The Bohr Atom
The Bohr Model represents the atomic energy levels with discrete levels much like the orbits of planets around the sun. A more complete picture of the electrons would show them as probability clouds where the "orbit" is merely the most likely dista
nce from the nucleus. For most purposes of chemistry and materials science, this quantum-mechanical view of the atom is not necessary, and the simple orbital model with its discrete energy levels is quite adequate.
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