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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

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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(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

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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