According to the periodic table, chlorine has an average atomic mass of 35.453 amu.
Chlorine has an average atomic mass of 35.45 amu. Percent abundance for x therefore equals 77.5% and (1 - x) equals 0.225, or 22.5%. Chlorine-35 isotope abundance is 77.5%, whereas Chlorine-37 isotope abundance is 22.5%.
Mass spectrometry can be used to demonstrate that the ratio of naturally occurring chlorine isotope 35 to isotope 37 is 3 to 1.
A chlorine-35 atom has 18 neutrons in its nucleus (17 protons plus 18 neutrons), whereas a chlorine-37 atom has 20 neutrons (17 protons plus 20 neutrons = 37 particles in the nucleus). Isotopes of a substance are produced by adding or deleting neutrons from an atom's nucleus.
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