sodium-24
Definition: There are 21 isotopes of sodium (11Na), ranging from 17Na to 39Na, and two isomers (22mNa and 24mNa). 23Na is the only stable (and the only primordial) isotope. It is considered a monoisotopic element and it has a standard atomic weight of 22.98976928(2). Sodium has two radioactive cosmogenic isotopes (22Na, with a half-life of 2.6019(6) years; and 24Na, with a half-life of 14.9560(15) h). With the exception of those two isotopes, all other isotopes have half-lives under a minute, most under a second. The shortest-lived is 18Na, with a half-life of 1.3(4)×10−21 seconds.
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