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:Uranium of atom number 92 and mass number 238 emits…An isotope has an atomic number of 15 and a mass…The nucleon number and the proton number of a…One mole of a compound M(HCO3)2 has a mass of 162g.…if an element X with atomic number 13 combines with…