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Astronomy Chemical element

Lawrencium

Lawrencium (Lr) is a chemical element belonging to the category Inner transition metal (actinide series), with atomic number 103 and atomic mass 262.0000 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

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Astronomy · Chemical element

Lawrencium

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Identity

  • Name: Lawrencium
  • Symbol: Lr
  • Atomic number: 103
  • Atomic mass: 262.0000 u

Position in the periodic table

  • Group: 3
  • Period: 7
  • Category: Inner transition metal (actinide series)

Physico-chemical properties

  • Standard state: Solid (predicted)
  • Melting point: Approximately 1627°C (predicted)
  • Density: Very high (predicted)
  • Electron configuration: [Rn] 5f¹⁴ 7s² 7p¹

Scientific description

Lawrencium is a synthetic chemical element with symbol Lr and atomic number 103. It belongs to the category of Inner transition metal and is usually placed in the actinide series, occupying group 3 and period 7. Its standard atomic mass is 262.0000 u, and its ground-state electron configuration is best described as [Rn] 5f¹⁴ 7s² 7p¹.