Praseodymium

Lanthanide · 140.90766 u · group 3, period 6

Praseodymium · Pr

Atomic number59

SymbolPr

CategoryLanthanide

Standard stateSolid

Group · Period · Block3 · 6 · f

Electron configuration[Xe]6s2 4f3

Atomic mass140.90766 u

Atomic radius239 pm

Protons / Neutrons / Electrons59 / 82 / 59

Shells (e⁻ per shell)2, 8, 18, 21, 8, 2

Electronegativity (Pauling)1.13

Ionization energy5.464 eV

Electron affinity—

Oxidation states+3

Melting point1.20e+3 K · 930.9 °C

Boiling point3.79e+3 K · 3.52e+3 °C

Density6.77 g/cm³

Year discovered1885

CPK color

#D9FFC7

State at room temp (25 °C)

solid

Position