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Astronomy Chemical element

Astatine

Astatine (At) is a chemical element belonging to the Halogen category, with atomic number 85 and atomic mass 210.0000 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

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Astronomy · Chemical element

Astatine

EL2D

Identity

  • Name: Astatine
  • Symbol: At
  • Atomic number: 85
  • Atomic mass: 210.0000 u

Position in the periodic table

  • Group: 17
  • Period: 6
  • Category: Halogen

Physico-chemical properties

  • Standard state: Solid
  • Melting point: Approx. 300°C
  • Density: Unknown (estimated high)
  • Electron configuration: [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵

Scientific description

Astatine is a chemical element with symbol At and atomic number 85. It belongs to the category of Halogen and occupies group 17 and period 6. Its standard atomic mass is 210.0000 u.