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【简答题】
几种短周期元素的原子半径和主要化合价见下表，下列说法中正确的是( )。 元素代号 原子半径/nm 主要化合价 X 0.160 ＋2 Y 0.143 ＋3 Z 0.102 ＋6、－2 L 0.099 ＋7、－1 M 0.077 ＋4、－4 Q 0.074 －2 A.等物质的量的X、Y的单质与足量的盐酸反应，生成的H 2 一样多 B．Y与Q形成的化合物不能跟氢氧化钠溶液反应 C．Z的氢化物的稳定性强于L的氢化物的稳定性 D．在化学反应中，M原子与其他原子易形成共价键而不易形成离子键
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