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Atoms of the same element with different mass numbers are:

AIsotones
BIsotopes
CIsobars
DIsomers
Answer & Solution
Correct answer: B. Isotopes
1. They share the same atomic number. 2. Their nuclei hold different neutron counts. 3. They are isotopes. _Source: syllabus Science, Ch 4 'Structure of the Atom'_
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