An element and its isotope only differ in the number of? by Sunday | Nov 3 | Physics JAMB | 0 comments A. protons B. electrons C. ions D. neutrons Correct Answer: Option D – neutrons Users Also Read These:if an element X with atomic number 13 combines with…If the relative molecular mass of an element is not…The mass of an element is 27 and its atomic number…If the relative molecular mass of an element is not…An isotope has an atomic number of 15 and a mass…