The repitation of physical and chemical properties of elements
periodically is called periodicity
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Lack of periodicity means there's no pattern of repeat or
recurrence.
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The study of periodicity is analyzing a certain topic or even an
issue over a time span. The time span of the study could be up to
years possibly. An example of a study of periodicity was conducted
by Columbia University.
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The repitation of physical and chemical properties of elements
periodically is called periodicity
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mendeleev arranged elements according to atomic mass. He was able to observe periodicity when arranged in this pattern.