An element and its isotope only differ in the number of? By: Sunday|Published on: Nov 3|Categories: Physics JAMB| 0 comments A. protons B. electrons C. ions D. neutrons Correct Answer: Option D – neutrons Users Also Read These:The number of protons in an element increased by one…An isotope has an atomic number of 15 and a mass…The nucleon number and the proton number of a…If the relative molecular mass of an element is not…if an element X with atomic number 13 combines with…SEE ALSO A bat emits a sound wave at a speed of 1650.0ms−¹ and receives the echoes 0.15s later. Calculate the distance of the bat from the reflector.