Why is the atomic mass of chlorine quoted on the Periodic Table NON-INTEGRAL?

1 Answer
anor277
Dec 1, 2015

All chlorine nuclei have 17 protons in their nucleus. Chlorine nuclei contain differing numbers of neutrons. The weighted average of the nuclei sum to 35.45 amu.

Explanation:

Isotopic breakdown of chlorine: 35Cl, 75.77%; 37Cl, 24.27%. These are the major isotopes and their weighted average is the quoted atomic mass.

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