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Radium is a bright, silvery, soft and radioactive metallic element with atomic number 88 and chemical symbol Ra, located in the alkaline earth metals group of the periodic table. Classification and Fundamental Properties Radium is an alkaline earth metal found in group 2A (group 2) of the seventh period of the periodic table. Its electron configuration is [Rn]7s², with two valence electrons in its outermost shell. It tends to readily lose these electrons to form +2 ions (Ra²⁺) in its compounds.