Element - cannnot be broken down smaller. Made of a single type of atom represented by a chemical symbol., periodic table - a chart of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns., chemical symbol - used to represent elements., compound - substance formed when two or more different chemical elements are chemically bonded together, Chemical formula - use of symbols to represent a chemical compound. EX: NaCl, atom - The smallest part of a substance that cannot be broken down chemically, molecule - a group of two or more atoms held together by chemical bonds, chemical change - rearranging atoms to create a new substance with different properties, physical change - a change in the physical appearance or state of matter without altering its chemical composition.,

Unit 1: Classifying Matter

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