Nature, most elements have two or more isotopes, the same kinds of elements in the quality of the various isotopes of different, but the types and proportion constant (except for radioactive elements). In 1961, the carbon content of the most abundant in nature, a kind of isotope, carbon-12 atom of a quantity and quality of C as a 12 mass units to it as "benchmarks" for all isotopes of an element according to the average abundance The ratio of the benchmark is the atomic weight of this non-prime, that is listed in the periodic table of atomic weights.

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The MS showed that the ratio of relative abundance ratio of two main Se isotopes is about 2:1, which can give important information for identifying molecular or fragile ions of selenium.

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Its isotopes, all radioactive, are highly toxic radiological poisons because they give off alpha particle s and are specifically absorbed by bone marrow.

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History of each element, atomic number, symbol, electron configuration, isotopes, its properties and its cost.

提供每個元素的基本信息、同位素免费看的国产区视频、價值和歷史男女无遮挡性爱视频。

Isotopes have the same atomic number but different mass numbers.

同一元素的同位素有相同的原子序數(shù)不同的質(zhì)量數(shù)。

We summarize the study of geochemistry of the Co rich crust, and explain the diffusion of elements in the Co rich crust and the exchange with ambient seawater. Besides, we discuss the effect of phosphatization and substrate rocks on the composition of the Co rich crust. We also introduce the application of stable isotopes (including the stable isotopes of Pb, Nd, and Hf), radioactive...

概述了富鈷結(jié)殼地球化學(xué)的研究成果闡述了富鈷結(jié)殼中元素的擴散及與周圍海水的交換波多野结衣性爱视频，基巖和磷酸鹽化事件對富鈷結(jié)殼組成的影響分別介紹了穩(wěn)定同位素(Pb2020精品极品国产色在观看、Nd和Hf的穩(wěn)定同位素)、放射性同位素(Be国产精品免费一区二区久久、U和Th的放射性同位素)及元素(常量和微量元素88888888视频欧美、稀土元素)在富鈷結(jié)殼古海洋學(xué)研究上的應(yīng)用。

This paper discusses the research carried out on the Lake Sugan, in the northern margin of Chaidam Basin. The climate and environmental changes in Lake Sugan drainage area over the past 2670 years were studied using the varve dating of the well preserved lamination sediments in core SG03I taken from the center of Lake Sugan, the study of varve formation in modern lake system and modern process study of carbonate and oxygen isotopes of the water within the drainage area, and according to the main index of the stable isotopes of carbonate sediments synthesized other index analysis.

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More recently, other isotopes have been made at the paul scherrer institute in switzerland using neon atoms to bombard californium isotopes.

最近999国产精品欧美久久久久久，其他同位素已在保羅scherrer研究所(35/12)在瑞士用氖原子轟擊锎的同位素。

Based on the study of rock textures and structures, and stable isotopes of dolomite and S isotope of barite interlayers within the cap dolomite outcropped in the Miaohe area in the Three Gorge, it is testified that the stable isotopes show a strong negative excursion, and the isotopes of sulfur show a significant positive excursion, which is similar to the reported data of authigenic barites formed in a modern seafloor gas hydrate environment. Therefore, it can be concluded that the cap dolomite was most likely formed in a special environment under which a huge gas hydrate dissociated with the breakup of "Snow Earth" in later Neoproterozoic.

通過對湖北三峽廟河地區(qū)出露的&蓋帽&白云巖的野外地質(zhì)構(gòu)造JIZZ日本国产大陆内射极品、碳－氧穩(wěn)定同位素和重晶石夾層的硫穩(wěn)定同位素特征的研究日韩亚洲欧美高清专区，發(fā)現(xiàn)除了明顯的碳穩(wěn)定同位素的負(fù)偏移之外，重晶石的硫同位素值表現(xiàn)出明顯的正偏移55夜色66夜色国产精品视频，其數(shù)值可與現(xiàn)代海底甲烷噴氣孔附近的自生重晶石礦物的同位素組成相對比国产成年一级女人侧拍，進(jìn)而認(rèn)為&蓋帽&白云巖的成因是末元古代&雪球&事件之后天然氣水合物的釋放與全球環(huán)境突變背景下的沉積產(chǎn)物。

Most elements found in nature are mixtures of several isotopes; tin, for example, has 10 isotopes.

自然界里的大多數(shù)元素都是幾種同位素的混合A毛片在线导航；例如錫女人18毛片一级毛片亚洲，有十種同位素。