write down the electronic configuration of the first three elements of group what similarity you will find in the electronic configuration of these elements
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Explanation:
suppose you take 17 th group which consists halogens
TAKING THE FIRST ELEMENT FLOURINE :1s2 2s2 2p5
TAKING THE SECOND ELEMENT CHLORINE:[Ne]3s2 3s5
TAKING THE THIRD ELEMENT BROMINE:[Ar]3d10 4s2 4p5
By observation we can conclude that ELECTRONIC CONFIGURATION OF ALL THESE ATOMS END IN ns2 np5
Therefore in every group electronic configuration will end in same manner
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