atom - smallest particle of an element that maintains the properties of that element, atomic mass - average mass number of all atoms of an element (from particles in the nucleus), atomic number - the number of protons in the nucleus of an atom; used to determine an element's position in the Periodic Table, chemical property - a characteristic of a substance that describes how it combines with other substances to form new ones, electron - a negatively charged particle in the electron cloud surrounding the atomic nucleus, electron cloud - the negatively charged space containing electrons that surrounds the atomic nucleus, element - a pure substance that cannot be broken down chemically into simpler substances, groups - the vertical columns on the Periodic Table, periods - the horizontal rows on the periodic table, valence electrons - elements in the same group have the same number of ____________________, energy levels - elements in the same period have the same number of _____________________________, mass number - total number of protons and neutrons in a specific atom, neutron - a (neutral) particle with no electrical charge within the atomic nucleus, nucleus - the positively charged center of an atom containing the protons and neutrons, physical property - property of matter that can be observed without changing the composition or identity of the matter, proton - a positively charged particle within the atomic nucleus; used to identify an element, reactivity - tendency of a substance to undergo chemical changes in a system, subatomic particle - a particle smaller than an atom, such as a proton, neutron, or electron, periodic table - a conceptual model in which the elements are organized according to their properties; often displayed as a chart, properties of non-metals - insulator, brittle, dull, properties of metals - conductor, malleable, ductile, luster, properties of metalloids - semi-conductor; mix of metals and nonmetals, malliabilty - ability to be hammered into a sheet, ductile - ability to be made into a wire, chemical change - the formation of a new substance with different properties; cannot be undone by physical means, precipitate - the formation of solids from a solution, product - substance(s) resulting from a chemical reaction, reactant - substances that are combined and changed during a chemical reaction, subscript - represents the number of atoms of an element present in a chemical formula, coefficient - represents the number of molecules in a chemical formula or equation,

Chemistry

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