La

Lanthanum-140

Protons (Z)

57

Neutrons (N)

83

Mass number

140

Half-Life

1.68 d

Abundance

---

Mass

139.909 u

Mass Excess

-84,312.1 keV

Spin

3-

Discovered

1935

Binding energy per nucleon

8,355 keV

Neutron separation energy

5,161 keV

Proton separation energy

6,687 keV

Decay Mode

β⁻Cerium-140100%

Decay chain

Lanthanum-140Z 57 · N 831.68 d
β⁻100%