Al
Aluminium-21
Protons (Z)
13
Neutrons (N)
8
Mass number
21
Half-Life
---
Abundance
---
Mass
21.029 u
Mass Excess
27,090.0 keV
Spin
(5/2+)
Discovered
---
Binding energy per nucleon
6,297 keV
Neutron separation energy
---
Proton separation energy
-2,323 keV
Decay Mode
- p→Magnesium-20
Decay chain
- AlAluminium-21Z 13 · N 8Unknown
- p
- β⁺69.7%
- β⁺75%