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Isotones are defined as species having the same number of neutrons, for example, (A-Z) = 74-34 = 71-31 = 40.

1. Isotones are defined as species having the same number of neutrons, for example, (A-Z) = 74-34 = 71-31 = 40.
2. The atomic number Z represents the number of protons, while (A-Z) gives the number of neutrons.
3. For a hydrogen atom, the mass number equals the atomic number.
4. None of these statements are correct.

Correct answer: Isotones are defined as species having the same number of neutrons, for example, (A-Z) = 74-34 = 71-31 = 40.

Solution

Isotones are nuclei with the same number of neutrons. The calculation (A-Z) = 74-34 = 71-31 = 40 correctly demonstrates this concept.

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