Pa
Protactinium-222
Protons (Z)
91
Neutrons (N)
131
Mass number
222
Half-Life
3.8 ms
Abundance
---
Mass
222.024 u
Mass Excess
22,060.0 keV
Spin
(1-)
Discovered
1970
Binding energy per nucleon
7,651 keV
Neutron separation energy
6,381 keV
Proton separation energy
2,169 keV
Decay Mode
- α→Actinium-218100%
Decay chain
- PaProtactinium-222Z 91 · N 1313.8 ms
- α100%
- α100%
- α100%
- β⁺99.825%
- α100%