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:The nucleon and proton numbers of a neutral atom of…What is the mass number of an element having 20…An isotope has an atomic number of 15 and a mass…How many electrons will be found in the nucleus of…The nucleon number and the proton number of a…