2 - Atoms and Elements

2 - Atoms and Elements - Chapter 2: Atoms and Elements...

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Chapter 2: Atoms and Elements atomic structure – identity and arrangement of subatomic particles in atom 2.1 Atomic Structure and Subatomic Particles Radioactivity o alpha rays are deflected, 2+ charge, mass, deflected less because they are heavier o beta are deflected, 1- charge, mass o gamma are not deflected, no charge or mass, light rays Electrons o Thomson performed cathode ray tube to discover ratio of mass to charge for the electrons o Milikan performed oil drop experiment to discover charge on an electron and then mass of electron o Mass: 9.10 x 10 -28 ; Charge: -1.60 x 10 -19 Coulombs Protons o Ions are charged atoms o Mass: 1.67 x 10 -24 ; Charge: 1.60 x 10 -19 2.2 The Nuclear Atom The Nucleus o Rutherford’s gold foil experiment to discover structure of an atom o nucleus is dense and highly charged region with most of mass in small region o most of the volume is taken up by electrons outside the nucleus, but almost no mass Neutrons o Mass: 1.67 x 10 -24 ; Charge: none o Protons + neutrons make up nucleus; provide most mass o Nuclear radius = 10,000 x smaller than radius of entire atom 2.3 The Sizes of Atoms and the Units Used to Represent Them SI unit system used, based on metric
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This note was uploaded on 09/28/2009 for the course CHEM 1A taught by Professor Nitsche during the Fall '08 term at Berkeley.

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2 - Atoms and Elements - Chapter 2: Atoms and Elements...

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