Which one of the following is the average atomic mass of chlorine atom ?
35.9 u
35.5 u
35.0 u
37.0 u
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This question was previously asked in
UPSC CAPF – 2020
Chlorine occurs naturally as a mixture of two main isotopes: chlorine-35 (³⁵Cl) and chlorine-37 (³⁷Cl). Their approximate natural abundances are about 75% for ³⁵Cl (mass ≈ 34.97 u) and 25% for ³⁷Cl (mass ≈ 36.97 u). The average atomic mass is a weighted average of the masses of its isotopes based on their natural abundance.