问题 问答题

某元素M的原子核内质子数与中子数相等,它形成气态氢化物在标准状况下的密度是1.518g/L,该氢化物0.5mol充分燃烧,生成9g水,则M的元素符号为______,原子序数是______,原子结构示意图为______,M的阴离子电子层结构与______等微粒相同.

答案

M形成气态氢化物在标准状况下的密度是1.518g/L,则M的相对分子质量为22.4×1.1518=34,该氢化物0.5mol充分燃烧,生成9g水,即n(H2O)=

9g
18g/mol
=0.5mol,1mol该氢化物含H:2×2×0.5mol=2mol,则1mol氢化物中M的质量为34g-2g=32g,即M的相对原子质量应为32,又M的原子核内质子数与中子数相等,则M的原子序数为16,应为S元素,

原子核外有3个电子层,最外层电子数为6,原子结构示意图为

,M的阴离子电子层结构为

,与M的阴离子电子层结构相同的微粒有等P3-、Cl-、Ar、K+、Ca2+

故答案为:S;16;

; P3-、Cl-、Ar、K+、Ca2+(任选一种).

阅读理解

     阅读理解。

     If someone says to you: "give me five", do not search your pocket to get five yuan! It will make others

  laugh! The person's not asking for your money, but your fingers.

     In the US, "give me five" or "give me the high five" is a popular gesture (动作). You can see it often in

 films or on TV. It means the slapping (拍) of each other's raised (举起的)  right hands together.

     People do it when they meet for the first time or something happy happens.  For example, a student

 has good marks in exams or wins a lottery ticket ( * * ). If a football team wins a game, the players will

 give high five to everyone around to celebrate.

     This gesture may come from the old Roman gesture of raising the right arm for the emperor (皇帝).

 This showed that the person raising his arm did not have a sword (JJ)  in his hand. Why not try to give

 the  high five to your friends?

1. "Give me five" is a gesture to _____.

    A. make people laugh                      

    B. ask for money

    C. celebrate success                    

    D. search one's pocket

2. The gesture "give me five" is the clapping of _____.

    A. toes          

    B. hands        

    C. arms          

    D. legs

3. When you _____, you give your friends high five.

    A. lose your money                          

    B. go back home

    C. win a football game                      

    D.  do badly in exams

4. The gesture started in _____ according to the story.

    A. Rome        

    B. America    

    C. China        

    D. Britain

5. Why did the Romans raise the right arm for the emperor? Because _____.

    A. they were proud of their emperor

    B. they were happy to see the emperor

    C. they wanted to show there were no swords in their hands

    D. we don't know

单项选择题