I have a conceptual problem. 1. The problem statement, all variables and given/known data I was given a charge distribution for an electron cloud of a hydrogen atom in the ground state - ignoring the nucleus. 2. Relevant equations charge density: ρ=charge of electron/(pi*Bohr radius^3)*exp(-2r/Bohr radius) 3. The attempt at a solution Whenever I integrate over the volume of the sphere to find the enclosed charge, I got a value other than the charge of an electron. Why isn't the enclosed charge equal to the charge of an electron? What concept am I missing here? The charge density function comes from quantum mechanics. Is there some weird quantum effect there that is taken into account?