-- card: 36447 from stack: in
-- bmap block id: 0
-- flags: 0000
-- background id: 14320
-- name: At


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At

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Astatine

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85

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(210)

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302

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337

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+1,+3,+5,+7

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(Gr. astatos, unstable) Synthesized in 1940 by Corson, MacKenzie and Segre at the University of California by bombarding bismuth with alpha particles. At-210 has the longest half-life of 8.3 hours. 

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radioactive, 20 isotopes known, halogen, similar to iodine, possible accumulates in the thyroid like iodine

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Electron Configuration:

1s  2s  2p  3s  3p  3d  4s  4p  4d  4f  5s  5p  5d  5f  6s  6p  6d  6f  7s 
 2   2    6    2    6   10   2   6  10  14  2    6  10         2    5