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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
Question
What is the most important cause of periodicity?
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Answer

Similarity in outer electronic configuration and gradual addition of an electron into the successive elements, are the most important cause of periodicity.

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