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Atoms of the same element with different mass numbers (i.e., different numbers of neutrons) are called:
AIons
BIsotopes
CIsobars
DAtoms
Answer & Solution
Correct answer: B. Isotopes
Isotopes: same atomic number (same element) but different mass numbers (different neutron counts). Examples: hydrogen has three isotopes — protium (¹H, no neutrons), deuterium (²H, 1 neutron), tritium (³H, 2 neutrons). All behave chemically the same.
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