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:An atom 17 protons, 17 electrons and 18 neutrons has…Chlorine consisting of two isotope of mass number 35…What is the mass number of an element if its atom…How many neutrons are present in atom with mass…An isotope has an atomic number of 15 and a mass…