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Rutherford was responsible for discarding the plum pudding model of the atom, which was a paradigm shift in itself. He replaced this model with the planetary-like model of a nucleus with its orbiting electrons. His idea was that the orbiting electrons emitted radiation, something that Bohr added to (Indiana University).
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Shortly after Rutherford's Atomic Model was proposed, Bohr started working in his Manchester laboratory where he began his extensive work on atomic radiation. His studies, which resulted in his contribution, were based off of Rutherford's Atomic Model and borrowed from the well known Quantum Theory (Nobel Prize).
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Niels Bohr expressed his own model of the atom. Previously, Rutherford stated that electrons moved on a curved path radiating energy, which Bohr decided was unstable. In its place, he came up with the idea that "electrons move in orbits of fixed size and energy" (Oregon). This is the atomic model in which electrons orbit the nucleus in a steady state that we see today. Here is a video by Youtube channel Physics Explained detailing Bohr's discovery:
https://www.youtube.com/watch?v=_Gt7mo8SNkA -
Bohr applied the idea that radiation only occurred when an atom's electrons either ascended or descended to a different orbit within the atom (MSU). This was different from Rutherford's idea in reference to the energy levels of the electrons.
