What is the atomic symbol for isotopes with the following characteristics: 15 protons and 16 neutrons?
If there are 15 protons, 15 nuclear particles of unit positive charge, then
But we are not finished. Along with the 15 defining protons, there are also 16 neutrally charged, massive nuclear particles, 16 neutrons, and the protons and neutrons together determine the atomic mass. The isotope is thus