I would guess two lol but that wasn't on the multiple choice. I'm lost.
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They are both stable isotopes of Chlorine.
35Cl has 17 protons and 18 neutrons in the nucleus. 37Cl has 2 more neutrons in its nucleus.
35Cl has 17 protons and 18 neutrons in the nucleus. 37Cl has 2 more neutrons in its nucleus.