Daily Almanac for
Nov 30, 2009
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pe'ri•od'ic sys'tem



Pronunciation: (pēr'ē-od'ik, pēr"-), [key] Chem.
a system of classification of the elements based on the periodic law.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

periodic sentenceperiodic table
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