Astatine (At) in the periodic table — PeriodicTable

Astatine (At) in the periodic tableAstatine is element 85, a halogen of the p block, in group 17, period 6. Its ground-state configuration is [Xe] 4f14 5d10 6s2 6p5, and it usually shows the oxidation states -1, 0, 1.It was discovered in 1940, by Corson,MacKenzie and Segrè.Name origin: the Greek astatos, 'unstable'. Blank rows are columns the sheet does not measure for this element.

Property

Value

Unit

Atomic weight

210

Da

Electronegativity

2.2

First ionisation energy

899.003

kJ/mol

Van der Waals radius

202

pm

Melting point

575

K

Boiling point

610

K

Density

7

g/cm³

Abundance

0

mg/kg

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