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Neptunium
(Np)
2818322292
Np
Category
Actinoid
Series
actinide
Relative atomic mass
237.0482
Density
20.45
Melting point (°C)
610
Boiling point (°C)
3100
Electronegativity (Pauling)
1.36
Half-life
2.14×10⁶ y
Discovery year
1940
Discovered by
Glenn T. Seaborg
Electrons: 93
Protons: 93
Neutrons: 144

Wikipedia

Wikipedia
Decay chain
  1. Np-237(2.14×10⁶ y)
    α decay
  2. Pa-233(27.0 d)
    β⁻ decay
  3. U-233(159,200 y)
    α decay
  4. Th-229(7340 y)
    α decay
  5. Ra-225(14.9 d)
    β⁻ decay
  6. Ac-225(10.0 d)
    α decay
  7. Fr-221(4.80 min)
    α decay
  8. At-217(32.3 ms)
    α decay
  9. Bi-213(45.6 min)
    β⁻ decay
  10. Po-213(3.72 µs)
    α decay
  11. Pb-209(3.25 h)
    β⁻ decay
  12. Bi-209(stable)stable
created by @lukaswyss
Neptunium (Np) – Element 93