alleryAn atom of chlorine has atomic number Z = 17 and mass number A = 37. The number of neutrons it contains is:
A17, equal to the number of its protons
B20, equal to A minus Z
C37, equal to the mass number A
D54, equal to A plus Z
Answer & Solution
Correct answer: B. 20, equal to A minus Z
Number of neutrons N = A - Z = 37 - 17 = 20.
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