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Thorium
(Th)
120
28183218102
Th
Category
Actinoid
Series
actinide
Relative atomic mass
232.03806
Density
11.72
Melting point (°C)
1860
Boiling point (°C)
3977
Electronegativity (Pauling)
1.3
Half-life
1.4×10¹⁰ y
Discovery year
1917
Discovered by
Ernest Rutherford
Electrons: 90
Protons: 90
Neutrons: 142

Wikipedia

Wikipedia
Decay chain
  1. Th-232(1.4×10¹⁰ y)
    α decay
  2. Ra-228(5.75 y)
    β⁻ decay
  3. Ac-228(6.15 h)
    β⁻ decay
  4. Th-228(1.91 y)
    α decay
  5. Ra-224(3.66 d)
    α decay
  6. Rn-220(55.6 s)
    α decay
  7. Po-216(0.145 s)
    α decay
  8. Pb-212(10.6 h)
    β⁻ decay
  9. Bi-212(60.6 min)
    α decay
  10. Tl-208(3.05 min)
    β⁻ decay
  11. Pb-208(stable)stable
created by @lukaswyss
Thorium (Th) – Element 90