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Radium is the heaviest alkaline earth metal; its chemical properties mostly resemble those of barium. When exposed to air, radium reacts violently with it, forming radium nitride,[1] which causes blackening of this white metal. It exhibits only +2 oxidation state in solution. Radium ions do not form complexes easily, due to highly basic character of the ions. Most radium compounds coprecipitate with all barium, most strontium, and most lead compounds, and are ionic salts. The radium ion is colorless, making radium salts white when freshly prepared, turning yellow and ultimately dark with age owing to self-decomposition from the alpha radiation. Compounds of radium flame red-purple and give a characteristic spectrum. Like other alkaline earth metals, radium reacts violently with water and oil to form radium hydroxide and is slightly more volatile than barium, which leads to lesser solubility of radium compounds compared to those of corresponding barium ones. Because of its geologically sh

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RadiumFrom Wikipedia, the free encyclopediaJump to: navigation, search This article is about the chemical element. For other uses, see Radium (disambiguation).This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (January 2011)francium radium actiniumBaRaUbn88RaPeriodic tableAppearancesilvery white metallicGeneral propertiesName, symbol, numberradium, Ra, 88Pronunciation/redim/ray-dee-mElement categoryalkaline earth metalGroup, period, block2,7, sStandard atomic weight(226)Electron configuration[Rn] 7s2Electrons per shell2, 8, 18, 32, 18, 8, 2 (Image)Physical propertiesPhasesolidDensity (near r.t.)5.5 gcm3Melting point973K,700C,1292FBoiling point2010K,1737C,3159FHeat of fusion8.5 kJmol1Heat of vaporization113 kJmol1Vapor pressureP (Pa)1101001 k10 k100 kat T (K)8199061037120914461799Atomic propertiesOxidation states2 (strongly basic oxide)Electronegativity0.9 (Pauling scale)Ionization energies1st: 509.3 kJmol12nd: 979.0 kJmol1Covalent radius2212 pmVan der Waals radius283 pmMiscellaneaCrystal structurebody-centered cubicMagnetic orderingnonmagneticElectrical resis

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