Electronic data		Thermal data		Steric 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		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		Atomic radius: 2.67 Å Ionic radius: 1.13 Å () Covalent radius: 1.65 Å Atomic volume: 20.8 cm³/mol Density (293 K): 6.77 g/cm³ Crystal structure: Hexagonal

Legend     Pocket calculator

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

Legend

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 Mich metal.