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Astatine

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name Astatine
latin Astatium
french Astate
german Astat
symbol At
proton number 85
atomic weight [210]
Pauling electronegativity 2.2
electronic configuration [Xe] 4f145d106s26p5
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melting point 575 K, 302°C, 575°F
boiling point -
group 17
period 6
state (by 20°C) solid
oxidation states -1, +1, +3, +5, +7
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Discoverer

Year of discovery Discoverers
1940 Dale R. Corson
K. R. Meckenzie
Emilio G. Segre (1905-1989)

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