An atom 17 protons, 17 electrons and 18 neutrons has a mass number of? by Sunday | Aug 22 | Chemistry WAEC | 0 comments A. 17 B. 18 C. 34 D. 35 E. 52 Correct Answer: Option D – 35 Users Also Read These:What is the mass number of an element having 20…The nucleon number and the proton number of a…A particle that contains 11 protons; 12 neutrons and…The nucleon number and the proton number of a…Uranium of atom number 92 and mass number 238 emits…