Notable Isotopes 
26Al [13 neutrons]
Abundance: synthetic
Half life: 7.17 x 105 years [ beta+ ]
Decay Energy: 1.17 MeVDecays to 26Mg.
Half life: 7.17 x 105 years [ Electron Capture ]
Decay Energy: ? MeVDecays to 26Mg.
Half life: 7.17 x 105 years [ Gamma Radiation ]
Decay Energy: 1.8086 MeVDecays to ?.
| Meteorite research has also shown that 26Al was relatively abundant at the time of formation of our planetary system. Most meteoriticists believe that the energy released by the decay of 26Al was responsible for the melting and differentiation of some asteroids after their formation 4.55 billion years ago. |
27Al [14 neutrons]Abundance: 100%
Stable with 14 neutrons