In the Bohr Model, the electron is treated as a particle in fixed orbits around the nucleus. In the Quantum Mechanical Model, the electron is treated mathematically as a wave. It therefore required three coordinates, or three quantum numbers, to describe the distribution of electrons in the atom.
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Answer:
In the Bohr Model, the electron is treated as a particle in fixed orbits around the nucleus. In the Quantum Mechanical Model, the electron is treated mathematically as a wave. It therefore required three coordinates, or three quantum numbers, to describe the distribution of electrons in the atom.