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Periodic table elements chemistry, "if all the elements are arranged in the order of their atomic weights, a periodic repetition of properties is obtained. this is expressed by the law of periodicity.".
Periodic table - wikipedia, free encyclopedia, A group or family is a vertical column in the periodic table. groups usually have more significant periodic trends than periods and blocks, explained below..
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Interactive periodic table. clicking element brings list general properties data, information discovery, history, , geologic.
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Periodic table questions [place answer blank left question number.] ___ 1. elements characterized nonmetals located .
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Origins periodic table elements. periodic table displays chemical elements grouped chemical properties atomic structure..