Definitions for astatine
ˈæs təˌtin -tɪnas·ta·tine

Princeton's WordNetRate this definition:0.0 / 0 votes

1. astatine, At, atomic number 85noun

   a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium

WiktionaryRate this definition:0.0 / 0 votes

1. astatinenoun

   A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85.

2. Etymology: From ἄστατος.

WikipediaRate this definition:0.0 / 0 votes

1. Astatine

   Astatine is a chemical element with the symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements. All of astatine's isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours. A sample of the pure element has never been assembled, because any macroscopic specimen would be immediately vaporized by the heat of its own radioactivity. The bulk properties of astatine are not known with certainty. Many of them have been estimated from the element's position on the periodic table as a heavier analog of iodine, and a member of the halogens (the group of elements including fluorine, chlorine, bromine, and iodine). However, astatine also falls roughly along the dividing line between metals and nonmetals, and some metallic behavior has also been observed and predicted for it. Astatine is likely to have a dark or lustrous appearance and may be a semiconductor or possibly a metal. Chemically, several anionic species of astatine are known and most of its compounds resemble those of iodine, but it also sometimes displays metallic characteristics and shows some similarities to silver. The first synthesis of the element was in 1940 by Dale R. Corson, Kenneth Ross MacKenzie, and Emilio G. Segrè at the University of California, Berkeley, who named it from the Ancient Greek ἄστατος (astatos) 'unstable'. Four isotopes of astatine were subsequently found to be naturally occurring, although much less than one gram is present at any given time in the Earth's crust. Neither the most stable isotope astatine-210, nor the medically useful astatine-211, occur naturally; they can only be produced synthetically, usually by bombarding bismuth-209 with alpha particles.

ChatGPTRate this definition:0.0 / 0 votes

1. astatine

   Astatine is a radioactive chemical element with the symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, with most of it produced by decay of other heavier elements. Astatine is a member of the halogen group of elements and behaves similar to iodine. It has three allotropic forms and over 30 isotopes, but due to its high radioactivity, little is known about its chemical and physical properties.

WikidataRate this definition:0.0 / 0 votes

1. Astatine

   Astatine is a radioactive chemical element with the chemical symbol At and atomic number 85. It occurs on Earth only as the result of the radioactive decay of certain heavier elements. All of its isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours. Accordingly, much less is known about astatine than most other elements. The observed properties are consistent with it being a heavier analog of iodine; many other properties have been estimated based on this resemblance. Elemental astatine has never been viewed, because a mass large enough to be seen would be immediately vaporized by the heat generated by its own radioactivity. Astatine may be dark, or it may have a metallic appearance and be a semiconductor, or it may even be a metal. It is likely to have a much higher melting point than does iodine, on par with those of bismuth and polonium. Chemically, astatine behaves more or less as a halogen, being expected to form ionic astatides with alkali or alkaline earth metals; it is known to form covalent compounds with nonmetals, including other halogens. It does, however, also have a notable cationic chemistry that distinguishes it from the lighter halogens. The second longest-lived isotope of astatine, astatine-211, is the only one currently having any commercial application, being employed in medicine to diagnose and treat some diseases via its emission of alpha particles. Only extremely small quantities are used, however, due to its intense radioactivity.

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Astatine

   Astatine. A radioactive halogen with the atomic symbol At, atomic number 85, and atomic weight 210. Its isotopes range in mass number from 200 to 219 and all have an extremely short half-life. Astatine may be of use in the treatment of hyperthyroidism.

Matched Categories

1. • Element
   • Halogen

Usage in printed sourcesFrom: 

1. [["1714","1"],["1791","1"],["1843","1"],["1853","1"],["1888","1"],["1889","1"],["1894","1"],["1899","1"],["1901","2"],["1909","1"],["1927","1"],["1930","1"],["1940","1"],["1942","4"],["1946","229"],["1947","29"],["1948","48"],["1949","113"],["1950","196"],["1951","141"],["1952","49"],["1953","62"],["1954","106"],["1955","142"],["1956","118"],["1957","151"],["1958","175"],["1959","666"],["1960","764"],["1961","275"],["1962","61"],["1963","133"],["1964","318"],["1965","171"],["1966","125"],["1967","242"],["1968","147"],["1969","114"],["1970","43"],["1971","121"],["1972","191"],["1973","52"],["1974","229"],["1975","89"],["1976","78"],["1977","78"],["1978","79"],["1979","63"],["1980","125"],["1981","91"],["1982","151"],["1983","84"],["1984","113"],["1985","111"],["1986","113"],["1987","146"],["1988","128"],["1989","160"],["1990","98"],["1991","78"],["1992","1421"],["1993","171"],["1994","225"],["1995","176"],["1996","199"],["1997","169"],["1998","213"],["1999","243"],["2000","283"],["2001","259"],["2002","241"],["2003","285"],["2004","330"],["2005","141"],["2006","207"],["2007","317"],["2008","125"]]

Anagrams for astatine »

1. Tánaiste

2. in a state

3. sanitate

How to pronounce astatine?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say astatine in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of astatine in Chaldean Numerology is: 6

2. Pythagorean Numerology

   The numerical value of astatine in Pythagorean Numerology is: 8

Popularity rank by frequency of use

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=astatine
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Astatine
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Astatine
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=astatine
6. ^ Usage in printed sources
   https://books.google.com/ngrams/graph?content=astatine