Lecture_8_Atomic_mod - LECTURE NOTES LECTURE 8 Atomic Models GENERAL CHEMISTRY Fall 2008 Updated A Defining the Atom 1 Atomic Theory a All matter

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L E C T U R E N O T E S LECTURE 8 Atomic Models GENERAL CHEMISTRY Fall 2008 Updated: 11/22/2011
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A. Defining the Atom 1. Atomic Theory a. All matter is made up of very tiny particles called atoms b. Atoms of the same element are chemically alike c. Individual atoms of an element may not all have the same mass. However, the atoms of an element have a definite average mass that is characteristic of the element d. Atoms of different elements have different average masses e. Atoms are not subdivided, created, or destroyed in chemical reactions 2. Sizes of Atoms a. Atomic radius i. 40 to 270 picometers (pm) 1. 1 pm = 10 -12 m ii. Most of the atomic radius is due to the electron cloud b. Nuclear radius i. 0.001 pm ii. density is 2x10 8 metric tons/cm3 1. 1 metric ton = 1000kg B. Structure of the Nuclear Atom 3. The Electron a. Discovery i. Joseph John Thomson (1897) 1. Cathode ray tube produces a ray with a constant charge to mass ratio 2. All cathode rays are composed of identical negatively charged
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Lecture_8_Atomic_mod - LECTURE NOTES LECTURE 8 Atomic Models GENERAL CHEMISTRY Fall 2008 Updated A Defining the Atom 1 Atomic Theory a All matter

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