NO. 059Lanthanide

Pr

Praseodymium

Praseodymium is a soft lanthanide used in magnets, lasers, and aircraft engine alloys.

Crystal Structure

Double hexagonal close-packed (dhcp)

Atomic Mass140.91 u

Density6.77 g/cm³

Melting Point1208 K

Boiling Point3793 K

Atomic Radius182 pm

Electronegativity1.13

Ionization Energy527 kJ/mol

Electron Affinity50 kJ/mol

Bonding TypeMetallic

Oxidation States3

Acid/BaseBasic

ReactivityHigh

Electron Configuration

[Xe] 4f3 6s2

Discovered ByCarl Auer von Welsbach

Year1885

Known Isotopes

Pr-141