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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

Last Updated: 6/27/22