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Francium
(Fr)
2818321881
Fr
Category
Alkali metal
Relative atomic mass
223
Density
1.87
Melting point (°C)
27
Boiling point (°C)
677
Electronegativity (Pauling)
0.7
Half-life
22.0 min
Discovery year
1939
Discovered by
Marie Curie
Electrons: 87
Protons: 87
Neutrons: 136

Wikipedia

Wikipedia
Decay chain
  1. Fr-223(22.0 min)
    β⁻ decay
  2. Ra-223(11.4 d)
    α decay
  3. Rn-219(3.96 s)
    α decay
  4. Po-215(1.78 ms)
    α decay
  5. Pb-211(36.1 min)
    β⁻ decay
  6. Bi-211(2.14 min)
    α decay
  7. Tl-207(4.77 min)
    β⁻ decay
  8. Pb-207(stable)stable
created by @lukaswyss
Francium (Fr) – Element 87