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PART - 1 CH - 3 Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 3 Classification of Elements and Periodicity in Properties5 Marks
Question
Each first element of a group differs in properties with other members of group. Explain the statement with reason.
or
In second period there is a difference between properties of elements. Why?
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