[题目]根据元素周期表1~20号元素的性质和递变规律,回答下列问题:(1)属于金属元素的有种,其中金属性最强的元素的单质与氧气反应生成的化合物的化学式为 (填两种).(2)最高正化合价最高的元素是 (填元素符号),其最高正化合价为 .(3)单质既能与HCl反应,又能与NaOH反应的是 ,其最高价氧化物对应的水化物具有 (填“酸性 “碱性或“两性 ).( 题目和参考答案——青夏教育精英家教网—

精英家教网 > 高中地理 > 题目详情

【题目】根据元素周期表1~20号元素的性质和递变规律,回答下列问题:

（1）属于金属元素的有种,其中金属性最强的元素的单质与氧气反应生成的化合物的化学式为（填两种）。

（2）最高正化合价最高的元素是（填元素符号）,其最高正化合价为。

（3）单质既能与HCl反应,又能与NaOH反应的是 ,其最高价氧化物对应的水化物具有（填“酸性”“碱性”或“两性”）。

（4）第三周期中,原子半径最大的元素是（稀有气体元素除外）。

（5）比较Si、N最简单氢化物的稳定性: （用化学式表示）。

【答案】（1）7;K2O、K2O2（KO2也可以）

（2）Cl;+7价

（3）Al;两性

（4）Na

（5）NH3>SiH4

【解析】前20号元素中,（1）属于金属元素的共有7种,其中金属性最强的元素是钾,钾单质与氧气反应生成的化合物有K2O、K2O2、KO2;（2）最高正化合价最高的元素是Cl,其最高正化合价为+7价;（3）既能与HCl反应又能与NaOH反应的单质是铝,其最高价氧化物对应的水化物是Al（OH）3,具有两性;（4）同一周期从左往右,原子半径逐渐减小,故第三周期中,原子半径最大的是Na;（5）非金属性:N>P>Si,故NH3的稳定性大于SiH4的稳定性。

练习册系列答案

年级	高中课程	年级	初中课程
高一	高一免费课程推荐！	初一	初一免费课程推荐！
高二	高二免费课程推荐！	初二	初二免费课程推荐！
高三	高三免费课程推荐！	初三	初三免费课程推荐！
更多初中、高中辅导课程推荐,点击进入>>

相关习题

科目：高中地理 来源： 题型：

【题目】书面表达（共15分）

假设你是李津，从互联网上得知一个国际小学生组织将在新加坡(Singapore)举办夏令营，欢迎各国学生参加。请写一封电子邮件申请参加。

内容主要包括：

1. 自我介绍(包括性格、特长、英语能力，沟通能力等)；

2. 参加意图(介绍中国的历史与文化并了解其他国家)；

3. 希望获准。

注意：

1. 词数100左右；

2. 可以适当增加细节，以使行文连贯；

3. 邮件开关和结尾已为你写好。

Dear Sir or Madam,

________________________________________________________________________________________________________________________________________________________________________________________

____________________________________________________________________________________________

___________________________________________________________________________________________

__________________________________________________________________________________________

Looking forward to your reply!

Regards,

Li Jin

查看答案和解析>>

科目：高中地理 来源： 题型：

【题目】某化学学习小组为了探究新制备的饱和氯水的组成和性质进行了科学实验：先观察了氯水的外观后，再用滴管将新制备的氯水逐滴滴入含有酚酞的红色NaOH溶液中，边滴加边振荡，并观察现象，结果溶液中的红色逐渐褪去，得到无色溶液。请回答：

(1)写出新制的氯水中含氯元素的物质的化学式_________________________。

(2)根据预测，实验中溶液红色褪去的原因可能有两种。请用简要的文字说明：

①__________________________________；

②__________________________________。

(3)为了探究溶液红色褪去的原因是上述原因中的①还是②，请叙述相应的实验方法、现象和结论。

____________________________________。

查看答案和解析>>

科目：高中地理 来源： 题型：

【题目】书面表达

假如你是李华，你的英国笔友Bob来信说，他不明白为什么许多中国父母喜欢用古诗启蒙孩子，请你写一封回信解释其中的原因。内容要点如下：

1. 中国是一个历史悠久的国家，文化形式多样，尤其以古诗歌闻名于世。

2. 诗歌有一定的韵律，语言简洁，具有易学、易记的特点。

3. 诗歌富含感情色彩，且富有想象力，深受孩子们的喜爱。

注意：

1. 词数100左右；

2. 可以适当增加细节，以使行文连贯。

Dear Bob,

I was glad to hear from you. _________________________________ _________________

_____________________________________________________________________________________

Best wishes.

Yours,

Li Hua

查看答案和解析>>

科目：高中地理 来源： 题型：

【题目】听一段材料，回答下面几个小题。

【1】When did the magician first perform professionally?

A. In 1964.

B. In 1968.

C. In 1972.

【2】What made the magician world famous?

A. His TV show.

B. His global tours.

C. His teaching job.

【3】Which does the magician think is his greatest achievement?

A. Project Magic.

B. Box office records.

C. The Magic of ABC.

【4】How is the magician different from other magicians?

A. He practises hard.

B. He believes in wonder.

C. He started his career early.

查看答案和解析>>

科目：高中地理 来源： 题型：

【题目】七选五

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Building Trust in a Relationship Again

Trust is a learned behavior that we gain from past experiences. ____1____ Trust is a risk. But you can’t be successful when there’s a lack of trust in a relationship that results from an action where the wrongdoer takes no responsibility to fix the mistake.

