Makeupwords. 将下面的字母组成单词，写在横线上。1. etsb2.i

（15分）下表为元素周期表的一部分，请参照元素①－⑧在表中的位置，用化学用语回答下列问题：

族 周期	IA							0
1		ⅡA	ⅢA	ⅣA	ⅤA	ⅥA	ⅦA
2				①	⑧	②
3	③	④	⑤	⑥	⑦

（1）②、④、⑤的原子半径由大到小的顺序为____________________。

②、④、⑤的离子半径由大到小的顺序为____________________。

（2）①②⑥⑦四种元素所对应的气态氢化物最稳定的是________，最不稳定的是_____（填化学式）。

(3)②、③可形成既含离子键又含共价键的化合物，其阳离子和阴离子的个数比为_____。

（4）③、⑤两元素最高价氧化物对应水化物发生反应的离子方程式为__________________________。

(5)工业上用①单质大量生产⑥单质，反应的化学方程式为_______________________________。

（6）④⑤两元素相比较，金属性较强的是       （填名称），用原子结构知识解释                                    ，可以验证该结论的实验是      （填编号）。

（a）将在空气中放置已久的这两种元素的块状单质分别放入热水中

（b）将形状、大小相同的这两种元素的单质分别和同浓度的盐酸反应

（c）将形状、大小相同的这两种元素的单质分别和热水作用，并滴入酚酞溶液

（d）分别往氯化镁溶液、氯化铝溶液中逐滴滴入氢氧化钠溶液直到过量。

(7)由表中元素形成的常见物质X、Y、Z、M、N可发生以下反应：

X溶液与Y溶液反应的离子方程式为____________                _________，

提示胎儿皮肤成熟度

A．羊水中肌酐值
B．羊水震荡试验
C．羊水脂肪细胞出现率
D．羊水细胞学检查
E．羊水胆红素测定

如图所示，理想变压器的原副线圈匝数比n1：n2=1：10，副线圈与阻值R=20Ω的电阻相连．原线圈两端所加的电压u=20sin20πt(V)，则（　　） A．副线圈输出交流电的频率为10Hz B．交流电压表的示数为20V C．电阻R上消耗的电功率为2kW D．原线圈中电流的最大值为100A

Many teenagers(青少年) feel that the most important people in their lives are their friends. They believe that their family members don’t know them as well as their friends do. In large families, it is quite often for brothers and sisters to fight with each other and then they can only go to their friends for some ideas．

It is very important for teenagers to have one good friend or a group of friends. Even when they are not with their friends, they usually spend a lot of time talking among themselves on the phone. This communication is very important in children’s growing up, because friends can discuss something. These things are difficult to tell their family members.

However, parents often try to choose their children’s friends for them. Some parents may even stop their children from meeting their good friends. Have you ever thought of the following questions?

Who chooses your friends?

Do you choose your friends or your friends choose you?

Have you got a good friend your parents don’t like?

Your answers are welcome.

小题1:Many teenagers think that ____ can understand them better.

A．friends

B．brothers

C．sisters

D．parents小题2:When teenagers have something difficult to tell their parents, they usually____

A．stay alone at home

B．fight with their parents

C．discuss it with their friends

D．go to their brothers and sisters for help小题3:The sentence (句子) “Your answers are welcome．” means _______．

A．You are welcome to discuss the questions with us.

B．We have got no idea, so your answers are welcome.

C．Your answers are always right.

D．You can give us all the right answers.小题4:Which of the following is the writer’s attitude(态度)?

A．Parents should choose friends for their children

B．Children should choose everything they like

C．Parents should understand their children better

D．Teenagers should only go to their friends for help小题5:Part of the purpose of this passage is to ___.

A．give information for the parents to make their own judgment (判断)

B．give advice to children who want to choose their friends

C．help parents to find better friends for their children

D．get some information from many readers

半场截击