| 单词 | astatine |
| 例句 | These are the elements fluorine, chlorine, bromine, iodine, and astatine. Chemistry 2019-02-14T00:00:00Z The astatine nightmares wake me, sweating, from sleep, linger briefly and disperse in the morning light. Halogen nightmares 2020-09-01T04:00:00Z Indeed it appears that he may well have been the discoverer of naturally occurring astatine, as it was later called by the physicists who synthesized the element artificially. A Tale of 7 Elements: Element 85 Astatine [Excerpt] 2013-07-05T14:15:00.623Z The measurement fills in a missing piece of the periodic table of elements, because astatine was the last naturally occurring element for which this property was unknown. Physicists Find Way to Measure Earth's Rarest Element 2013-05-17T17:15:00.217Z Americans were generally absent from the race until well into the twentieth century, and it was not until 1940 that the first American-discovered element, astatine, was announced by a team at Berkeley. Globalism and Technology: A Hidden Misconception That Dooms the U.S. Economy 2013-03-31T08:47:56Z A number of artificial elements, including technetium, astatine, and the transuranium elements, have been produced in this way. Chemistry 2019-02-14T00:00:00Z I don’t know what the astatine nightmares are. Halogen nightmares 2020-09-01T04:00:00Z Furthermore, Paneth, who was by now the chair of the committee of the International Union of Chemistry, approved the name of astatine in 1949, thus further lending his support to the American claim. A Tale of 7 Elements: Element 85 Astatine [Excerpt] 2013-07-05T14:15:00.623Z The collisions created a shower of new particles, some of which were astatine. Physicists Find Way to Measure Earth's Rarest Element 2013-05-17T17:15:00.217Z In the early 1950s, he belonged to a team of physicists credited with discovering the radioactive element astatine. Dale Corson, Cornell Administrator Who Helped Quell Protest, Dies at 97 2012-04-06T02:44:26Z Astatine was first made at Berkeley by bombarding bismuth with alpha particles, which produced astatine and released two neutrons. A Brief History of Element Discovery, Synthesis, and Analysis There are no stable isotopes of astatine; all decay with half-lives in the order of hours at the most, seconds to minutes for the most part. Halogen nightmares 2020-09-01T04:00:00Z In 1943, three years after astatine was first synthesized artificially in a nuclear reactor, it was discovered that the element occurs naturally in miniscule amounts in the earth’s crust. A Tale of 7 Elements: Element 85 Astatine [Excerpt] 2013-07-05T14:15:00.623Z This element, the second-heaviest ever created, is a homologue of astatine, meaning that it sits right below astatine on the periodic table and likely shares similar properties. Physicists Find Way to Measure Earth's Rarest Element 2013-05-17T17:15:00.217Z The possible medical isotopes of astatine are not so different in this respect. Physicists Find Way to Measure Earth's Rarest Element 2013-05-17T17:15:00.217Z |
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