Answer :

Electronic configuration:


The atomic number of hydrogen = 1


The electronic configuration of 1H = 1


The atomic number of nitrogen = 7


The electronic configuration of 7N = 2,5


The atomic number of calcium = 2


The electronic configuration of 20Ca = 2,8,8,2


The atomic number of sulphur = 16


The electronic configuration of 16S = 2,8,6


The atomic number of beryllium = 4


The electronic configuration of 4Be = 2,2


The atomic number of argon = 18


The electronic configuration of 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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