Answer
a. 14 protons and 14 neutrons.
b. 37 protons and 48 neutrons.
c. 81 protons and 124 neutrons.
Work Step by Step
The pre-superscript is the mass number A, the total number of protons and neutrons.
The pre-subscript is Z, the number of protons.
Number of neutrons N = A-Z.