Isotopes have the SAME number of:
ANeutrons only (different protons)
BProtons + Neutrons + Electrons (identical)
CProtons (different neutron number)
DElectrons in inner shells only
Answer & Solution
Correct answer: C. Protons (different neutron number)
ISOTOPES = same atomic number Z (same protons), different mass number A (different neutrons). Example: ¹²C, ¹³C, ¹⁴C all have 6 protons but 6, 7, 8 neutrons. ISOBARS have same A, different Z.
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