试题与答案

X、Y、Z、W为四种短周期主族元素。其中X、Z同族,Y、Z同周期,W与X、Y既不

题型:选择题

题目:

X、Y、Z、W为四种短周期主族元素。其中X、Z同族,Y、Z同周期,W与X、Y既不同族也不同周期;X原子最外层电子数是核外电子层数的3倍;Y的最高正价与最低负价的代数和为6。下列说法正确的是[ ]

A. X与W可以形成W2X、W2X2两种化合物

B. Y元素最高价氧化物对应的水化物的化学式为H2YO4

C. 原子序数由小到大顺序为W<X<Y<Z

D. Y、Z两元素的简单离子的半径Y>Z

答案:

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