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【简答题】
前四周期原子序数依次增大的元素A、B、C、D中,A和B的价电子层中未电子均只有1个,并且A - 和B + 的电子数相差为8;与B位于同一周期的C和D,它们价电子层中的未电子数分别为4和2,且原子序数相差为2。四种元素中的第一电离能最小的是_________,(填元素符号,下同)电负性最大的是________。
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A.
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B.
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C.
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D.
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