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Radium
(Ra)
020
2818321882
Ra
Category
Alkaline earth
Relative atomic mass
226
Density
5
Melting point (°C)
962
Boiling point (°C)
1946
Electronegativity (Pauling)
1.5
Half-life
1600 y
Discovery year
1898
Discovered by
Marie Curie
Electrons: 88
Protons: 88
Neutrons: 138

Wikipedia

Wikipedia
Decay chain
  1. Ra-226(1600 y)
    α decay
  2. Rn-222(3.82 d)
    α decay
  3. Po-218(3.10 min)
    α decay
  4. Pb-214(26.8 min)
    β⁻ decay
  5. Bi-214(19.9 min)
    β⁻ decay
  6. Po-214(164 µs)
    α decay
  7. Pb-210(22.2 y)
    β⁻ decay
  8. Bi-210(5.01 d)
    β⁻ decay
  9. Po-210(138.4 d)
    α decay
  10. Pb-206(stable)stable
created by @lukaswyss
Radium (Ra) – Element 88