Lesson: Chapter 3 — The Structure of Matter
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How many neutrons are there in an atom of 3717Cl?
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20. Neutrons = A − Z = 37 − 17 = 20.
17 is the proton count, and the electron count too — it is the same for both chlorine isotopes, which is why they are both chlorine. The other isotope, 3517Cl, has 35 − 17 = 18 neutrons.
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