1 Schedule for the concerts in Regina is refreshed on a regular basis. 2  Regina is really one of the best areas for concert tours in America.
1 Niels Bohr suggested that electrons in an atom were restricted to specific orbits around the atoms nucleus. 2  Bohr argued that an electron in a given orbit has a constant energy, thus he named these orbits energy level.
Bohr's model was the first to incorporate quantum theory, and hypothesized that since electrons can only have finite, discrete energy states, they only inhabit fixed distances from the nucleus. These distances were arranged into energy levels.