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:The atomic number of an isotope of hydrogen is equal…What is the mass number of an element if its atom…How many neutrons are present in atom with mass…How many protons does 40//20Ca contain?An element having the atomic number 17 will resemble…