- Radio (Metal)
Radio (Metal) (Tema)
- Radio (elemento)
- Ra
- Encabezamiento genérico: Metales alcalinotérreos
- Encabezamiento genérico: Sustancias radioactivas
- Radón
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.) https://es.wikipedia.org/wiki/Radio_(elemento)
Radium, 2009.