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Niels Bohr

Niels Bohr. By: Krista. Background Information. In 1885 , the famous Niels Bohr was born in Copenhagen, Denmark. Initially, Bohr studied philosophy and mathematics at the Copenhagen University . After university, in 1918 , he began his study of physics .

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Niels Bohr

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  1. Niels Bohr By: Krista

  2. Background Information In 1885, the famous Niels Bohr was born in Copenhagen, Denmark. Initially, Bohr studied philosophy and mathematics at the Copenhagen University. After university, in 1918, he began his study of physics. In 1920, Niels met and joined Ernest Rutherford at Manchester University. He spent four years working alongside the physics professor.

  3. The Atomic Model; Theories and Beliefs In 1913, Niels Bohr introduced the Bohr Model,a variation ofthe Atomic Model. The Bohr model describes an atom as a nucleus with a positive charge. The nucleus is surrounded by electrons that travel around it in an orbit.

  4. How the Theory Was Born Before Niels Bohr, there had been many scientists who had tried to explain the theory of atoms and electrons. They all failed. Niels proposed the Bohr theory to explain how electrons orbit the nucleus. His theory was correct, and successfully explained why electrons emit and absorb light.

  5. Where the Model Came From The Bohr model was an improvement on 3 different models, explaining the same theory. The cubic model created in 1902 by Gilbert Lewis. It was used to explain how cubic atoms share electrons. The plum pudding model, developed in 1904 by J. J. Thomson, explained how electrons freely rotate in positive substances. The Rutherford model, introduced in 1911, showed that atoms have massive nucleuses in their centers. The nucleus is surrounded by orbiting electrons.

  6. Why the Theory Was Revised Nielsrevised the theory for multiple reasons. The original cubic model and plum pudding model had been disproved by Rutherford’s model. Bohr changed the Rutherford model by stating that electrons move around the nucleus in a fixed size and energy.

  7. Diagram Bohr found that the closer an electron is to the nucleus, the less energy it needs, but the farther away it is, the more energy it needs. So Bohr numbered the electrons energy levels. The higher the energy the farther away the electron is from the nucleus and the higher the energy.

  8. Problems with the Model Bohr’s model is only valid for the hydrogen atom (with one electron) Bohr also failed to explain the nature of atoms more complicated than hydrogen. Took about a decade before a new more complete atom theory was developed.

  9. Niels Bohr will go down to be one of the most knowledgeable scientists we know. http://www.youtube.com/watch?v=ZkNPBy2i0ss THANK YOU

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