Antimony has two naturally occuring isotopes, Sb121Sb121 and Sb123Sb123. Sb121Sb121 has an atomic mass of 120.9038 u120.9038 u, and Sb123Sb123 has an atomic mass of 122.9042 u122.9042 u. Antimony has an average atomic mass of 121.7601 u121.7601 u. What is the percent natural abundance of each isotope?

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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.