MENTION THE CRITERIA FOR PLACING ELEMENTS IN THE (i) SAME GROUP (ii) SAME PERIOD , GIVE EGS
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1. elements are placed in groups according to their electronic configuration. Ex-sodium, potassium
elements are placed in same period according to their number of shells.
Ex- sodium and magnesium have 3 electronic shells so they are kept in 3rd period
elements are placed in same period according to their number of shells.
Ex- sodium and magnesium have 3 electronic shells so they are kept in 3rd period
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