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.
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.