Which electron configurations represent the first two elements in Group 17 (7A) of the Periodic Table?
A
1s22s1 and 1s22s2
B
1s22s22p6 and [Ne]3s23p5
C
1s22s22p5 and [Ne]3s23p5
D
1s22s2 and 1s22s22p1
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