X、Y、Z和W代表原子序数依次增大的4种短周期元素。X元素原子最外层

X、Y、Z和W代表原子序数依次增大的4种短周期元素。X元素原子最外层电子数比次外层电子数多1;Z与Y相邻,Z比Y的电子数多8;W元素原子最外层电子数等于电子层数的2倍。下列说法正确的是: (   )

A.原子半径Y > Z> W

B.Y、Z和W三种元素位于同一周期

C.Y元素最高价氧化物对应的水化物一定是强酸

D.Y、Z的最高正价与最低负价绝对值之和均为8

 

答案

D

解析:

 

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