Praseodymium

Element 59 on the periodic table, symbol Pr, group 3, period 6.

Praseodymium 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.

Appearance: grayish white

Properties

Atomic Number: 59
Atomic Mass: 140.9077 u
Group: 3
Period: 6
Block: f-block
Category: Lanthanide
State at 25 °C: Solid
Melting Point: 1,208 K · 934.9 °C
Boiling Point: 3,403 K · 3,129.9 °C
Density: 6.77 g/cm³
Atomic Radius: 185 pm
Electronegativity: 1.13
Oxidation States: +3
Abundance in Crust: 9.2 mg/kg
Discovered: 1885
Discovered By: Carl Auer von Welsbach

Electron Configuration

[Xe] 4f3 6s2

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

Ionisation Energies (kJ/mol)

1. 527
2. 1,020
3. 2,086
4. 3,761
5. 5,551

Elements near Praseodymium

Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.