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- The Bohr model shows that the electrons in atoms are in orbits of differing energy around the nucleus (think of planets orbiting around the sun).
- Bohr used the term energy levels (or shells) to describe these orbits of differing energy. He said that the energy of an electron is quantized, meaning electrons can have one energy level or another but nothing in between.
- The energy level an electron normally occupies is called its ground state. But it can move to a higher-energy, less-stable level, or shell, by absorbing energy. This higher-energy, the less-stable state is called the electron’s excited state.
- After it’s done being excited, the electron can return to its original ground state by releasing the energy it has absorbed, as shown in the diagram below.
- Sometimes the energy released by electrons occupies the portion of the electromagnetic spectrum (the range of wavelengths of energy) that humans detect as visible light. Slight variations in the amount of the energy are seen as the light of different colors.

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-“Atomic Structure: The Bohr Model.” Dummies. Accessed September 14, 2017. http://www.dummies.com/education/science/chemistry/atomic-structure-the-bohr-model/.

-“How Does Bohr’s Model of the Atom Differ from Rutherford’s? | Socratic.” Socratic.org. Accessed September 14, 2017. https://socratic.org/questions/how-does-bohr-s-model-of-the-atom-differ-from-rutherford-s.

-“What Does Bohr’s Model of the Atom Look like? | Socratic.” Socratic.org. Accessed September 14, 2017. https://socratic.org/questions/what-does-bohr-s-model-of-the-atom-look-like.

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It looks like the Sun with the electrons revolving around it like planets in their orbits.

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- Niels Bohr was born in Copenhagen and educated at Copenhagen University. - Bohr was one of the first to finalize a model that demonstrated electrons orbiting the nucleus of an atom.
- Bohr was the first to theorize that an electron could move from a higher orbit to a lower one, and that in the process, energy was emitted.

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How the Bohr Model is Different from the Rutherford Model

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How the Bohr Model is Different from the Rutherford Model

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Rutherford came up with a new model that had never been seen before, because it had a nucleus. Bohr realized that the electrons would kind of like dance around the atom, whereas Bohr also said:
- Electrons only exist in fixed orbitals (shells) and not anywhere in between.
- Each shell has a fixed energy

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A mathematical representation of the Bohr Model.

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The Bohr Model was introduced by Niels Bohr and Ernest Rutherford in 1913.