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Antimony has two naturally occuring isotopes, 121 Sb and 123 Sb. 121 Sb has an atomic mass of 120.9038 u, and 123Sb has an

Antimony has two naturally occuring isotopes, 121 Sb and 123 Sb. 121 Sb has an atomic mass of 120.9038 u, and 123Sb has an atomic mass of 122.9042 u. Antimony has an average atomic mass of 121.7601 u. What is the percent natural abundance of each isotope? 121 Sb: 123Sb: %

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