短文填词。（本大题共10小题，每小题1分，满分10分）

Students learn their lessons in class. They sit in the classroom and l 1  to the teacher. This is a way of learning. Is this the o 2  way for students to learn? Of course not. There is another way to learn. That is students can teach themselves. For e 3  , if you cannot remember something when you are doing your homework, what will you do? You can look at your books to f  4   the answers.

How to teach yourself? The first thing you must do is reading. Read something you are i 5  in, or you have to read. The second is that you must ask yourself questions. A clever student is usually g 6  at asking questions. The third is to answer the questions yourself by w 7  hard, by reading books, and sometimes by asking o 8  people. These are the ways of teaching yourself. If you keep doing l  9 these for a long time, You are sure to have great s  10  in your study.

有A、B、C、D、E五种短周期元素,已知相邻的A、B、C、D四种元素原子核外共有56个电子,在周期表中的位置如图所示。E的单质可与酸反应,1 mol E单质与足量酸作用,在标准状况下能产生33.6 L H₂;E的阳离子与A的阴离子核外电子层结构完全相同。

回答下列问题:

(1)A与E形成的化合物的化学式是　　　　。 

(2)B的最高价氧化物化学式为　　　　,C的元素名称为　　　　,D的单质与水反应的方程式为　____________________________

(3)向D与E形成的化合物的水溶液中滴入烧碱溶液直至过量,观察到的现象是

_____________________________________________________

有关反应的离子方程式为___________________________