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n. (Ra) radioactive metallic chemical element
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|Wikipedia English The Free Encyclopedia||Download this dictionary|
Radium ( ) is a chemical element with atomic number 88, represented by the symbol Ra. Radium is an almost pure-white alkaline earth metal, but it readily oxidizes on exposure to air, becoming black in color. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226, which has a half-life of 1601 years and decays into radon gas. Because of such instability, radium is luminescent, glowing a faint blue.
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|WordNet 2.0 Dictionary||Download this dictionary|
1. an intensely radioactive metallic element that occurs in minute amounts in uranium ores
(synonym) Ra, atomic number 88
(hypernym) metallic element, metal
(substance-holonym) uranium ore
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n. radium, Rd, Ra, radioactive metallic chemical element (Chemistry)
|Babylon French English dictionary||Download this dictionary|
nm. radium, radioactive metallic chemical element
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