Given the Atomic M, how to do I find the #of Protons & Neutrons?

Protons+Neutrons=Atomic M. Protons and electrons are the same in quantity, unless it's an isotope. Take the atomic number (the number to the top left of the chemical symbol) and that's the number of Electrons, and therefore Protons. Then, take the number of Protons and subtract it from the atomic m, and you have the number of neutrons