Praseodymium

Chaitra 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08

Property	Value
Atomic Number	59
Element	Praseodymium
Symbol	Pr
Atomic Mass	140.908 u
Number of Neutrons	82 (most common isotope, Praseodymium-141)
Number of Protons	59
Number of Electrons	59
Period	6
Group	Lanthanide (no fixed group number)
Phase	Solid
Radioactive	No
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Lanthanide
Atomic Radius	239 pm
Electronegativity	1.13 (Pauling scale)
First Ionization Energy	5.473 eV
Density	6.77 g/cm³
Melting Point	931 °C
Boiling Point	3520 °C
Number of Isotopes	1 stable (Praseodymium-141)
Discoverer	Carl Auer von Welsbach
Year	1885
Specific Heat	0.193 J/g·K
Number of Shells	6
Number of Valence Electrons	3