In the Bohr model of the hydrogen atom, the electron orbits the nucleus at a fixed radius of 0.53 AA when in the ground state. This model is a violation of which scientific principle that followed?
1) the Pauli exclusion principle
2) the uncertainty principle
3) Hund's rule
4) both the Pauli exclusion principle and the uncertainty principle
5) both the Pauli exclusion principle and Hund's rule
