A) atomic number
B) mass number
C) nucleons
D) none of these
Correct Answer: A
Solution :
Isotope are atoms of same elements having same atomic number but different mass number or they have same number of protons but different number of neutrons Atomic number = number of protons Mass number = number of (protons + neutrons) nucleons = number of (protons + neutrons) e.g., \[_{1}{{H}^{1}}{{,}_{1}}{{H}^{2}}{{,}_{1}}{{H}^{3}},\]are isotopes of hydrogen because they has same atomic number or same number of electron.
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