右图是元素周期表前四周期的一部分，关于元素R、W、X、Y、Z的叙述

右图是元素周期表前四周期的一部分，关于元素R、W、X、Y、Z的叙述正确的是(　　)

A．最高价氧化物的水化物的酸性：W＞Y

B．Z的单质常温下是液体，所在的周期中含有32种元素

C．Z的原子序数比R大17

D．氢化物的沸点：X＜Z

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右图是元素周期表前四周期的一部分，关于元素R、W、X、Y、Z的叙述

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