Cs

Caesium-121

Protons (Z)

55

Neutrons (N)

66

Mass number

121

Half-Life

2.58 m

Abundance

---

Mass

120.917 u

Mass Excess

-77,102.0 keV

Spin

3/2+

Discovered

1969

Binding energy per nucleon

8,353 keV

Neutron separation energy

11,284 keV

Proton separation energy

2,219 keV

Decay Mode

β⁺Xenon-121100%

Decay chain

Caesium-121Z 55 · N 662.58 m
β⁺100%
β⁺100%
β⁺100%
β⁺100%