Symbol La
Atomic Number 57
Atomic Mass 198.905 g.mol -1
Discovered by Carl Gustav Mosander in 1839

Chemical Properties of Lanthanum

Group Lanthanides Melting point 920°C, 1688°F, 1193 K
Period 6 Boiling point 3464°C, 6267°F, 3737 K
Block d Density (g cm−3) 6.15
Atomic number 57 Relative atomic mass 138.905
State at 20°C Solid Key isotopes 139La
Electron configuration [Xe]5d6s2 CAS number 7439-91-0
ChemSpider ID 22369 ChemSpider is a free chemical structure database.

What is Lanthanum?

  • Lanthanum is a chemical element with an atomic number of 57 and represented by the symbol La in the Periodic Table.

Uses of Lanthanum

  • The chemical Lanthanum is found in modern television sets, the energy saving lamps, fluorescent tubes, etc.
  • It is used in the field of optics as lenses and radiation absorbing glasses.
  • It is known to increase the resistivity and malleability of steel.
  • It is also used for catalysis in the field of petroleum refineries.
  • It is used in the production of catalyst and also in polishing of glass.

Properties of Lanthanum

  • It is found abundantly in the environment.
  • It appears like a white- silvery metal.
  • This metal is soft in nature and also active and ductile.
  • On reaction with water, this metal oxidizes forming its hydroxide.
  • The salts of Lanthanum are insoluble in water.
  • About 12.000 tonnes of lanthanum is produced worldwide every year.

Certain Health Facts About Lanthanum

  • The main problem with this element is its disposal. By the industrial wastes getting dumped into the water bodies mainly the petroleum producing industry.
  • It produces severe damage to plants and animals and also causes nervous system disorder in humans.

Practise This Question

Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statements is not true.