periodic table(redirected from Periodicity of the elements)
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Related to Periodicity of the elements: Periodic table of the elements
a systematic arrangement of the chemical elements. An earlier version was devised in 1869 by Dmitri 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.
per·i·od·ic ta·ble(pēr'ē-od'ik tā'bĕl)
A graphic arrangement of chemical elements by atomic number and chemical properties.
A chart with the chemical elements arranged by their atomic numbers.See: periodic law
See also: 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.