by MonsieurWise
 P: 53 I know that the Bohr theory is like "Santa Claus" in Physics, but is his way of calculating radius right? Because I've made some calculations for ground state of neutral Helium and singly ionized Lithium using the Bohr's radius. What I did for Helium was to take the energy level of singly ionized Helium (negative sign) add the Coulomb repulsive energy between 2 electron (because Helium neutral has 2 electrons) in the same shell of Bohr radius. I did almost a similar thing to singly ionized Lithium. The ground state energy I've got was surprisingly close to NIST database. So can I say Bohr was right at least at the radius of the s-orbital?
 Sci Advisor P: 1,865 The Bohr radius is considered 'correct' for Hydrogen, in that his radius corresponds to the radius of maximal electron density in quantum theory (which inspired Bohr's 'theory of equivalence' between (semi-)classical and quantum results). The Bohr radius is also very nearly correct (using that definition) for Helium.
 P: 53 Wow...this makes me so happy :D. I was surprised with such a random idea I've got. thank you ^^.
P: 1,937