How many neutrons are in the isotope Cl-37?

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Multiple Choice

How many neutrons are in the isotope Cl-37?

Explanation:
To find neutrons in an isotope, subtract the number of protons from the mass number. Chlorine has 17 protons (its atomic number). The isotope notation Cl-37 has a mass number of 37. Neutrons = 37 − 17 = 20. So Cl-37 has 20 neutrons. The other numbers would require a different mass number or a different number of protons, so they don’t match chlorine’s fixed proton count with this mass number.

To find neutrons in an isotope, subtract the number of protons from the mass number. Chlorine has 17 protons (its atomic number). The isotope notation Cl-37 has a mass number of 37. Neutrons = 37 − 17 = 20. So Cl-37 has 20 neutrons. The other numbers would require a different mass number or a different number of protons, so they don’t match chlorine’s fixed proton count with this mass number.

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