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The Evolution of the Atomic Model: Thomson’s plum-pudding Rutherford’s nuclear model

The Evolution of the Atomic Model: Thomson’s plum-pudding Rutherford’s nuclear model. An electron in orbit about the nucleus must be accelerating; an accelerating electron give off electromagnetic radiation. So, an electron should lose energy and spiral into the nucleus.

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Chapter 28

Chapter 28. Conceptual questions: 2,4,8,9,16 Quick quizzes: 1,2,3,4 Problems: 18, 39 Examples: 1,3,4. Atomic Physics. Rutherford’s Model of the Atom. Planetary model Positive charge is concentrated in the center of the atom, called the nucleus

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The Bohr-Rutherford Atom

The Bohr-Rutherford Atom. Physics 100 Chapt 23. Nils Bohr. Ernest Rutherford. 1895 J.J. Thomson discovered electron. Vacuum flask. cathode. + +. - - -. “cathode rays”. + +. -. +. anode. Cathode rays have negative charge and very small mass. S. cathode. + +. - - -. + +. -.

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