Bio-Physics (M.Phil./Ph.D.) 2016 Panjab University Entrance Exam With Answers

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19.

Isotopes are the atoms with the same no of:

A: Protons and varying no. of neutrons
B: Neutrons and varying no. of protons
C: Protons and varying no. of electrons
D: Electrons and varying no. of neutrons

The answer is: A

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