( 2019· 四川高三)第三周期 X 、 Y 、 Z 、 W 四种元素的最高价氧化物溶于水可得到四种溶液, 0.010 mol/L 的这四种溶液在 25°C 时的 pH 与该元素原子半径的关系如图所示。下列说法正确的是( ) A .简单离子半径: X>Y>Z>W B . W 的氧化物对应的水化物一定是强酸 C .气态氢化物的稳定性: W < Z < Y D . W 与 Z 可形成一种各原子均达到 8 电子稳定结构的化合物 Z 2 W 2
【简答题】短文理解 ( )1. A. They lost their way. B. They couldn't find any houses. C. They had to spend the night in the open air ( )2. A. To give them some water and food. B. To let them stay in his house ...
【多选题】中美班 Unit 3 P.17-5 排序 1.They did the easiest part of the journey. 2.They tried to avoid some boulders. 3.They were separated. 4.They set their kayaks in the river. 5.They had a few close calls.