The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element ?
Correct answer: B. A - Z
- A. A + Z
- B. A - Z
- C. A
- D. Z
Explanation
The mass number A represents protons plus neutrons, whereas the atomic number Z represents protons. Subtracting gives the neutron count, N = A − Z.
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