Germany. They called the element ‘brevium’ because the isotope they had found (protactinium-234) has a very short half-life (1.17 minutes).(1),(2)
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Protactinium, element 91, is one of the most rare of the naturally occurring elements and may well be the most difficult of all to extract from natural sources. Protactinium is, formally, the third element of the actinide series and the first having a 5f electron. The superconducting ...
美[ˌproʊtækˈtɪniəm] 释义 n. 镤 英英释义 Noun 1. a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead 行业词典 医学 镤:放射性金属元素,与镭同时存在于沥青铀矿、钾钒铀矿或其他矿中原子量231原子序数91,化学符号Pa...
This mineral, Torbernite, appears in my Photographic Periodic Table Poster representing protactinium, because this highly unstable element can't reasonably be photographed. The rock probably contains on the order of a few atoms of protactinium at any one time, as part of the complex decay chain ...
Related to Protactinium-231: Element 91pro·tac·tin·i·um (prō′tăk-tĭn′ē-əm) n. Symbol Pa A rare, extremely toxic, radioactive, lustrous, metallic element having more than 30 known isotopes and isomers, the most common of which is Pa-231 with a half-life of 32,760 years...
英文-新共同语言字典 noun protactinium (element) Disionario de Lingua Franca Nova a engles 显示算法生成的翻译 带有“protactinium"的图片 添加示例 在上下文、翻译记忆库中将“protactinium"翻译成 新共同语言 变形干 找不到示例,请考虑添加一个示例。
protactinium 英 [ˌprəʊtækˈtɪniəm] 美 [ˌproʊtækˈtɪniəm]n. 镤(放射性化学元素)牛津词典 noun 镤（放射性化学元素）a chemical element. Protactinium is a radioactive metal found naturally...
(Elements & Compounds) a toxic radioactive metallic element that occurs in uranium ores and is produced by neutron irradiation of thorium. Symbol: Pa; atomic no: 91; half-life of the most stable isotope,231Pa: 32 500 years; valency: 4 or 5; relative density: 15.37 (calc.); melting pt...
These natural uranium isotopes decay into the element thorium, which in turn decays into protactinium, and each has its own isotopes. Artemis Spyrou, The Conversation, 24 May 2022 Word History Etymology New Latin First Known Use 1918, in the meaning defined above Time Traveler The first known...