Home ยป An atom has mass number 37 and atomic number 17. Find the number of protons Atomic Structure MCQs An atom has mass number 37 and atomic number 17. Find the number of protons January 8, 2022 27 Views Q. An atom has mass number 37 and atomic number 17. Find the number of protons A. 21 B. 22 C. 17 D. 20 Answer: 17