NSCI 1321 Chapter 2: General Chem Chapter 2
15 Feb 2017
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Document Summary
Atomic theory an explanation of the structure of matter in terms of different combinations of very small particles (atoms): all matter is composed of indivisible atoms. Water: a chemical reaction consists of the rearrangement of the atoms present in the reacting substances to give new chemical combinations present in the substances formed by the reaction. An atomic symbol is a one- or two-letter notation used to represent an atom corresponding to a particular element. Law of multiple proportions when two elements form more than one compound, the masses of one element in these compounds for a fixed mass of the other element are in ratios of small whole numbers. Nucleus the atom"s central core; it has most of the atom"s mass and one or more units of positive charge. Electron a very light, negatively charged particle that exists in the region around the atom"s positively charged nucleus.
