Naturally-occurring scandium (21Sc) is composed of one stable isotope, 45Sc. Twenty-six radioisotopes have been characterized from 37Sc to 63Sc, with the most stable being 46Sc with a half-life of 83.76 days, 47Sc with a half-life of 3.3492 days, 48Sc at 43.67 hours, 44Sc at 4.042 hours, and 43Sc at 3.891 hours.
Naturally-occurring scandium (21Sc) is composed of one stable isotope, 45Sc. Twenty-six radioisotopes have been characterized from 37Sc to 63Sc, with the most stable being 46Sc with a half-life of 83.76 days, 47Sc with a half-life of 3.3492 days, 48Sc at 43.67 hours, 44Sc at 4.042 hours, and 43Sc at 3.891 hours.
Source: Wikipedia "Isotopes of scandium" · CC BY-SA 4.0
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