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Naturally occurring isotopes of iron

Periodic Table--Iron. Iron has four naturally-occurring stable isotopes, 54 Fe, 56 Fe, 57 Fe and 58 Fe. The relative abundances of the Fe isotopes in nature are approximately 54 Fe (5.8%), 56 Fe (91.7%), 57 Fe (2.2%) and 58 Fe (0.3%). 60 Fe is an extinct radionuclide which had a long half-life (1.5 Myr). Much of the past work on measuring the isotopic composition of Fe has centered on

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