Unfortunately, we’ve all been victims of betrayal. Whether we’ve been stolen from, lied to, misled, or cheated on, there are different levels of losing trust. Sometimes people simply can’t trust anymore. ____2____ It’s understandable, but if you’re willing to build trust in a relationship again, we have some steps you can take to get you there.

●____3____ Having confidence in yourself will help you make better choices because you can see what the best outcome would be for your wellbeing.

●____4____ If you’ve been betrayed, you are the victim of your circumstance. But there’s a difference between being a victim and living with a ＂victim mentality＂. At some point in all of our lives, we’ll have our trust tested or violated.

●You didn’t lose ＂everything＂. Once trust is lost, what is left? Instead of looking at the situation from this hopeless angle, look at everything you still have and be thankful for all of the good in your life. ____5____ Instead, it’s a healthy way to work through the experience to allow room for positive growth and forgiveness.

A. Learn to really trust yourself.

B. It is putting confidence in someone.

C. Stop regarding yourself as the victim.

D. Remember that you can expect the best in return.

E. They’ve been too badly hurt and they can’t bear to let it happen again.

F. This knowledge carries over in their attitude toward their future relationships.

G. Seeing the positive side of things doesn’t mean you’re ignoring what happened.

查看答案和解析>>

科目：高中地理 来源： 题型：

【题目】七选五

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。

Encouraging your high school student to do his/her best isn’t as hard as you may think. It does take time and effort, but it should become part of a daily routine that both you and your teen can enjoy more than dread(担忧). Here are some tips that can help you.

1. 1 Know what classes he/she is taking, what your teen thinks of the teacher and/or ask if your teen feels he/she is learning anything. This is excellent dinner table conversation if you can keep it light and positive.

2. Set the expectations. 2 You would not do your teen any favors by not telling him/her what grades you will be expecting. Send a clear message to your teen about the grades you expect to see in each class. ____3____ Keep your expectations in line with what your teen feels he/she can do.

3. 4 While your teen will need to keep his/her goals in line with your expectations, he/she may have a goal that he/she feels is important too. Learning to establish goals teaches independence, one of the things your teen needs to learn to become a successful adult.

4. Have what they need at home, or a way to get it. 5 Your family should have library cards and a way to access the Internet for homework. Without these things, your teen could be at a disadvantage. It is also a good idea to set up a mobile homework center.

Finally, don’t forget to praise your teen for a job well done.

A. Help him/her establish goals.

B. Talk to your teen about school.

C. Learning in a classroom is a two-way street.

D. Resources are important for high school students.

E. Teens need a clear map of what you want them to do.

F. Set a good example and show him/her your love of learning.

G. Set consequences for poor grades as well as rewards for good grades.

查看答案和解析>>

科目：高中地理 来源： 题型：

【题目】A

阅读下面短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。

DOGS DRIVE CAR

Auckland, New Zealand

After two months of learning, Monty, and Porter were able to drive an automobile around a racetrack. ＂We wanted to prove how smart rescue dogs are,＂ animal behaviorist Mark Vette says. Vette first used voice commands and treats to teach the dogs how to turn a steering wheel and how to change gear (换挡).

The dogs’ ride only accelerated up to 7.5 miles an hour, and trainers could stop the auto using a remote control.

GOLDEN ZEBRA

Kailua-Kona, Hawaii

Zoe the zebra’s markings are special. The animal has white and golden stripes. Zoe’s appearance resulted from a rare condition called amelanosis (黑素缺失症). Her body doesn’t make enough melanin(黑色素), the substance in an animal’s skin and hair cells that produces color. ＂Only 25 other golden zebras are known to exist in the world,＂ says Ann Goody, who runs the wildlife refuge where Zoe lives. In the wild, life may be difficult for animals with amelanosis because predators (捕猎者) can easily spot them. But Zoe is protected at her refuge.

COCKATOO MAKES TOOLS

Vienna, Austria

When Figaro the cockatoo spots food lying just out of reach from his cage, he builds a tiny wooden tool to sweep the tasty prize in his way.

The bird first revealed his talent when a stone he was playing with rolled out of his cage. The cockatoo couldn’t reach the stone. So he flew away and returned with a small branch, slipping it through the fence to slide the stone toward him.

Wondering if he would do it again, scientists placed a nut exactly where the stone had been. This time, Figaro pulled out a small piece of wood in his cage and dragged the nut toward him.

【1】 If Zoe the zebra is set free in the wild, she will ___________.

A. meet no natural predators

B. not get along with other zebras

C. manage to make enough melanin

D. be easily found for her appearance

【2】What’s special about Figaro the cockatoo?

A. He is particular about his food.

B. He is extremely fond of stones.

C. He is good at drawing support from outside forces.

D. He can tell the difference between stones and nuts.

【3】What is the text mainly about?

A. Amazing animals.

B. Ways to help animals.

C. Animals’ unique talents.

D. Tips on training animals.

查看答案和解析>>

科目：高中地理 来源： 题型：

【题目】(2015·湖南) It is a truly delightful place, __________ looks the same as it must have done 100 years ago with its winding streets and pretty cottages.

A. as B. where C. that D. which

查看答案和解析>>

同步练习册答案