1H,7N,20Ca,16S,4Be,18Ar which if the elements belong to second gr
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the elements which belong to second group will have valency +2
therefore
1-electronic configuration of H=1
2-electronic configuration of N=2,5
3-electronic configuration of Ca=2,8,8,2
4-electronic configuration of S=2,8,6
5-electronic configuration of Be=2,2
6-electronic configuration of Ar=2,8,8
only calcium and beryllium have +2 valency hence they belong to second group.
hope it helps you
therefore
1-electronic configuration of H=1
2-electronic configuration of N=2,5
3-electronic configuration of Ca=2,8,8,2
4-electronic configuration of S=2,8,6
5-electronic configuration of Be=2,2
6-electronic configuration of Ar=2,8,8
only calcium and beryllium have +2 valency hence they belong to second group.
hope it helps you
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