59
140.91 u
Pr
Praseodymium
Lanthanide
Atomic Structure
Physical State
Group
N/A
Period
6
Block
f
Electron Configuration
[Xe] 4f³ 6s²
Physical Properties
Atomic Mass:
140.91 u
Electronegativity:
1.13
Atomic Radius:
266 pm
Ionization Energy:
5.473 eV
Density:
6.77 g/cm³
Melting Point:
1208 K
Boiling Point:
3793 K
Historical Information
Discovered By:
Carl Auer von Welsbach
Year Discovered:
1885