Lec-04-Chap-02-1 - CHE 131 Lecture 4, 1/30/2006 Atoms...

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CHE 131 Lecture 4, 1/30/2006 1 Atoms Lecture four (Chapter two) Benjamin S. Hsiao Department of Chemistry Stony Brook University Atomic Structure Electrical charges of the same type repel one another, and charges of the opposite type attract one another. J.J. Thompson (1856-1940) English physicist At the turn of the century, Thompson experimented with what he called a cathode-ray tube. He found that the beam was made up of negatively charged particles, now called electrons. 1600 1700 1800 1900 2000 Radioactivity
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CHE 131 Lecture 4, 1/30/2006 2 Alpha Radiation • composed of 2 protons and 2 neutrons • thus, helium-4 nucleus • +2 charge • mass of 4 amu • creates element with atomic number 2 lower Beta Radiation • composed of a high energy electron which was ejected from the nucleus • “neutron” converted to “proton” • very little mass • -1 charge • creates element with atomic number 1 higher Gamma Radiation • nucleus has energy levels • energy released from nucleus as the nucleus
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This note was uploaded on 09/04/2009 for the course CHE 81914-01 taught by Professor Prof.benjaminhsiao during the Spring '06 term at SUNY Stony Brook.

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Lec-04-Chap-02-1 - CHE 131 Lecture 4, 1/30/2006 Atoms...

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