有两种短周期元素X和Y,可组成化合物XY3,当Y的原子序数为m时,X的

有两种短周期元素XY,可组成化合物XY3,当Y的原子序数为m时,X的原子序数为:m4m4m8m2m6。其中正确的组合是(  )

A①②④     B①②⑤        C①②③⑤        D①②③④⑤

答案

D

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