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Chap3Lec - DRAFT(Chap 3 Page 1 Law of Constant...

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DRAFT (Chap 3) Page 1 Law of Constant Composition (or Law of Definite Proportions) Dalton’s Atomic Theory (early 1800’s) Simple substances called elements are composed of indivisible and indestructible particles called atoms. Atoms of the same element are identical but differ from those of any other element. Each type of atom has a mass that is different from that of any other type of atom. Atoms combine only in whole-number combinations to form molecules. Compounds are composed of molecules. All molecules of a compound are identical to each other. In chemical reactions atoms are rearranged to produce different substances. The identity of each atom and its mass are unchanged.
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DRAFT (Chap 3) Page 2 Atoms Atomic Mass Unit (amu) Nucleus Subatomic Particles Electron Proton Neutron
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DRAFT (Chap 3) Page 3 Isotopes
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DRAFT (Chap 3) Page 4
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DRAFT (Chap 3) Page 5 Bohr Atom Quantized energy Each e- has an “address” that consists of four parts (4 quantum numbers) 1. A principle energy level (n) 2.
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