【简答题】现有部分短周期元素的性质或结构如下表: 元素编号 元素性质或结构 X 海水中质量分数最大的元素,其氢化物是最常用的溶剂 Y 地壳中含量最多的金属元素 Z 形成化合物最多的元素 M 短周期主族元素中原子半径最大的元素 (1)X原子中电子运动状态共有____种。Z元素最简单的气态氢化物分子的空间构型是___。 (2)写出Y元素最高价氧化物对应水化物的电离方程式____________。 (3)下列说法...
【简答题】A daughter thought life was unpromising to her and complained to her father about it. She did not know how she was going to 21 and wanted to give up. She was 22 of fighting and struggling. It seemed a...
【简答题】第一节 完形填空 (共10小题;每小题2分,满分20分) 阅读下面短文,掌握其大意,然后从21 ~ 30各题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。 Mary seemed to be at a loss as to what is to live. One day the Spirit of Life came to her. “What do you call...