How binding energy and orbital radius of the innermost electron vary with atomic no. Hi everyone, This is my first post on here, hope I'm doing everything as I should, let me know if I'm not! So here's the question I'm working on: http://img855.imageshack.us/img855/181/physquestion.jpg [Broken] For one thing, I don't know what the 'm' or the 'n' stand for. I think the rest are constants, except 'e' which is the charge on the electron. Am I correct in thinking that the 'h' is Planck's constant? I think these big messy equations are just frying my brain, and I can't see the answer at all. Any help will be much appreciated!