Definition of periodic law
: a law in chemistry: the elements when arranged in the order of their atomic numbers show a periodic variation of atomic structure and of most of their properties
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“Periodic law.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/periodic%20law. Accessed 10 May. 2021.
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The first known use of periodic law was in 1872
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