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[peer-ee-od-ik, peer-] /ˈpɪər iˈɒd ɪk, ˌpɪər-/

noun, Chemistry.
the law that the properties of the elements are periodic functions of their atomic numbers.
Also 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.
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

periodic law n.
The principle that properties of elements recur periodically as atomic numbers increase.


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