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praseodymium (Pr)


praseodymium
Praseodymium.
Image copyright: smart-elements.com
A silver-yellow metallic element of the lanthanide series, first isolated in 1885. Its chief ores are monazite and bastnaesite. Soft, malleable, and ductile praseodymium is used in carbon electrodes for arc lamps. Its most common isotope is 141Pr (100%).


atomic number 59
relative atomic mass 140.908
relative density 6.77
melting point 931°C (1,708°F)
boiling point 3,512°C (6,354°F)


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