Answer :

Electronic configuration


i. The characteristics of the groups and periods in the modern periodic table are because of the electronic configuration of the elements.


ii. It is the electronic configuration of an element which decides the group and the period in which it is to be placed.


iii. While going from top to bottom within any group, one electronic shell gets added at a time. From this we can say that the electronic configuration of the outermost shell is characteristic of a particular group.


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