Iron exists in nature as a mixture of predominantly three isotopes: 54 Fe (53.94 amu), 56 Fe (55.93 amu), and 57 Fe (56.94 amu). If the most 26 26 common isotope, 56 Fe, accounts for 91.75% of iron atoms, and the 26 average atomic mass of iron is 55.85 amu, what is the percent abundance of the rarest of these three isotopes of iron?

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.