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The principle stating that the properties of the elements recur periodically as their atomic numbers increase.
(Chemistry) 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
pe′ri•od′ic law′(ˈpɪər iˈɒd ɪk, ˌpɪər-)
1. the law that the properties of the chemical elements are periodic functions of their atomic numbers.
2. (formerly) 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.
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|Noun||1.||periodic law - (chemistry) the principle that chemical properties of the elements are periodic functions of their atomic numbers|
law of nature, law - a generalization that describes recurring facts or events in nature; "the laws of thermodynamics"