Astatine
Symbol
At
Atomic Number
85
Atomic Weight
209.9871
Element Classification
Discovered By
D.R.Corson, K.R.MacKenzie, E. Segre
Discovery Date
1940 (United States)
Name Origin
Greek: astatos (unstable).
Density (g/cc)
n/a
Melting Point (K)
575
Boiling Point (K)
610
Appearance
Unstable, radioactive halogen
Atomic Radius (pm)
n/a
Atomic Volume (cc/mol)
n/a
Covalent Radius (pm)
(145)
Ionic Radius
62 (+7e)
Specific Heat
n/a
Fusion Heat (kJ/mol)
n/a
Evaporation Heat (kJ/mol)
n/a
Thermal Conductivity (@25°C W/m K)
n/a
Debye Temperature (K)
n/a
Pauling Negativity Number
2.2
First Ionizing Energy (kJ/mol)
916.3
Oxidation States
7, 5, 3, 1, -1
Electronic Configuration
[Xe] 4f14 5d10 6s2 6p5
Lattice Structure
(n/a)
Lattice Constant
n/a
Lattice C/A Ratio
n/a
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