8. Bi-211(2.14 min)
    α decay
  9. Tl-207(4.77 min)
    β⁻ decay
  10. Pb-207(stable)stable
created by @lukaswyss
Protactinium (Pa) – Element 91