Hi folks, I am reading "Purcell Electricity and Magnetism" and in the problem 1.77 he says: " Imagine a sphere of radius a filled with negative charge of uniform density, the total charge being equivalent to that of two electrons. Imbed in this jelly of negative charge two protons, and assume that, in spite of their presence, the negative charge distribution remains uniform. Where must the protons be located so that the force on each of them is zero? (This is a surprisingly realistic caricature of a hydrogen molecule; the magic that keeps the electron cloud in the molecule from collapsing around the protons is explained by quantum mechanics!" My question is, Why is it a good caricature of the Hydrogen atom? I mean he says that statement but then does not justify it, I don't see him talking about energy levels or density of probability distributions. So does anybody know where can I read about it? What properties of an hydrogen atom could I calculate using the jelly model? It looks very interesting. Thanks!