Pm
Promethium-149
Protons (Z)
61
Neutrons (N)
88
Mass number
149
Half-Life
2.21 d
Abundance
---
Mass
148.918 u
Mass Excess
-76,064.4 keV
Spin
7/2+
Discovered
1947
Binding energy per nucleon
8,262 keV
Neutron separation energy
7,270 keV
Proton separation energy
5,945 keV
Decay Mode
- β⁻→Samarium-149100%
Decay chain
- PmPromethium-149Z 61 · N 882.21 d
- β⁻100%