Which element is in Group 17 and has 7 valence electrons? A. Fluorine B. Chlorine C. Bromine D. All of the above 相关知识点: 试题来源: 解析 D。解析:氟(Fluorine)、氯(Chlorine)、溴(Bromine)都属于第17族(卤族元素),它们的最外层都有7个电子,所以这三个选项都正确,答案为D。
A positive resist composition comprising (A) a fluorine group-containing resin, which has a structure substituted with a fluorine atom in the main chain and/or side chain of polymer skeleton and a group that is decomposed by the action of an acid to increase solubility in an alkali developer...
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is chosen from the group which consists of the halogenation hydrocarbon and the hydrocarbon, R and R'to as for one side includes fluorine at least, a and d are integer of 1 - 3, b, c, e and f are integer 0 - 2, a, b and c total are 3, the total of d, e and f is 3....
申请(专利权)人: 住友金属工業株式会社 发明人: 市川 賢治 摘要: PROBLEM TO BE SOLVED: To provide a method of manufacturing blast furnace granulated slag by which the concentration of fluorine eluted from the blast furnace granulated slag is decreased to ≤0.8 mg/L.收藏...
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. As a result, there is a desire for fluorine-containing compositions which are effective in providing desired surfactant properties, and which eliminate more effectively from the body (including the tendency of the composition and its degradation products). It is expected that the fluorochemical ...
In a group of this subclass R14 and R19 are independently H, acyl or alkylsulfonyl, R15 and R16 is preferably H and R5 is H or lower alkoxy. In one subclass of preferred compounds are compounds, wherein R2 and R3 are independently H or halogen. Fluorine is the preferred halogen. In ...
In LyRuXz type, as for L, direct, branching chain, or hydrocarbyl of cyclic type, cyclic alkene, diene and cyclic diene, trien and cyclic trien, two cyclic alkenes, two cyclic triens, tricyclic alkene, tricyclic diene, tricyclic trien; Those fluorine conversion derivatives; For example the ...
The benzene derivative which to fluorine is converted partly and the benzene (57)< Abstract > The benzenederivative where the below-mentioned formula I (however in this formula R and A, A, Q, Y and L, L, L and as for m defined in range 1 of claim, as, is,) partly to fluorine ...