Isotopes_of_aluminium
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Aluminium or aluminum (13Al) has one stable isotope, 27Al, comprising all natural aluminium. The radioactive 26Al, with half-life 717,000 years, occurs in traces from cosmic-ray spallation of argon in the atmosphere. Other than 26Al, there are 22 known synthetic radioisotopes from 20Al to 43Al, and 4 known metastable states; all have half-lives under 7 minutes, most under a second. 26Al is an exti
* Calculated from Wikipedia data.
Accuracy is not guaranteed.
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