An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is? By: Sunday|Published on: Oct 10|Categories: 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…An element having the atomic number 17 will resemble…Neutral atoms of neon with atomic number 10 have the…The atomic number of chlorine is 17. What is the…Chlorine consisting of two isotope of mass number 35…SEE ALSO Benzene reacts with hydrogen in the presence of nickel catalyst at 180°C to give?