u3lectout - Unit 3 Atomic Structure Name Basics of the Atom...

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Unit 3: Atomic Structure Name: ____________________ Basics of the Atom Particle Charge Location in the Atom Mass a.m.u. : unit used to measure mass of atoms atomic number : -- -- mass number : To find net charge on an atom, consider ____ and ____. ion : anion : a (–) ion cation : a (+) ion -- -- -- -- Description Net Charge Atomic Number Mass Number Ion Symbol 15 p + 16 n 0 18 e 38 p + 50 n 0 36 e 128 Te 2– 18 e 1+ 39 Historical Development of the Atomic Model 1
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2 Greeks (~400 B.C.E.) Hints at the Scientific Atom ** Antoine Lavoisier: law of conservation of mass ** Joseph Proust (1799): law of definite proportions : every compound has a fixed proportion e.g., water……………………. . chromium (II) oxide……. ** John Dalton (1803): law of multiple proportions : When two different compounds have same two elements, equal mass of one element results in integer multiple of mass of other. e.g., water……………………. hydrogen peroxide……. e.g., chromium (II) oxide…… chromium (VI) oxide…. . John Dalton’s Atomic Theory (1808) 1. Elements are made of indivisible particles called atoms. 2. Atoms of the same element are exactly alike; in particular, they have the same mass. 3. Compounds are formed by the joining of atoms of two or more elements in fixed, whole number ratios. e.g., ** William Crookes (1870s): Rays causing shadow were emitted from cathode. The Thomsons (~1900)
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This note was uploaded on 11/09/2011 for the course CHEM 110 taught by Professor Sullivan during the Fall '10 term at BYU.

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u3lectout - Unit 3 Atomic Structure Name Basics of the Atom...

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