In detail

Praseodymium (Pr) properties

Atomic mass, symbol and atomic number

praseodymium is a natural element with the element symbol Pr and the ordinal number 59. In the periodic table it belongs to the lanthanides with an atomic mass of 140,907 u. The chemical element discovered by Carl Auer von Welsbach in 1885 is not radioactive and is in a solid state of aggregation at room temperature.

Profile: Praseodymium (praseodymium)

Chemical element:praseodymium
Atomic number:59
Appearance:grey yellow
explorers:Carl Auer von Welsbach
Year of discovery:1885
Atomic properties
Atomic mass:140,907 u
Atomic radius:185 pm
Covalent radius:203 pm
Van der Waals radius:???
Electron configuration:Xe 4f3 6s2
ionization:527 kJ / mol
Physical Properties
Physical state:firmly
Crystal structure:hexagonal
molar volume:20,80 · 10-6 m3/ mol
Mohs hardness:???
Melting point:935 ° C
Boiling point:3130 ° C
Heat of fusion:6.9 kJ / mol
Heat of vaporization:331 kJ / mol
Thermal conductivity:13 W
Chemical properties

Did you know that ...

  • Praseodymium oxidized in the air and as a result receives a green color?
  • the chemist Carl Auer von Welsbach won praseodymium and didymium neodymium, which until then had been mistaken for a chemical element?
  • Praseodymium is one of 22 pure elements, therefore, has only one naturally occurring isotope?