题目

阅读理解For a good night's sleep, here is some expert advice: Turn off, turn in and drop off. Anyone who does the opposite—turning on an iPad or other similar electronic readers in bed — may have a harder time both dropping off to sleep and shaking that weak feeling the next morning, a new study found.Sleep experts at Brigham and Women's Hospital in Boston, found that the light from a tablet computer upsets the body's internal (体内的) clock while reading a printed book does not have the same effect.An internal clock helps regulate when we sleep. Exposure to the light of有x、Y、Z、M、R、Q六种短周期主族元素，部分信息如下表所示：    X  Y Z   M  R  Q  原子半径/nm      0.186  0.074  0.099  0.160  主要化合价   -4，+4   -2 -1，+7    其它  阳离子核外无电子  无机非金属材料的主角  六种元素中原子半径最大      次外层电子数是最外层电子数的4倍请回答下列问题：（1）R在元素周期表中的位置是______．（2）根据表中数据推测，Y的原子半径的最小范围是______．（3）Z、M、Q的简单离子的离子半径的大小顺序为______ （用元素符号表示）．（4）Y与R相比，非金属性较强的是______ （用元素符号表示），下列事实能证明这一结论的是______ （选填字母序号）．a．常温下Y的单质呈固态，R的单质呈气态b．稳定性XR＞YX．c．Y与R形成的化合物中Y呈正价（5）X、M、Z三种元素组成的化合物中含有的化学键为______；写出R的单质与上述化合物的水溶液反应的离子方程式：______．