Atomic Number: 85

Name: Astatine

Atomic symbol: At

Atomic Weight: 209.9871

Electron affinity: -270 kJ/mol

Electron configuration: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹⁴5d¹⁰6s²6p⁵

Ionization energies:

Pauling electronegativity: 2.2

Melting Point: 302^oC

Boiling Point: 337^oC

Standard potential (volts), X₂ + 2e^- ---> X^2-: 0.3

Covalent radius: 1.48 angstroms

Ionic radius: 0.62 angstroms (+7)

Common oxidation states in compounds: -1, +5, +7