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Atomic Model: Timeline

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1 Atomic Model: Timeline
Rutherford Democritus Thompson Bohr Chadwick Schrodinger Dalton

2 Bohr Model Bohr's theory begins with Rutherford's picture of an atom as a nucleus surrounded by electrons moving in circular orbits. In his theory, Bohr made a number of assumptions and combined the new quantum ideas of Planck and Einstein with the traditional description of a particle in uniform circular motion. Bohr’s Postulates: 1. Electrons in stationary orbits do not radiate. 2. The atom radiates energy as photon when it transition to lower energy.

3 Orbital Radius

4 Energy-Level diagram for Hydrogen

5 Wavelengths of Balmer Series

6

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