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How many electrons, protons and neutrons does chlorine have? A: The chemical element chlorine has 17 electrons, 17 protons and 18 neutrons. An atom, which is the fundamental unit of an element, contains an equal number ... Full Answer >
So for the chlorine example, where there are only two naturally occurring isotopes, you would use the following. 75.58 percent of chlorine atoms are chlorine-35 and 24.22 percent of chlorine atoms are chlorine-37. The average atomic mass = 0.7578 x 34.9689 + 0.2422 x 36.9659 = 35.453 amu.Source(s):pisgahchemist Â· 7 years ago.5.58 percent of chlorine atoms are chlorine-35 and 24.22 percent of chlorine atoms are chlorine-37. The average atomic mass = 0.7578 x 34.9689 + 0.2422 x 36.9659 = 35.453 amu. Source(s): pisgahchemist Â· 7 years ago.