| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024stron•ti•um (stron′shē əm, -shəm, -tē əm),USA pronunciation n. [Chem.]- Chemistrya bivalent, metallic element whose compounds resemble those of calcium, found in nature only in the combined state, as in strontianite: used in fireworks, flares, and tracer bullets. Symbol: Sr; at. wt.: 87.62;
at. no.: 38;
sp. gr.: 2.6.
- stront(ia) + -ium 1800–10
Collins Concise English Dictionary © HarperCollins Publishers:: strontium /ˈstrɒntɪəm/ n - a soft silvery-white element of the alkaline earth group of metals, occurring chiefly in celestite and strontianite. Its compounds burn with a crimson flame and are used in fireworks. The radioisotope strontium-90, with a half-life of 28.1 years, is used in nuclear power sources and is a hazardous nuclear fall-out product. Symbol: Sr; atomic no: 38; atomic wt: 87.62; valency: 2; relative density: 2.54; melting pt: 769°C; boiling pt: 1384°C
Etymology: 19th Century: from New Latin, from strontian |