在短周期元素中,A元素的最高正化合价和负化合价的绝对值之差为6

在短周期元素中,A元素的最高正化合价和负化合价的绝对值之差为6B元素与A元素的原子次外层上的电子数均为8A元素与B元素可以形成化合物BA2,则该化合物是:

AMgCl2      BCaCl2        CSiO2        DCS2

答案

A  

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