-- ? --I cut my finger. A. What's matter B. What's the matter C. What's doing matter D. How is the matter 答案:BX、Y、Z、R、W是5种短周期元素,原子序数依次增大,它们可组成离子化合物Z2Y和共价化合物RY3、XW4,已知Y、R同主族, Z、R 、W同周期。下列说法不正确的是A.原子半径:Z>R>WB.X2W6分子中各原子均满足8电子结构C.气态氢化物沸点:HmY>HnRD.Y、Z、R三种元素组成的化合物水溶液一定显碱性