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Astatine ✕
Symbol At
Atomic number 85
Chemical property Metalloid
Origin o the name the Greek astatos, 'unstable'
Group 17
Period 6
Density (g/cm³) 7
Melting point (K) 575
Boiling point (K) 610
Electro-negativity 2.2
Abundance in earth's crust (mg/kg) 0