HSCI 130 Lecture Notes - Summer 2018 Lecture 6 - Ernest Rutherford, Atomic nucleus, Cathode ray tube
20 Sep 2018
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Document Summary
3 atomic models: dalton, thomson, rutherford: description of the model (diagrams, observations & experiments they did, scientific weakness, overall contribution to atomic theory (p. 139-144 hebden and heath) Dalton"s atomic theory: elements are made of extremely small particles called atoms . Atoms of a particular element are identical; different types of atoms have different properties. Each chemical compound is unique and is made of specific atoms put in a specific way. Chemical reactions are the shuffling of atoms; new compounds are made from the same atoms of the original compound: experimented mostly with gases. Noted that water exists as gas in air. Law of definite proportions (law of constant composition): pure samples of a particular compound always have same proportion by mass of elements in the compound. Law of multiple proportions: when different masses of two elements combine, the mass ratios of one element are small whole number ratios.
