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Astronomy Chemical element

Erbium

Erbium (Er) is a chemical element belonging to the category Inner transition metal, with atomic number 68 and atomic mass 167.2600 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

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Astronomy · Chemical element

Erbium

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Identity

  • Name: Erbium
  • Symbol: Er
  • Atomic number: 68
  • Atomic mass: 167.2600 u

Position in the periodic table

  • Group: 3
  • Period: 6
  • Category: Inner transition metal

Physico-chemical properties

  • Standard state: Solid
  • Melting point: Approx. 1529°C
  • Density: Approx. 9.07 g/cm³
  • Electron configuration: [Xe] 4f¹² 6s²

Scientific description

Erbium is a chemical element with symbol Er and atomic number 68. It belongs to the category of Inner transition metal and occupies group 3 and period 6. Its standard atomic mass is 167.2600 u.