五种短周期元素D、E、F、X、Y、Z的原子序数依次增大,D、E两元素最高正价与最

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问题:

五种短周期元素D、E、F、X、Y、Z的原子序数依次增大,D、E两元素最高正价与最低负价之和均为0,E元素的一种同位素常用于考古断代,D和X同主族,F和Y同主族,F的多种化合物可用作化肥,豆科植物的根瘤菌可将其单质转化为化合物,X和Z形成的二元化合物是厨房常用的调味品。回答下列问题:

(1)①E元素在元素周期表中的位置是_______________。

②由D和F,Y,Z所形成的最简单常见共价型化合物中,热稳定性最差的是__________(用化学式表示,下同);还原性最强的是_____________。

③F、X、Z形成的简单离子半径从大到小顺序为_________________(用离子符号表示)

④D、F、Z形成一种离子化合物,写出它的电子式________________________。

(2)①2012年,罗马大学科学家制造出F4分子,则F4和F2两种单质的关系是____________。

②F、X形成的一种二元离子化合物具有非常强的爆炸性,该物质中X的质量分数是35.38%,,则该物质的化学式为___________。

③Z单质和FD3发生置换反应,观察到有大量白烟生成,写出该反应化学方程式__________,反应中氧化剂和还原剂物质的量之比为____________________。

考点:构成物质的粒子—分子、原子、离子元素周期律
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Every Object Tells a Story凡事皆有戏
Everyone has a particular object to which they attach a special meaning or story. Every Object Tells A (1) is a participative website that enables people to explore the stories and meanings behind collections of museum objects. (2) to the site can create their own stories and share their own interpretations and objects online.
The project (3) on the art of storytelling and involves four regional museums, in partnership with Channel 4 and Ultralab, a (4) technology research centre at Anglia Polytechnic University. It will be led by the Victoria and Albert Museum. It (5) the personal meanings and histories behind objects to get people to look at them in new ways. It (6) designed to inspire them to create their own stories and share their interpretations and objects of personal significance (7) a growing online community.
Video, audio, text and pictures combine on the site to offer an enticing, accessible (8) into the content. Users can choose to browse the hundreds of objects featured, or they can search for (9) particular theme or person. They can decide on the level of information they want on an object, from (10) stories conveyed through text and pictures, to the richer experience offered by accompanying video and audio. They will (11) encouraged to add their own interpretation or object to the collection, by uploading text, images, video or audio (12) the site or by sending text and images from a mobile phone. In so doing, they will be (13) to the website’s content and illustrating how a single object can convey different meanings to different people.
The (14) stories and wonderful objects will appeal to a broad audience. The project has specific relevance to all key (15) of the National Curriculum in English and literacy. Outreach sessions in regional partner museums will encourage people to (16) involved in the project locally and a video booth will travel around England, visiting shopping centres, libraries, bus (17) and the like, to enable people to capture their object and story in a short video. This will (18) be uploaded onto the site.
In addition to the national and local publicity given to the project, Channel 4 (19) promote the website from a number of its programmes, ensuring a wide appeal and providing an added (20) for people to contribute their content.

题型:填空题

气陷证可见的症状是()

A.刺痛拒按,固定不移,舌暗,脉涩

B.气短疲乏,脘腹坠胀,舌淡,脉弱

C.胸胁胀闷窜痛,时轻时重,脉弦

D.面色淡白,口唇爪甲色淡,舌淡,脉细

E.少气懒言,疲乏无力,自汗,舌淡,脉虚

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在这种情况下可以借右侧公交车道超车。

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材料质量检验程度分为()。

A.免检 

B.自检 

C.抽检 

D.专家检验 

E.全检 

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下列不属于应对通货膨胀的措施的是()。

A.提高存款准备金率

B.加息

C.人民币升值

D.提高税率

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