| 词汇 | example_english_actinium |
| 释义 | Examples of actiniumThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. Secondary decay products of thorium include radium and actinium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Owing to its scarcity, high price and radioactivity, actinium has no significant industrial use. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The actinide series derives its name from the group 3 element actinium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The new name meant parent of actinium and reflected the fact that actinium is a product of radioactive decay of protactinium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The former reaction is carried out at room temperature, by adding hydrofluoric acid to a solution containing actinium ions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Chemically, actinium is similar to lanthanum, which is explained by their similar ionic radii and electronic structure. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Actinium is mostly present in uranium-containing, but also in other minerals, though in much smaller quantities. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. All actinides are radioactive, paramagnetic, and, with the exception of actinium, have several crystalline phases: plutonium has seven, and uranium, neptunium and californium three. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The fourth element, either actinium or lawrencium, has only radioactive isotopes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Several isotopes of bismuth with short half-lives occur within the radioactive disintegration chains of actinium, radium, and thorium, and more have been synthesized experimentally. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. After the synthesis, actinium is separated from radium and from the products of decay and nuclear fusion, such as thorium, polonium, lead and bismuth. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Beginning with naturally occurring thorium-232, this series includes the following elements: actinium, bismuth, lead, polonium, radium, and radon. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Elements 121 and 122 should be homologs of actinium and thorium, respectively. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Actinium reacts rapidly with oxygen and moisture in air forming a white coating of actinium oxide that impedes further oxidation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The major difficulty in separation of actinium is the similarity of its properties with those of lanthanum. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The first element of the actinides, actinium gave the group its name, much as lanthanum had done for the lanthanides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. He identified the half-lives of the uranium-actinium row and thorium nuclides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Perey then attempted to determine the proportion of beta decay to alpha decay in actinium-227. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Giesel, on the other hand, can rightfully be credited with the first preparation of radiochemically pure actinium and with the identification of its atomic number 89. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Actinium also has two meta states. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Owing to its strong radioactivity, actinium glows in the dark with a pale blue light, which originates from the surrounding air ionized by the emitted energetic particles. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The strongest base is of actinium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The radioactive decay of uranium produces transient amounts of actinium and protactinium, and atoms of neptunium, americium, curium, berkelium and californium are occasionally produced from transmutation reactions in uranium ores. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Scandium and yttrium are always classified as group 3 elements, but it is controversial which elements should follow them in group 3, lanthanum and actinium or lutetium and lawrencium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Most of the chemistry has been observed only for the first three members of the group; chemical properties of both actinium and especially lawrencium are not well-characterized. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Actinium-225 is less available than actinium-228, but is more promising in radiotracer applications. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Ac, the radiation from the actinium and its decay products might induce new mutations. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. One tonne of uranium ore contains about 0.2 milligrams of actinium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. He tested for elements below uranium in the periodic table: radon, actinium, polonium, as far back as lead it was none of these. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Actinium has similar chemical properties as lanthanum and other lanthanides, and therefore these elements are difficult to separate when extracting from uranium ores. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A soft, silvery-white radioactive metal, actinium reacts rapidly with oxygen and moisture in air forming a white coating of actinium oxide that prevents further oxidation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Polonium, radium and radon were observed before actinium, but they were not isolated until 1902. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Ac was that intravenous injection of simple actinium complexes resulted in their accumulation in the bones and liver for a period of tens of years. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The actinide series comprises the elements from actinium to lawrencium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Polonium-208 and actinium-227 were also considered as alpha sources. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The most abundant, or easy to synthesize actinides are uranium and thorium, followed by plutonium, americium, actinium, protactinium and neptunium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When actinium trichloride is administered intravenously to rats, about 33% of actinium is deposited into the bones and 50% into the liver. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Ac one tonne of ore contains about 0.2 milligrams of actinium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The close similarity of physical and chemical properties of actinium and lanthanum makes separation of actinium from the ore impractical. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Actinium-227 (half-life 21.8 years) in turn decays via thorium-227 (half-life 18.7 days) to radium-223. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
反思网英语在线翻译词典收录了377474条英语词汇在线翻译词条，基本涵盖了全部常用英语词汇的中英文双语翻译及用法，是英语学习的有利工具。