Th
Thorium-221
Protons (Z)
90
Neutrons (N)
131
Mass number
221
Half-Life
1.75 ms
Abundance
---
Mass
221.018 u
Mass Excess
16,940.0 keV
Spin
(7/2+)
Discovered
1970
Binding energy per nucleon
7,676 keV
Neutron separation energy
5,821 keV
Proton separation energy
4,093 keV
Decay Mode
- α→Radium-217100%
Decay chain
- ThThorium-221Z 90 · N 1311.75 ms
- α100%
- α100%
- α100%
- α99.546%
- EC100%