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Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.

b. 1H, 7N, 20Ca, 16S, 4 Be, 18Ar Which of these elements belong to the second group?

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 1H, 7N, 20Ca, 16S, 4 Be, 18Ar 

Electronic configuration of atoms ::

 1H=1

 7N=2,5

 20Ca=2,8,8,2

 16S=2,8,6

 4 Be=2,2

 18Ar=2,8,8 

Among the given elements, Ca and Be belong to second group. Because both has two electrons in the outermost shell. Thus, these two elements belong to second group.

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