Astatine
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Astatine and the Halogens!
Astatine is one of the rarest elements in existence.
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Symbol: At
Atomic Number: 85
Atomic Mass: 210 u
Electron Configuration: [Xe] 4f145d106s26p5
Year Discovered: 1940
Discovered By: Dale R. Corson, Kenneth Ross MacKenzie, and Emilio Segrè