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Bohr Atom The Planetary Model of the Atom. Bohrs Model Nucleus Electron Orbit Energy Levels.

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Presentación del tema: "Bohr Atom The Planetary Model of the Atom. Bohrs Model Nucleus Electron Orbit Energy Levels."— Transcripción de la presentación:

1 Bohr Atom The Planetary Model of the Atom

2 Bohrs Model Nucleus Electron Orbit Energy Levels

3 Bohr Model of Atom The Bohr model of the atom, like many ideas in the history of science, was at first prompted by and later partially disproved by experimentation. Increasing energy of orbits n = 1 n = 2 n = 3 A photon is emitted with energy E = hf e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e-

4 Modelo de Bohr del átomo El modelo de Bohr del átomo, al igual que en muchas de las ideas la historia de la ciencia, en la primera fue motivada por y más tarde parcialmente desmentida por la experimentación. El aumento de la energía De las órbitas n = 1 n = 2 n = 3 Un fotón es emitido Con la energía E = hf e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e-

5 Cartoon courtesy of NearingZero.net

6 Development of the Atom

7

8 Planetary Model +

9 An unsatisfactory model for the hydrogen atom According to classical physics, light should be emitted as the electron circles the nucleus. A loss of energy would cause the electron to be drawn closer to the nucleus and eventually spiral into it. Hill, Petrucci, General Chemistry An Integrated Approach 2nd Edition, page 294

10 Quantum Mechanical Model Modern atomic theory describes the electronic structure of the atom as the probability of finding electrons within certain regions of space (orbitals). Niels Bohr & Albert Einstein

11 Development of Atomic Models Rutherford model In the early twentieth century, Rutherford showed that most of an atom's mass is concentrated in a small, positively charged region called the nucleus. Bohr model After Rutherford's discovery, Bohr proposed that electrons travel in definite orbits around the nucleus. Thomson model In the nineteenth century, Thomson described the atom as a ball of positive charge containing a number of electrons. Quantum mechanical model Modern atomic theory described the electronic structure of the atom as the probability of finding electrons within certain regions of space.

12 Modern View The atom is mostly empty space Two regions –Nucleus protons and neutrons –Electron cloud region where you might find an electron


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