A. 1s22s22p63s23p2→1s22s22p63s23p1 B. 1s22s22p63s23p3→1s22s22p63s23p2 C. 1s22s22p63s23p4→1s22s22p63s23p3 D. 1s22s22p63s23p64s24p2→1s22s22p63s23p64s24p1
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