Cerium Neodymium

Praseodymium (Pr)

From Wikipedia, the free encyclopediaPraseodymium is a chemical element with symbol Pr and atomic number 59. Praseodymium is a soft, silvery, malleable and ductile metal in the lanthanide group. It is valued for its magnetic, electrical, chemical, and optical properties.

Praseodymium in the periodic table

Symbol

Atomic number

Group

Period

Block

Element category

Lanthanide

Physical properties

Phase at STP

Solid

Density

6.77 g/cm³

Atomic weight

140.908 u

Melting point

1208 K
934.85 °C
1714.73 °F

Boiling point

3403 K
3129.85 °C
5665.73 °F

Atomic properties

Electronegativity (Pauling Scale)

1.13

Electron affinity

93 kJ/mol

Oxidation states

0, +1, +2, +3, +4, +5
(a mildly basic oxide)

Ionization energies

1	527 kJ/mol
2	1020 kJ/mol
3	2086 kJ/mol
4	3761 kJ/mol
5	5551 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)

[Xe] 4f³ 6s²

Electron configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f³ 5s² 5p⁶ 6s²

Electrons per shell

2, 8, 18, 21, 8, 2

History

Discovered

1885

Discovered by

Carl Auer von Welsbach