W、X、Y、Z均为短周期元素,W的最外层电子数与核外电子总数之比为7

WXYZ均为短周期元素,W的最外层电子数与核外电子总数之比为717XW同主族;Y的原子序数是WX的原子序数之和的一半;含Z元素的物质焰色反应为黄色。下列判断正确的是(   )

A.金属性:YZ                   B.氢化物的沸点:XW

C.离子的还原性:XW            D.离子半径:ZYX

答案

B

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