单词 | actinium |
释义 | actinium (once / 241211 pages) n WORD FAMILY actinium USAGE EXAMPLESActinium, one of the radioactive substances, is said to have a chemical activity which is about a thousand million times swifter than that of radium. Swain, Richard la Rue, What and Where is God?—A Human Answ...(2011) Actinium, an element or elementary substance obtained in minute quantities in connection with the study of radioactivity. Various, The New Gresham Encyclopedia. Vol....(2010) Further, it became clear from the investigation of uranium minerals that radium, polonium, actinium, and ionium originated from uranium. Venable, Francis Preston, A Brief Account of Radio-activity(2010) n a radioactive element of the actinide series; found in uranium ores Syn|Hyper Ac, atomic number 89 chemical element, element any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
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