| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024tan•ta•lum (tan′tl əm),USA pronunciation n. [Chem.]- Chemistrya gray, hard, rare, metallic element occurring in columbite and tantalite and usually associated with niobium: used, because of its resistance to corrosion by most acids, for chemical, dental, and surgical instruments and apparatus. Symbol: Ta;
at. wt.: 180.948;
at. no.: 73;
sp. gr.: 16.6.
- Neo-Latin; named after Tantalus
- 1795–1805
Collins Concise English Dictionary © HarperCollins Publishers:: tantalum /ˈtæntələm/ n - a hard greyish-white metallic element that occurs with niobium in tantalite and columbite: used in electrical capacitors in most circuit boards and in alloys to increase hardness and chemical resistance, esp in surgical instruments. Symbol: Ta; atomic no: 73; atomic wt: 180.9479; valency: 2, 3, 4, or 5; relative density: 16.654; melting pt: 3020°C; boiling pt: 5458±100°C
Etymology: 19th Century: named after Tantalus, with reference to the metal's incapacity to absorb acids |