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II. Antimony (Sb) has 2 naturally occurring isotopes: Sb-121 (mass =120.9 amu; percent abundance =57.21% ) and Sb- 123 (mass =122.9 amu; percent abundance =42.79%

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II. Antimony (Sb) has 2 naturally occurring isotopes: Sb-121 (mass =120.9 amu; percent abundance =57.21% ) and Sb- 123 (mass =122.9 amu; percent abundance =42.79% ). Calculate the atomic mass of Sb

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