In chemistry class, we learned about the element with the symbol Fe. What does Fe stand for? A. Fluorine element B. Iron element C. Iodine element D. Francium E. lement 相关知识点: 试题来源: 解析 B。Fe 是铁元素(Iron element)的化学符号。反馈 收藏 ...
What immediatelycatches the careful reader's eyeis thatthe term elementis applied only to the first class of substances, and throughout the book only the members of this category are calledelements or principles, the other members of the table being called either simple bodies or “oxydable or...
Some of these are and less toxic than the monomer, is a common centred with Ni, some centred with the main group starting material for the preparation of other element and others uncentred. clusters,(34) many of which are stabilized by Reductions of [Ptc16]2- in an atmosphere of ...
element/ˈelɪmənt/ 1. noun [countable] a necessary or typical part of sth 要素;基本部分;典型部分 2. [countable, usually singular]少量;有点;有些 ;~ of surprise, risk, truth, etc. 3. Chemistry 化学 [countable] 元素(如金、氧、碳) 4. [countable] one of the four substances: e...
The ground-state electronic configuration of each element in the group is ns2np3 with an unpaired electron in each of the three p orbitals, and much of the chemistry of the group can be interpreted directly on this basis. However, smooth trends are sometimes modified (or even absent ...
化学元素英文介绍chemistry of the elements33654_03b.pdf,38 Hydrogen Ch. 3 on an industrial scale when integrated with the chloralkali industry (p. 798). Other bulk pro- cesses involve the (endothermic) reaction of steam on hydrocarbons or coke: 1100°C CH
本题主要考查过去分词作定语。分析句子后可知主语为 the element radium,谓语是 gave off,___ in the chemistry lab 是插入语,在句中充当定语。因为 the element radium 和 discover 是被动关系,所以排除C、D项,B项意为“将被发现(还未发现)”,故正确答案为A。反馈 ...
The element radium, ___ in the chemistry lab, gave off a faint blue light. A. discovered B. to be discovered C. to discover D. discovering 相关知识点: 试题来源: 解析 A 【详解】 考查非谓语动词。句意:在化学实验室里发现的元素镭发出微弱的蓝光。分析句子可知,空处缺少非谓语动词,“元素镭”...
[TiC14(diars)2] (Fig. 21.5) was in fact one of the first examples of an 8-coordinate complex of a first-row transition element. The terdentate arsine, MeC(CHzAsMe2)3, forms a 1:1 968 Titanium, Zirconium and Hafnium Ch. 21 adduct with Tic14 which is monomeric and so presumably 7...
partic- The crucial experiment suggesting that the ularly in the pz-mode and to some extent in the H2 molecule might act as a dihapto ligand p3-mode, one or more of the M can represent a to transition metals was the dramatic obser- main-group element such as B, Al; C, Si; N etc...