The electronic configuration of three elements A, B and C are as follows A=2,8,18,18,8,1B=2,8,18,18,7C=2,8,18,32,18,8Find the respective period and group to which of these belongs

The electronic configuration of three elements A, B and C are as follo

1.	The electronic configuration of three elements A, B and C are as follows A=2,8,18,18,8,1B=2,8,18,18,7C=2,8,18,32,18,8Find the respective period and group to which of these belongs
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