Praseodymium(III) Bromide
Praseodymium(III) bromide is a crystalline compound of one praseodymium atom and three bromine atoms. Characteristics Appearance Praseodymium(III) bromide is a green solid at room temperature. It is usually handled as a powder. Physical Praseodymium(III) bromide's molecular weight is 380.62 g. Praseodymium bromide has a density of 5.28 g/cm2. adopts the crystal structure. The praseodymium ions are 9-coordinate and adopt a tricapped trigonal prismatic geometry. The praseodymium–bromine bond lengths are 3.05 Å and 3.13 Å. Chemical Praseodymium(III) bromide is hygroscopic. Praseodymium(III) bromide has an oxidation number of 3. Hazard Praseodymium(III) bromide can cause skin irritation (H315/R38), eye irritation (H319/R36), and that breathing dust/fume/gas/mist/vapours/spray of Praseodymium(III) bromide should be avoided (P261/S23), that one should wash hands thoroughly after handling (P264), one should wear protective gloves and clothes clothing, and wear eye protecti ...
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Praseodymium
Praseodymium is a chemical element with the Symbol (chemistry), symbol Pr and the atomic number 59. It is the third member of the lanthanide series and is considered to be one of the rare-earth metals. It is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. It is too reactive to be found in native form, and pure praseodymium metal slowly develops a green oxide coating when exposed to air. Praseodymium always occurs naturally together with the other rare-earth metals. It is the sixth-most abundant rare-earth element and fourth-most abundant lanthanide, making up 9.1 parts per million of the Earth's crust, an abundance similar to that of boron. In 1841, Swedish chemist Carl Gustav Mosander extracted a rare-earth oxide residue he called didymium from a residue he called "lanthana", in turn separated from cerium salts. In 1885, the Austrian chemist Baron Carl Auer von Welsbach separated didymium into two elements that ...
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