摘要：14．Some properties elements belonging to the short periods are listed in the following table.Which of the following statements is true? Element No. ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ Atonic radius(10-9m) 0.74 1.52 1.60 1.10 0.99 0.75 1.86 0.82 Highest/lowest valence -2 +1 +2 +5 -3 +7 -1 +5 -3 +1 +3 A．②号元素和③号元素位于同一周期 B．⑦号元素和⑧号元素位于同一周期 C．④号元素的原子序数大于⑥号元素的原子序数 D．⑤号元素最高价氧化物的水化物的酸性比其他7种元素的相应化合物都强

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