CHEM 106 Lecture 4: Chapter 4 & 24 -The Structure of an Atom & Nuclear Chemistry
25 Nov 2017
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Chapter 4: the structure of an atom & nuclear chemistry. Chapter 4 & 24: the structure of an atom & nuclear chemistry: Aristotle greek philosopher (384-322 b. c. : stated that atoms did not move through empty space, believed that matter is made of earth, fire, air, and water. 1: cathode ray particle seemed to emanate from the metal of the cathode, suggesting that matter (atoms) contained these particles. Robert millikan oil drop experiment determined the charge and mass of an electron: this experiment determined that opposite charges react to each other. Ernest rutherford (1911) conducted gold foil experiment which led to new model of the atoms. Protons, neutrons, and electrons: atom the smallest particle of an element that retains the properties of the element (gold ring example) Atomic number: the atomic number of an element is equal to the number of protons, the number of protons determine the identity of the element.
