"Isotopes" are defined as atoms of the same element that share the same atomic number () but differ in their mass number (). What is the fundamental structural reason for this difference?

Question

"Isotopes" are defined as atoms of the same element that share the same atomic number ($Z$) but differ in their mass number ($A$). What is the fundamental structural reason for this difference?

Prashant Kotian · Accepted Answer

Correct answer: C. Isotopes are atoms of the same element, meaning they have identical numbers of protons (and electrons in neutral atoms). They differ solely in the number of neutrons residing in the nucleus.

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