An atom 17 protons, 17 electrons and 18 neutrons has a mass number of? By: Sunday|Published on: Aug 22|Categories: Chemistry WAEC| 0 comments A. 17 B. 18 C. 34 D. 35 E. 52 Correct Answer: Option D – 35 Users Also Read These:How many electrons will be found in the nucleus of…How many neutrons are present in atom with mass…The nucleon number and the proton number of a…How many protons, neutrons and electrons…The nucleon number and the proton number of a…SEE ALSO Which of the following molecules has a linear shape?