Basic particle descriptions. atom – the fundamental unit of which elements are composed (neutral: p + = e - ; n 0 varies) ion – atom that has lost or gained electrons and carries a charge ( p + ≠ e - ; n 0 same)
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Bromine has two isotopes with the first having a mass of 78.91 amu and occupying 50.69% and the second isotope having a mass of 80.91 amu and occupying 49.31%. What is the average atomic mass of bromine?
0.5069(78.91 amu) + 0.4931(80.91 amu) =
79.90 amu = 79.90 g/mol
Verify the atomic mass of chlorine using this data for its two isotopes:
chlorine-35 = 34.96 amu;
percent abundance = 75.77%
chlorine-37 = 36.96 amu
percent abundance = 24.23%
0.7577(34.96 amu) + 0.2423(36.96 amu) =
35.44 amu = 35.44 g/mol