An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is? by Sunday | Sep 16 | Chemistry JAMB | 0 comments A. 16 B. 15 C. 31 D. 46 Correct Answer: Option B – 15 Users Also Read These:Chlorine consisting of two isotopes of mass number…How many neutrons are present in atom with mass…The nucleon number and the proton number of a…Uranium of atom number 92 and mass number 238 emits…An element Q; contains 69% of 63Q and 31% of 65Q.…