What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons? by Sunday | May 13 | Chemistry WAEC | 0 comments A. 32 B. 22 C. 20 D. 10 Correct Answer: Option B B. 22 Users Also Read These:How many electrons will be found in the nucleus of…What is the mass number of an element having 20…How many protons, neutrons and electrons…A particle that contains 11 protons; 12 neutrons and…An atom W has 17 electrons and 18 neutrons. Which of…