短周期元素X、Y、Z、W、Q在元素周期表的位置如表所示，其中X元素的原子内层电子数是最外层电子数的一半，则下列说法正确的是
| X |
|
Y |
|
| Z |
|
W |
Q |
A．W得电子能力比Q强
B. 由Z与Y组成的物质在熔融时能导电
C. 化合物XQ4中含有σ键和π键
D．WY3空间结构为平面三角形
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