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:An element of nucleon number P and atomic number Q…The number of protons in an element increased by one…The mass of an element is 27 and its atomic number…If the relative molecular mass of an element is not…If the relative molecular mass of an element is not…