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periodic table 【化學】元素周期表。

However , such an “ anti - periodic table of elements “ is thought to be , at best , highly unlikely , as the quantities of antimatter required would be , quite literally , astronomical 然而,如此的一個被想象的“元素反周期表” ,充其量,可能性不大,照字面上理解如同必需的反物質的量會是大得無法估計那樣。

However , such an “ anti - periodic table of elements “ is thought to be , at best , highly unlikely , as the quantities of antimatter required would be , quite literally , astronomical 然而,如此的一個被想象的“元素反周期表” ,充其量,可能性不大,照字面上理解如同必需的反物質的量會是大得無法估計那樣。

periodic yield

Moreover , the quenching concentration of eu is raised . on the basement of successful synthesis of two - components oxide , edta complexing sol - gel method was expanded and applied to effectively synthesis nanosized muti - components oxide , such as la1 - xsrx fe o3 , lafe1 - xcuxo3 , la1 - xsrx coo3 , laco1 - xcuxo3 because edta can bind with most metallic elements of the periodic table , this technique become a versatile tool in the production and study of new nano materials of multi - component complex oxides . a economic and new process has been studied to synthesis la2o3 nanocrystalline , using nh4hco3 as precipitant 河北大學理學博士學位論文對于單一組份的稀土氧化物,探索出一條更經濟、更方便的合成方法,即:用碳酸氫錢做稀土沉淀劑,成功地制備了納米l匆03 ,并對中間產物碳酸斕及其燒成的氧化斕分別進行了ir 、 tg一dta 、 sem 、 xrd分析研究,確定了碳酸憫的組成,氧化斕的物相、結構,并發現分散劑的種類對微觀形貌有一定的影響。

The boundary radius of an atom ( ion ) is defined by the classical turning point equation ( ( r ) = - i , where i denotes the first ionization potential of the atom ( ion ) . the boundary radii of atoms and ions of elements from first - to fifth - row in the periodic table are obtained 對于中性原子,假設此時的能量等于其第一電離能i的負值,即v ( r ) = - i 。我們定義原子核到r的距離為原子的內稟邊界半徑,簡稱為邊界半徑。

What about the entire periodic table ? that exercise is trickier because you have to arrange the data into the familiar format based on group and period , which requires some fancy coding . you can t just place the components in fixed positions 這個練習需要更多技巧,因為要按照分組和周期將數據排列成常見的格式,所以需要某些具有想像力的代碼,不能簡單地將各部分放在固定的位置。

This is an interesting periodic table of elements with pictures provided at the matching position of every element . it introduces to visitors various elements and relevant basic knowledge through the performance of a multi - media cartoon 這是一張趣味元素周期表,表中在每個元素相應位置上都配有圖片,通過多媒體動畫演示向觀眾介紹各個元素及與其相關的基本知識。

In the 19th century , when scientists were feeling their way towards big concepts such as the laws of thermodynamics , electromagnetics and the periodic table without really knowing what they were looking for , that was normal 在19世紀,科學家們在沒有意識到他們的研究目的的情況下而發現了諸如熱電學定理、電磁學和元素周期表之類大的科學定理是很正常的。

In doing so , they have shown that the predictions of chemistry ' s central blueprint , dmitri mendeleev ' s periodic table , extend reliably into the realm of heavy , short - lived , radioactive elements that do not exist in nature 在這些工作中,他們顯示預測化學的主要藍圖:門捷列夫的元素周期表,即拓展自然界不存在的但可信賴的重的,短期,放的射性的元素。

These compounds pair one or more elements from the third column of the periodic table ( such as aluminum , gallium or indium ) with an element from the fifth column ( typically phosphate , arsenic or antimony ) 這些化合物將周期表第三欄里的一種或多種元素(例如鋁、鎵或銦)與第五欄里的一種元素(通常是磷、砷或銻)配在一起。

The jury commended on the siting of the building and gave appraisal to the experimental direction of adopting the concept of the periodic table in chemistry to the coloured faade 評審團特別提及大樓的地形環境,對于建筑師采取了實驗性的設計手法,將元素周期表表現在色彩豐富的大廈外墻上,予以高度評價。

Discussion boards for all areas of chemistry , at levels ranging from high school to graduate school and practicing chemists . site also includes web directory , periodic table , articles , and reference tables -提供化學相關的知識與教學過程中所用的化學課件教案試題,為廣大教師學生提供一個交流的平臺

However , such an “ anti - periodic table of elements “ is thought to be , at best , highly unlikely , as the quantities of antimatter required would be , quite literally , astronomical 然而,如此的一個被想象的“元素反周期表” ,充其量,可能性不大,照字面上理解如同必需的反物質的量會是大得無法估計那樣。

The element silicon is so closely identified with computers that most people would be likely to associate it more readily with california ` s high - tech valley than with the periodic table 硅元素與計算機的關系如此密切以至于大多數人可能更容易將它與加利福尼亞的硅谷而不是元素周期表聯系起來。

Now scientists are poised to oblige the producers of that perennial classroom classic , the periodic table , to issue an updated version 現在科學家們終于可以泰然自若地喊制作人去推出那些一成不變地掛在教室中的元素周期表的升級版本。

I was thinking about doing something on the periodic table . we can chart when each element was discovered and show how it affected society 我在考慮做一個元素周期表,把已知的所有元素都列出來,然后展示它們如何影響當今社會

As for updating the periodic table , element 118 would slot in just below radon in the column that contains inert gases 至于元素周期表的升級, 118號元素的位置就在氡列那些氣體元素之后。

Webelements aims to be a high quality source of chemistry information on the www relating to the periodic table 該元素周期表旨在互聯網上提供關于元素周期表的高質量化學信息源。

This book , which was a simple outline of the periodic table and atomic structure , impressed me greatly 這本書簡明地概述了元素周期表和原子的結構,給我留下了極為深刻的印象。

As generations of chemistry teachers have laboured to convey , the periodic table consists of rows and columns 就如世代化學老師辛苦的傳授,元素周期表是由行和列組成。