Praseodymium

Metal

Symbol: Pr
Atomic number: 59
Atomic mass: 140.90765
Group: Lanthanide
CAS-number: 7440-10-0

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Electronic data

Shells: 2, 8, 18, 21, 8, 2
Orbitals: [Xe] 4f³ 6s²
Electronegativity: --, 1.1
1. Ionization potential: 5.464 eV
2. Ionization potential: 10.551 eV
3. Ionization potential: 21.62 eV
Oxidation states: 4, 3
Electrical conductivity: 0.0148 10^6

Thermal data

Melting point: 931 °C
Boiling point: 3520 °C
Specific heat: 0.19 J/gK
Heat of fusion: 6.890 kJ/mol
Heat of vaporization: 296.80 kJ/mol
Thermal conductivity: 0.125 W/cmK

Steric data

Atomic radius: 2.67 Å
Ionic radius: 1.13 Å (+3)
Covalent radius: 1.65 Å
Atomic volume: 20.8 cm³/mol
Density (293 K): 6.77 g/cm³
Crystal structure: hexagonal

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
¹⁴¹Pr	100	140.908	5/2	--	--
¹⁴²Pr	0	142	2	19.12h	β-, EC	View
¹⁴³Pr	0	143	7/2	13.57d	β-	View
¹⁴⁴Pr	0	144	0	17.28m	β-	View
¹⁴⁴Prm	0	144	3	7.2m	IT, β-	View

Name origin:	Greek: prasios and didymos (green twin); from its green salts.
Description:	Silvery white, moderately soft, malleable, ductile metal.
Discovered by:	C.F. Aver von Welsbach
Year:	1885
Place:	Austria
Sources:	Obtained from same salts as neodymium.
Use(s):	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 Mischmetal.

Praseodymium

Physical data

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Steric data

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