The correct statement is Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.
In a simple way to explain, Isotopes are species that have the same atomic number and mass number.
In this case, we can say that the correct statement is proton number of isotopes of an element is same.
See more about Isotopes at brainly.com/question/11680817
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