Atomic Element Z = 59 • Lanthanide
Praseodymium (Pr) — Atomic Data, Electron Shells & Reactions
Praseodymium (symbol Pr, atomic number 59) has a standard atomic weight of 140.91 u and ground-state configuration [Xe] 4f3 6s2.
Atomic Number (Z)
59
IUPAC Symbol
Pr
Standard Atomic Weight
140.91 g/mol
Period / Group / Block
6 / f-block / f-block
Condensed Electron Config
[Xe] 4f3 6s2
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f3 5s2 5p6 6s2
Principal Shell Occupancy
[2, 8, 18, 21, 8, 2]
Pauling Electronegativity
1.13
First Ionization Energy
527 kJ/mol
Covalent Radius
203 pm
Melting Point
1208 K (934.85 °C)
Boiling Point
3793 K (3519.85 °C)
Density
6.773 g/cm³
Oxidation States
+3
Pr (Z=59) — Valence shell highlighted in vermilion