Fr

Francium-226

Protons (Z)

87

Neutrons (N)

139

Mass number

226

Half-Life

48.5 s

Abundance

---

Mass

226.03 u

Mass Excess

27,521.0 keV

Spin

1-

Discovered

1969

Binding energy per nucleon

7,648 keV

Neutron separation energy

4,371 keV

Proton separation energy

6,302 keV

Decay Mode

β⁻Radium-226100%

Decay chain

Francium-226Z 87 · N 13948.5 s
β⁻100%
α~100%
α100%
α99.98%
β⁻100%
β⁻99.976%
α100%
β⁻~100%
β⁻~100%
α100%