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brevium: see protactinium protactinium , radioactive chemical element; symbol Pa; at. no. 91; at. wt. 231.0359; m.p. greater than 1,600°C;; b.p. 4,026°C;; sp. gr. 15.37 (calculated); valence +4, +5. Protactinium is a malleable, shiny silver-gray radioactive metal.
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