Discussion
Isotopes are the elements having :
Answer: B
Isotopes have the same Z but different N and A.
Z is the atomic number (number of protons), N the number of neutrons and A the mass number (Z + N). Isotopes are atoms of the same element, so they share Z, but they contain different numbers of neutrons and therefore have different mass numbers: \(^{12}\)C and \(^{14}\)C, or \(^{16}\)O and \(^{18}\)O.
Atoms with the same N but different Z are isotones, atoms with the same A but different Z are isobars, and atoms with the same N, Z and A are simply identical nuclides.
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