An atom of chlorine is represented as $^{35}_{17}\text{Cl}$. How many neutrons does it contain?
A35
B18CORRECT
C17
D52
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Toaster Teacher
Why the answer is B, and why the others tempt you.
Neutrons = mass number − atomic number = 35 − 17 = 18. The value 17 is the number of protons (and electrons), and 52 comes from adding the two numbers.
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