List the number of protons, neutrons, and nucleons (protons + neutrons), in that order, for an isotope with the symbol:

Question

Quizplus · Accepted Answer

The atomic number (number of protons) is 55, which is given by the subscript in the symbol. The number of nucleons can be calculated by adding the number of protons and neutrons, which is 137. To find the number of neutrons, we subtract the atomic number from the number of nucleons, giving us 82. Therefore, the correct option is (C) 55, 82, 137.

List the Number of Protons, Neutrons, and Nucleons (Protons