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Astatine
SEE PERIODIC TABLE
SEE FULL ARTICLE
Atomic Number
85
Atomic
Symbol
At
Atomic Weight
[210 amu]
Group
Halogen, 17
Form
Solid
Melting Point
302 °C (575.6 °F, 575.15 °K)
Heat of Fusion
6 kJ/mol (approx.)
Heat of Vaporization
40 kJ/mol (approx.)
Electronegativity
(on
Pauling scale
2.2
Ground State
Electron Configuration
5d
10
6s
2
6p
5
Oxidation State(s)
+1, +3, +5, +7, -1
Selected
Radioisotopes
210
At,
211
At
Atomic Radius
127 pm
Discovered by
Corson; MacKenzie; Segre, 1940
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