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某原子的基态电子排布为1s22s22p63s23p63d64s2,该元素不可能的价态是
A.-1 B.+2 C.+3 D.0
A.1s22s22p6 B.1s22s22p53s2
C.1s22s22p63s23p63d64s2 D.1s22s22p63s23p63d24s2