Bohr's Helium Atom & Explanation of Line Spectrum

As a long experience of chemistry teaching I understand what's the difficulties among general school-students to cope with physics & chemistry. This prompted me to design these animations. After a long run of 100 yrs, Bohr's Atomic Model successfully explained the line spectra of one electron system like H-atom, He-ion, etc.The calculated value of 1st Bohr-orbit according to Bohr's model is well agreement with the prediction by modern wave mechanics.