Element Astatine (At)

Atomic number 85 · halogen · Atomic mass 210 u

Atomic Mass
210.0000 u
Element Properties
Atomic Number 85
Atomic Mass 210.0000 u
Category halogen / 卤素
Group 17
Period 6
Block P
Electron Configuration [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵
Electronegativity (Pauling) 2.2
Phase at STP Solid
Density 8.91 g/cm³
Year Discovered 1940

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