Question

What do you mean by periodic law

Answer 1

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Mendeleev's law states that "the properties of an element are the period functions of their atomic masses".

Henry Mosley modified Mendeleev's law and formed the modern periodic law which states that " the physical and chemical properties of an element are the periodic functions of their atomic numbers".
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Answer 2

Explanation:

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.