(10分)X、Y、W、Z是四种常见的短周期元素,其原子半径随原子序数变化如图所示

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问题:

(10分)X、Y、W、Z是四种常见的短周期元素,其原子半径随原子序数变化如图所示。已知X的一种核素的质量数为18,中子数为10,Y和Ne原子的核外电子总数相差1;W的单质是一种常见的半导体材料;Z的非金属性在同周期主族元素中最大。

(1)W位于元素周期表中第       周期第        族画出X的阴离子的结构示意图               

(2)Z的氢化物和溴化氢相比,较稳定的是           (写化学式);Z的氢化物与氟化氢相比,沸点较高的是             (写化学式)。

(3)Y的金属性与Mg的金属性相比,      (写化学式)的金属性强,请用实验证明它们金属性的相对强弱:                                         

(4)写出Y的最高价氧化物对应的水化物与Z的最高价氧化物对应的水化物发生反应的化学反应方程式                                     

考点:构成物质的粒子—分子、原子、离子元素周期律
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短文填空.

     About three years ago,I felt very lonely,I don't like my classmates,my parents or anyone else.My classmates didn't waIlt to talk      1     me and my parents were always saying that other kids were better than

me.I thought l was the      2      unlucky person in the world.

     One day I had a big fight with one of my classmates.I was so angry       3      I hit him in tlle face.Just at that moment,a boy stood up and       4       the 6ght.He was tlle monitor of our class.

     Afer that,he often helped me aIld we became good       5      .Whenever I got angry or sad,he would

help      6     to coo1 down. My life began to change because of the boy,my best friend.We spent a lot of

interesnng days together.As         7       goes by,I have become happier with people and things.And

it        8    that people around me have changde, too. My parents don't shout at me       9     more and my classmates become friendly to me. 

     But now I can't often see my best friend because he is seriously       10       and is staying in hospital.

How I miss the days when we were together!I hope he will be all right and come back to school soon.

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远期外汇业务

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根据储层有效孔隙度的大小,将储集层物性划分为五类,有效孔隙度为()%的储集层可划分为中等物性储集层。

A.5-10

B.10-15

C.15-20

D.20-25

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投保时指定驾驶人,保险事故发生时为非指定驾驶人使用被保险机动车的,可拒赔。

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要实现网络通信必须具备三个条件,其中不包括()。

A、网络接口卡

B、网络协议

C、网络操作系统及实用程序

D、网络服务器

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