from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
In collaboration with Traude Cless-Bernert, she discovered the natural occurrence of isotopes of astatine by observation of their radioactive alpha particle decays.
The other halogens are: fluorine, an extremely reactive gas; chlorine, a reactive, heavy gas; iodine, a relatively inactive solid; and astatine.
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O2 (g) • all halogens: fluorine - F2 (g) chlorine - Cl2 (g) bromine - Br2 (l) iodine - I2 (s) astatine - At2 (s) polyatomic elements include: • • phosphorous - P4 (s) • sulfur - S8 (s) all other nonmetals are monatomic and solid, • except bromine Chemistry 20 - Unit 3 Page 2