Radium

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Radium (play /ˈrdiəm/ RAY-dee-əm) is a radioactive chemical element which has the symbol Ra and atomic number 88. Its appearance is almost pure white, but it readily oxidizes on exposure to air, turning black. Radium is an alkaline earth metal that is found in trace amounts in uranium ores. Its most stable isotope, 226
Ra
, has a half-life of 1601 years and decays into radon gas.

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