X、Y、Z是3种短周期元素,其中X、Y位于同一主族,Y、Z处于同一周期

X、Y、Z是3种短周期元素,其中X、Y位于同一主族,Y、Z处于同一周期。X原子的最外层电子数是其电子层数的3倍。Z原子的核外电子数比Y原子少1。下列说法正确的是(    )

A.元素非金属性由强到弱的顺序为. Z>Y>X

B.Y元素最高价氧化物对应水化物的化学式可表示为H3YO4

C.3种元素的气态氢化物中,Z的气态氢化物最稳定

D.原子半径有大到小的顺序为Z.>Y>X

 

答案

D

解析:

 

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