A. Protons in the nucleus
B. Electrons outside the nucleus
C. Neutrons in the nucleus
D. Protons and neutrons in the nucleus
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Answer: C. Neutrons in the nucleus The existence of isotopes is due to the difference in the number of neutrons in the nucleus.
Answer: C. Neutrons in the nucleus
See lessThe existence of isotopes is due to the difference in the number of neutrons in the nucleus.