Isotopes of an element have:

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A The same mass number but different atomic numbers
B The same atomic number but different mass numbers
C The same number of neutrons
D Different chemical properties

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Answer: B. The same atomic number but different mass numbers

Answer: B. Same atomic number but different mass numbers
Explanation: Isotopes are atoms of the same element (same number of protons, so same atomic number) with different numbers of neutrons, giving different mass numbers (e.g., Carbon-12 and Carbon-14).

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Isotopes of an element have:

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