Iodine-129 (I-129)
Identity
- Protons
- 53
- Neutrons
- 76
- Mass number
- 129
- Mass
- 128.9 ± 3.4 u
- Mass excess
- -88.507 MeV
- Spin
- 7/2+*
Stability
Half-life: 1.61 × 10⁷ years
Natural occurrence
Not found in nature
Decays to
- beta minus Xe-129
Half-life: 1.61 × 10⁷ years
Not found in nature