periodic law


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Men·de·lé·eff law

(men-dĕ-lā'ĕf),
the properties of elements are periodic functions of their atomic weights; that is, if the elements are arranged in the order of their atomic weights, every element in the series will be related in respect to its properties to the eighth in order before or after it.
Synonym(s): periodic law

periodic law

The physical and chemical properties of chemical elements are periodic functions of their atomic number. A natural classification of elements is made according to their atomic number. When arranged in order (through calcium, atomic number 20), elements show regular variations in most of their physical and chemical properties.
See also: law

Mendeléeff,

Dimitri (Dmitri) I., Russian chemist, 1834-1907.
Mendeléeff law - the properties of elements are periodical functions of their atomic weights. Synonym(s): periodic law
mendelevium - an element, atomic No. 101, atomic weight 258.1, prepared in 1955 by bombardment of einsteinium with alpha particles.
References in periodicals archive ?
To avoid any form of misunderstanding of the terminology, we should keep in mind that, in each individual case, the Periodic Law sets up the fundamental dependence between the numerical value of the atomic nucleus and the properties of the element, while the Periodic System shows how we should use this law in particular conditions.
Section VII presents the development of specialization in chemistry, namely the birth of organic chemistry and introduction of the Periodic Law.
Major Works: Osnovy khimii (Principles of Chemistry) (1868), "On the Place of Cerium in the System of Elements" (1870, in Russian), "The Periodic Law of the Chemical Elements" (1889, in English)

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