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 began to work on the problem of the atom's structure. Ernest Rutherford had recently suggested the atom had a miniature, dense nucleus surrounded by a cloud of nearly weightless electrons. There were a few problems with the model, however. For example, according to classical physics, the electrons orbiting the nucleus should lose energy until they spiral down into the center, collapsing the atom. Bohr proposed adding to the model the new idea of quanta put forth by Max Planck in 1901.