Home ยป What will be the number of neutrons in an atom having atomic number 35 and mass number 80? Atomic Structure MCQs What will be the number of neutrons in an atom having atomic number 35 and mass number 80? January 8, 2022 1 View Q. What will be the number of neutrons in an atom having atomic number 35 and mass number 80? A. 35 B. 45 C. 55 D. 80 Answer: 45