periodic law

pe′ri•od′ic law′ [Chem.]

Chemistrythe law that the properties of the elements are periodic functions of their atomic numbers.
ChemistryAlso called Mendeleev's law. (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights.

Collins Concise English Dictionary © HarperCollins Publishers::

periodic law /ˌpɪərɪˈɒdɪk/ n

Also called: Mendeleev's law the principle that the chemical properties of the elements are periodic functions of their atomic weights or, more accurately, of their atomic numbers

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