| periodic table n. A tabular arrangement of the elements according to their atomic numbers so that elements with similar chemical properties are in the same column. |   |
periodic table,
a systematic arrangement of the chemical elements. An earlier version was devised in 1869 by Dmitrii Ivanovich Mendeleev (Russian chemist, 1834-1907). By arranging the elements in order of their atomic weights, he was able to show relationships, such as valency, that occurred at regular intervals and was able to predict the properties of elements still undiscovered in the nineteenth century.
periodic table,
n a pictorial representation of all chemical elements arranged by increasing order of atomic numbers. Periods and groups are the primary classifications found within the table.
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