An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is? by Sunday | Oct 10 | Chemistry JAMB | 0 comments A. 16 B. 15 C. 46 D. 31 Correct Answer: Option B – 15 Users Also Read These:Chlorine consisting of two isotopes of mass number…How many protons does 40//20Ca contain?An element having the atomic number 17 will resemble…What is the mass number of an element if its atom…An atom 17 protons, 17 electrons and 18 neutrons has…