Iron has four stable isotopes: 54 Fe (5.845% of natural iron), 56 Fe (91.754%), 57 Fe (2.119%) and 58 Fe (0.282%). artificial isotopes have also been created. Of these stable isotopes, only 57 Fe has a nuclear spin (− 1 ⁄ 2).The nuclide 54 Fe theoretically can undergo double electron capture to 54 Cr, but the process has never been observed and only a lower limit on the half-life …
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