| LC control no. | sh 85110804 |
|---|---|
| LC classification | QD181.R1 General and inorganic chemistry QD412.R1 Organometallic chemistry QE516.R1 Geochemistry TN948.R3 Ores TP245.R2 Chemical technology |
| Topical heading | Radium |
| See also | Alkaline earth metals Radioactive substances |
| Found in | Wikipedia, Oct. 12, 2012 (Radium is a chemical element with symbol Ra and atomic number 88. 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. Radium, in the form of radium chloride, was discovered by Marie Skłodowska-Curie and Pierre Curie in 1898.) |
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