periodic table

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periodic table

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.

periodic table

A chart with the chemical elements arranged by their atomic numbers.
See: periodic law
See also: table

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.
References in periodicals archive ?
apply a [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]-translation in order to place the representative element of [w.
We focus our study on the case where boxes and representative elements associated to vertices are spread in R.
We study the one-dimensional version (c-)p-Box(1) of the families in which the position of the representative elements induce an order of the vertices.
This ordering needs to have different representative elements in order to be totally defined.
Definition 2 (R-order) Given a graph [member of] that belongs to p-BOX(1) and a p-BOX(1)-realization R of G such that all representative elements are different.
We denote by [DELTA] the minimum distance between any two representative elements in [R.
perform a ([MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII])-translation in order to make the representative elements of [w.
Given the relevance defined in formula (1), the method for selecting the set of representative elements RE([S.
j]) for selection of representative elements, for example, the average relevance, [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII];
3) selection, as representative elements, of the elements [e.
Our method selects representative elements automatically.
j]) of its representative elements, two-term features are extracted according to the following method.

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