Ugh! I hate this stuff. Convoluted rules that exist without explanation. Bohr models and shells energy levels and nucleon numbers. The number of neutrons, deducible by an indecipherable notation system, based on the ability to perform quick subtraction. Well the dyscalculiatic redhead is frustrated and mad and disinterested.
What the fuck was I thinking?
Whatever, I made myself feel better and bought another book: