| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| astatine |
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| SYLLABICATION: | as·ta·tine |
| PRONUNCIATION: |   s t -t n , -t n |
| NOUN: | Symbol At A highly unstable radioactive element, the heaviest of the halogen series, that resembles iodine in solution. Its longest lived isotope has a mass number of 210 and has a half-life of 8.3 hours. Atomic number 85; melting point 302°C; boiling point 337°C; valence probably 1, 3, 5, 7. See table at element. | | ETYMOLOGY: | Greek astatos, unstable; see astasia + –ine2.
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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