alleryAtoms of the SAME element with DIFFERENT mass numbers are called:
AIsobars (same A, different Z)
BAllotropes (different forms of same element)
CIsotopes (same Z, different A)
DCations (positively charged ions)
Answer & Solution
Correct answer: C. Isotopes (same Z, different A)
Isotopes share the same atomic number Z (so they ARE the same element) but have different mass numbers A. Example: ¹H, ²H, ³H all have Z = 1 but A = 1, 2, 3.
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