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Astronomy Chemical element

Lanthanum

Lanthanum (La) is a lanthanide element belonging to the rare-earth metals, with atomic number 57 and atomic mass 138.90547 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

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Astronomy · Chemical element

Lanthanum

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Identity

  • Name: Lanthanum
  • Symbol: La
  • Atomic number: 57
  • Atomic mass: 138.90547 u

Position in the periodic table

  • Series: Lanthanide
  • Period: 6
  • Category: Rare-earth metal

Physico-chemical properties

  • Standard state: Solid
  • Melting point: ~920 °C
  • Density: ~6.15 g/cm³
  • Electron configuration: [Xe] 5d¹ 6s²

Scientific description

Lanthanum is a chemical element with symbol La and atomic number 57. It belongs to the lanthanide series, part of the rare-earth metals, and is located in period 6. Its standard atomic mass is 138.90547 u.