Fr

Francium-204n

Protons (Z)

87

Neutrons (N)

117

Mass number

204

Half-Life

1.65 s

Abundance

---

Mass

204.001 u

Mass Excess

934.0 keV

Spin

10-

Discovered

1992

Binding energy per nucleon

7,733 keV

Neutron separation energy

8,013 keV

Proton separation energy

171 keV

Decay Mode

Decay chain

Francium-204Z 87 · N 1171.65 s
α53%
α52%
β⁺~100%
β⁺~100%
β⁺100%