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A nucleus represented by the symbol A/Z X has:

1. A protons and (Z-A) neutrons
2. Z neutrons and (A-Z) protons
3. Z protons and (A-Z) neutrons
4. Z protons and A neutrons

Correct answer: Z protons and (A-Z) neutrons

Solution

In the symbol A/Z X, Z represents the atomic number, which is the number of protons, and A represents the mass number, which is the total number of protons and neutrons. Therefore, the number of neutrons is (A-Z).

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