| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024po•lo•ni•um (pə lō′nē əm),USA pronunciation n. [Chem.]- Chemistrya radioactive element discovered by Pierre and Marie Curie in 1898;
Symbol: Po;
at. no.: 84;
at. wt.: about 210.
- Medieval Latin Polonia Poland) + -ium -ium
- Neo-Latin, equivalent. to polon- (
- 1895–1900
Collins Concise English Dictionary © HarperCollins Publishers:: polonium /pəˈləʊnɪəm/ n - a very rare radioactive element that occurs in trace amounts in uranium ores. The isotope polonium-210 is produced artificially and is used as a lightweight power source in satellites and to eliminate static electricity in certain industries. Symbol: Po; atomic no: 84; half-life of most stable isotope, 209Po: 103 years; valency: –2, 0, 2, 4, or 6; relative density (alpha modification): 9.32; melting pt: 254°C; boiling pt: 962°C
Etymology: 19th Century: New Latin, from Medieval Latin Polōnia Poland; named in honour of the Polish nationality of its discoverer, Marie Curie |