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Naturally occurring scandium is composed of one stable isotope, Sc. Twenty-five radioisotopes have been characterized, with the most stable being Sc with a half-life of 83.8 days, Sc with a half-life of 3.35 days, and Sc with a half-life of 43.7 hours and Sc with a half-life of 3.97 hours. All the remaining isotopes have half-lives that are less than four hours, and the majority of these have half-lives that are less than two minutes, the least stable being proton unbound Sc with a half-life shorter than 300 nanoseconds. This element also has 13 meta states with the most stable being Sc.
The isotopes of scandium range in atomic weight from 38 u to 62 u. The primary decay mode at masses lower than the only stable isotope, Sc, is beta-plus or electron capture, and the primary mode at masses above it is beta-minus. The primary decay products at atomic weights below Sc are calcium isotopes and the primary products from higher atomic weights are titanium isotopes.