Praseodymium

Praesodymium is a soft, white metal and a member of the lanthanide group of elements. It closely resembles neodymium and, along with other elements of the same group, is found in the same minerals. It reacts slowly with oxygen but rapidly with water. As a pure metal, its uses are limited; however, it is used as an alloying constituent for alloys used to make permanent magnets and flints.


Symbol
Pr

Uses
Along with neodymium, praseodymium is used to manufacture yellow glass which can be used as eye protection (e.g. for welders).

Discovered
1805 by Baron Auer von Welsbach in Vienna, Austria.

Abundance
9.5 ppm of the earth’s crust.

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Atomic number 59 Clip
Atomic / Molecular Weight 140.9077 gmol-1Clip
Density 6779 kgm-3Clip
Crystal Structure hcp / bcc at 1065K Clip
Lattice constant 367 fmClip
Melting Point 1208 KClip
Boiling Point 3273 KClip
Specific heat capacity 192 Jkg-1K-1Clip
Thermal conductivity 12 Wm-1K-1Clip
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See also: Didymium, Periodic Table.

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Subjects: Chemistry