Periodic Table of Elements

59

Praseodymium

140.91

Praseodymium was discovered by Carl F. Auer von Welsbach, a German chemist, in 1885.

Name: Praseodymium
Symbol: Pr
Atomic number: 59
Atomic weight: 140.91
State: solid
Group, period, block: n/a, 6, f
Color: grayish white
Classification: lanthanide
Electron configuration: 4r3 6s2
2,8,18,21,8,2

Physical properties

Density: 6.77 g/cm-3
Melting point: 1208 K,935 C,1715 F
Boiling point: 3793 K,3520 C,6368 F

Atomic properties

Oxidation states: 4, 3, 2
Electronegativity: 1.13 (Pauling scale)
Ionization energies: 1st: 527 kJmol-1
Covalent radius: 2037 pm
Van der Waals radius: no data
  • Pr
  • Electron Configuration

Isotopes

There is one naturally occurring stable isotope of praseodymium exists, 141Pr.