Information

Lanthanum (La) - Properties


Atomic mass, symbol and atomic number

lanthanum is a natural element with the elemental symbol La and atomic number 57. In the periodic table, it belongs to the Lanthanoids with an atomic mass of 138.90 u. The chemical element discovered by Carl Gustav Mosander in 1945 is not radioactive and is in a solid state of aggregation at room temperature.

Wanted poster: Lanthanum (English: Lanthanum)

General
Chemical element:lanthanum
Symbol:La
Atomic number:57
Group:scandium
Period:6
Block:d-block
Series:Transition metals
Appearance:Gray
explorers:Carl Gustav Mosander
Year of discovery:1839
Atomic properties
Atomic mass:138,905 u
Atomic radius:195 pm
Covalent radius:207 pm
Van der Waals radius:???
Electron configuration:Xe 5d1 6s2
ionization:538.1 kJ / mol
Physical Properties
Physical state:firmly
Density:???
Crystal structure:hexagonal
Magnetism:paramagnetic
molar volume:22,39 · 10-6 m3/ mol
Mohs hardness:2,5
Melting point:920 ° C
Boiling point:3470 ° C
Heat of fusion:6.2 kJ / mol
Heat of vaporization:400 kJ / mol
Thermal conductivity:13 W
Chemical properties
electronegativity:1,1

Did you know that ...

  • the group of lanthanoids have the name Lanthan?
  • the name lanthanum can be derived from the Greek and means "hidden" means?
  • Lanthanum oxides used in the manufacture of camera lenses?