While the most common isotope of nitrogen has a mass number of 14 (nitrogen-14), a radioactive
isotope of nitrogen has a mass number of 13 (nitrogen-13). Nitrogen-13 is used in PET (positron
emission tomography) scans by physicians to monitor brain activity and diagnose dementia. For
each isotope, give the following information: (a) the number of protons; (b) the number of neutrons;
(c) the number of electrons in the neutral atom; and (d) the group number.