名詞 radium:

1. an intensely radioactive metallic element that occurs in minute amounts in uranium ores
   同義詞：Ra, atomic number 88

1. Tell me when radium was found.
   告訴我鐳是什么時(shí)候被發(fā)現(xiàn)的。
2. Radium and uranium are radioactive elements.
   鐳和鈾是放射性元素。

ra.di.um

n.Symbol Ra （名詞）符號(hào) Ra
A rare, brilliant white, luminescent, highly radioactive metallic element found in very small amounts in uranium ores, having 3 isotopes with mass numbers between 23 and 230, of which radium 22' with a half-life of ,'22 years is the most common. It is used in cancer radiotherapy, as a neutron source for some research purposes, and as a constituent of luminescent paints. Atomic number 88; melting point 700=C; boiling point ,737=C; valence 2.See table at element
鐳：一種稀有的、有白色光澤、發(fā)光、高度放射性的金屬元素，極少量地存在于瀝青礦中，有3種同位素，質(zhì)量數(shù)介于23和230之間，最常見(jiàn)的為鐳22'，半衰期為,'22年。鐳可用于癌癥的放射治療，在其它一些研究中用作中子源，還可用作發(fā)光顏料的成分。原子序數(shù)88；熔點(diǎn)700=C；沸點(diǎn),737=C；原子價(jià)2參見(jiàn) element

來(lái)源：
Latin radius [ray]
拉丁語(yǔ) radius [射線]
-ium
-ium