Group the following electron configurations in pairs that would represent elements with similar properties:
(a) 1s22s22p5
(b) 1s22s1
(c) 1s22s22p6
(d) 1s22s22p63s23p5
(e) 1s22s22p63s23p64s1
(f) 1s22s22p63s23p64s23d104p6
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