X、Y是短周期元素,它们可组成化合物XY,则下列说法正确的是(  

X、Y是短周期元素,它们可组成化合物XY,则下列说法正确的是(    )

A.X与Y一定是离子化合物

B.若Y的原子序数为m,X的原子序数则是m±6

C.X与Y可属于同一周期,也可属于两个不同周期

D.X与Y一定不属于同一主族

答案

C

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