• Latin name:
  Lanthanum
• English name:
  Lanthanum
• Year discovered:
  1839
• Discovered by:
  Carl Gustaf Mosander
• Country of Discovery:
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• Cost per 100 grams:
  95 USD
• CAS Number:
  CAS7439-91-0
• Electron shell:
  K2-L8-M18-N18-O9-P2-Q0-R0

Lanthanum is a soft, ductile, silvery-white metallic chemical element with symbol La and atomic number 57. It tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. It gave its name to the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table:it is also sometimes considered the first element of the 6th-period transition metals.

• Atomic number:
  57
• Atomic weight (Relative atomic mass):
  138.90547548286 (g/mol)
• Density:
  6.146 (g/cm³)
• Melting point:
  920.0°C = 1688.00°F = 1193.15K
• Boiling point:
  3464.0°C = 6267.20°F = 3737.15K
• Valence electrons:
  3
• Period:
  6
• Group:
  
• Block:
  d - block
• Emission spectrum:
  

• Phase:
  Solid

  
• Fusion heat:
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• Specific heat:
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• Thermal expansion:
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• Vaporization heat:
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• Electron configuration:
  [Xe] 5d1 6s2 = 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 5d1 6s2
Oxidation states:

• -
• -
• -
• -
• -
• -
• -
• -
• +3
• -
• -
• -
• -
• -
• -
• Ion charge:
  La³⁺
• The ionization potential of an atom:
  5.577 (eV)
• Atomic radius:
  195 (pm)
• Covalent radius:
  194 (pm)
• Van der Waals radius:
  240 (pm)

• Electrical conductivity:
  1626016.2601626 (S/m)
• Electrical type:
  Conductor
• Magnetic type:
  ----
• Volume magnetic susceptibility:
  6.761 ⋅ 10^-5
• Mass magnetic susceptibility:
  1.1 ⋅ 10^-8
• Molar magnetic susceptibility:
  1.528 ⋅ 10^-9 (m³/mol)
• Resistivity:
  6.15 ⋅ 10^-7 (Ω · m)
• Superconducting point:
  -268.27°C = -450.89°F = 4.88K

• Debye temperature:
  -141.15°C = -222.07°F = 132K

• Colour:
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• CAS Number:
  CAS7439-91-0
• CID Number:
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• RTEC Number:
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• Brinell hardness:
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• Mohs hardness:
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• Vickers hardness:
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• Bulk modulus:
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• Young's modulus:
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• Liquid density:
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• Molar volume:
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• Poisson's ratio:
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• Shear modulus:
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• Speed of sound transmission:
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• Refractive index:
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• Thermal conductivity:
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• Electronegativity:
  1.1
• Valence electrons:
  3
• Electron affinity:
  53.795 kJ/mole

• Radioactive:
  No
• Half life:
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• Lifetime:
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• Neutron cross section, barn:
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• Universe contains "Lanthanum" at the rate of
  2 ⋅ 10^-7%
• Sun contains "Lanthanum" at the rate of
  2 ⋅ 10^-5%
• Oceans contain "Lanthanum" at the rate of
  3.4 ⋅ 10^-8%
• Human body contains "Lanthanum" at the rate of
  1.14145627 ⋅ 10^-6%
• The Earth's crust consists of "Lanthanum" at the rate of
  0.0039%
• Meteorites consist of "Lanthanum" at the rate of
  2.8 ⋅ 10^-5%