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:The nucleon number and the proton number of a…if an element X with atomic number 13 combines with…The number of protons in an element increased by one…An isotope has an atomic number of 15 and a mass…Allotropes of an element differ in their?