Bohr came up with the Planetary Model for the atom. He said that the electrons in an atom were fixed into specific orbits. His theory stated that when an electron became “excited” it would leave ground level and jump up to another level. But the electron always wants to go back to ground level. When it goes back down it gives off energy in the form of light (the amount depending on how far down it goes). The different forms of light are what creates color. These different light forms create spectrum lines. Although Bohr's Theory about electrons being in orbits was later proven incorrect, he still helped discover the energy that is given off by electrons and set the base for quantum mechanics.
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Bohr's Planetary Model said that the electrons in an atom were fixed into specific orbits. They would move between orbits if they were excited or lost energy.
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When electrons go down orbit levels they give off energy in the form of light. The different jumps are what creates different colors. These different colors are called spectrum lines.
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