Bohr's model of hydrogen
- Bohr's model of hydrogen is based on the nonclassical assumption that electrons travel in specific shells, or orbits, around the nucleus.
- Bohr's model calculated the following energies for an electron in the shell, :
- Bohr explained the hydrogen spectrum in terms of electrons absorbing and emitting photons to change energy levels, where the photon energy is
- Bohr's model does not work for systems with more than one electron.
The planetary model of the atom
- Where are the electrons, and what are they doing?
- If the electrons are orbiting the nucleus, why don’t they fall into the nucleus as predicted by classical physics?
- How is the internal structure of the atom related to the discrete emission lines produced by excited elements?