on what basis elements are placed in same group and period
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on the basis of their chemical properties
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elements in the periodic table are arranged on the basis of their increasing atomic number
group - elements having same number of valence electrons are placed in the same group
period - elements having same number of shells are placed in the same period
group - elements having same number of valence electrons are placed in the same group
period - elements having same number of shells are placed in the same period
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