Praseodymium

created by Webster 1913
(thing) by Destroysun (5.7 y) (print)   (I like it!) Sat Oct 28 2000 at 3:10:16
Uses: Used with neodymium to make lenses for glass maker's goggles since it filters out the yellow light present in glass blowing. Alloyed with magnesium creates a high-strength metal used in aircraft engines. Makes up 5% of Mich metal
(thing) by SSMark82 (2 y) (print)   (I like it!) Tue Dec 12 2000 at 13:40:05
Praseodymium
Symbol: Pr
Atomic Number: 59
Atomic Weight: 140.9077
Boiling Point: 3785 K
Melting Point: 1204 K
Density at 300K: 6.77 g/cm3
Covalent radius: 1.65
Atomic radius: 2.67
Atomic volume: 20.8 cm3/mol
First ionization potental: 5.42 V
Specific heat capacity: 0.193 Jg-1K-1
Thermal conductivity: 12.5 Wm-1K-1
Electrical conductivity: 1.5 106Ω-1m-1
Heat of fusion: 10.04 kJ/mol
Heat of vaporization: 332.63 kJ/mol
Electronegativity: 1.13 (Pauling's)

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(thing) by CentrX (11 mon) (print)   (I like it!) Mon Jan 08 2001 at 21:52:35
(So named (Greek prasios, "leek-green" + didymium) in 1885 by C. A. von Welsbach from its spectroscopic line and from being split from didymium) A silvery, malleable chemical element, one of the rare-earth metals, whose salts are generally green in color and are used to color glasses and enamels.

Symbol: Pr
Atomic number: 59
Atomic weight: 140.90765
Density (at room temperature and pressure): 6.77 g/cc
Melting point: 931°C
Boiling point: 3,520°C
Main valence: +3
Ground state electron configuration: [Xe]4f36s2

(definition) by Webster 1913 (print) Wed Dec 22 1999 at 2:10:30

Pra`se*o*dym"i*um (?), n. [Praseo- + didymium.] Chem.

An elementary substance, one of the constituents of didymium; -- so called from the green color of its salts. Symbol Ps. Atomic weight 143.6.

 

© Webster 1913.

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