Therefore, electrons cannot be arranged at random, but they must have fixed levels of energy within each type of atom. Bohr's 'solar system' model of the atom is the way that most people think ...

collapsing the atom. Bohr proposed adding to the model the new idea of quanta put forth by Max Planck in 1901. That way, electrons existed at set levels of energy, that is, at fixed distances from ...

In 1912 Bohr joined Rutherford. He realized that Rutherford's model ... energy levels (orbits) in a quantum fashion, that is, without ever existing in an in-between state. Thus when an atom ...

This energy level model shows two electrons on the first energy level and six electrons on the second energy level. Since this atom has a total of eight electrons, it also has eight protons. The atom ...