Caesium-135 (Cs-135)
Identity
- Protons
- 55
- Neutrons
- 80
- Mass number
- 135
- Mass
- 134.91 ± 0.39 u
- Mass excess
- -87.582 MeV
- Spin
- 7/2+*
Stability
Half-life: 1.33 × 10⁶ years
Natural occurrence
Not found in nature
Decays to
- beta minus Ba-135
Half-life: 1.33 × 10⁶ years
Not found in nature