Periodic Table of Elements

Element Lanthanum - La

Comprehensive data on the chemical element Lanthanum is provided on this page; including scores of properties, element names in many languages, most known nuclides of Lanthanum. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.

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Overview of Lanthanum

Lanthanum's Name in Other Languages

  • Latin: Lanthanium
  • Czech: Lanthan
  • Croatian: Lantan
  • French: Lanthane
  • German: Lanthan - r
  • Italian: Lantanio
  • Norwegian: Lantan
  • Portuguese: Lantânio
  • Russian: Лантан
  • Spanish: Lantano
  • Swedish: Lantan

Atomic Structure of Lanthanum

Chemical Properties of Lanthanum

Physical Properties of Lanthanum

  • Atomic Mass Average: 138.9055
  • Boiling Point: 3730K 3457°C 6255°F
  • Coefficient of lineal thermal expansion/K-1: 4.9E-6
  • Conductivity
    Electrical: 0.0126 106/cm Ω
    Thermal: 0.135 W/cmK
  • Density: 6.15g/cc @ 300K
  • Description:
    Soft silvery white transition metal that rapidly tarnishes in air. It will burn easily if ignited.
  • Elastic Modulus:
    • Bulk: 28/GPa
    • Rigidity: 14.9/GPa
    • Youngs: 37.9/GPa
  • Enthalpy of Atomization: 431 kJ/mole @ 25°C
  • Enthalpy of Fusion: 6.2 kJ/mole
  • Enthalpy of Vaporization: 399.6 kJ/mole
  • Flammablity Class:
  • Freezing Point: see melting point
  • Hardness Scale
    • Brinell: 363 MN m-2
    • Mohs: 2.5
    • Vickers: 491 MN m-2
  • Heat of Vaporization: 414kJ/mol
  • Melting Point: 1193K 920°C 1688°F
  • Molar Volume: 22.6 cm3/mole
  • Physical State (at 20°C & 1atm): Solid
  • Specific Heat: 0.19J/gK
  • Vapor Pressure = 1.33E-07Pa@920°C

Regulatory / Health

  • CAS Number
    • 7439-91-0
  • OSHA Permissible Exposure Limit (PEL)
    • No limits set by OSHA
  • OSHA PEL Vacated 1989
    • No limits set by OSHA
  • NIOSH Recommended Exposure Limit (REL)
    • No limits set by NIOSH
  • Levels In Humans:
    Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
    • Blood/mg dm-3: n/a
    • Bone/p.p.m: <0.08
    • Liver/p.p.m: 0.3
    • Muscle/p.p.m: 0.0004
    • Daily Dietary Intake: n/a
    • Total Mass In Avg. 70kg human: 0.8 mg
  • Discovery Year: 1839
  • Name Origin:
    Greek: lanthanein (to lie hidden).
  • Abundance of Lanthanum:
    • Earth's Crust/p.p.m.: 32
    • Seawater/p.p.m.:
      • Atlantic Suface: 0.0000018
      • Atlantic Deep: 0.0000038
      • Pacific Surface: 0.0000026
      • Pacific Deep: 0.0000069
    • Atmosphere/p.p.m.: N/A
    • Sun (Relative to H=1E12): 13.5
  • Sources of Lanthanum:
    Found with rare earths in monazite and bastnasite. Around 12,500 tons are produced world wide each year. Primary mining areas are USA, Brazil, India, Sri Lanka, Australia.
  • Uses of Lanthanum:
    Because it gives glass refractive properties, it is used in expensive camera lenses. Also used in lighter flints, battery electrodes and catalytic converters.
  • Additional Notes:

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