Astatine

By Olivia Gbur

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Fun Facts

Astatine comes from Astatos. Astatos is the Greek word for unstable. It's an unstable element because it is radioactive.


Astatines symbol is At. The element is number 85 on the periodic table.


It's the rarest element on the earth.


More than 30 isotopes of astatine have been identified. It can be produced both synthetically and naturally. Through bombarding bismuth with alpha particles is the synthetical way. The natural way to obtain astatine is through the decay of uranium or thorium.

Physical Properties

Astatine atomic mass is 210u. Its atomic radius in picometers (pm) is 127pm. Density of Astatine is about 7 grams per cubic centimeter. The melting point is 302.0 C while its boiling point is 337.0 C. At room temperature (22°C), this element is a solid. Astatines appearance is thought to have a dark color but it is unknown. It is presumed dark but unknown. The elements thermal conductivity is 2 W/(m K). Due to this element being very rare the malleability and the hardness is n/a.


Other physical properties include a half life span of 8.1 hours. Also just the other fact that this element is radioactive.

Astatine

Chemical Properties

Astatines chemical properties include its flammability and reactivity. Although the flammability is unknown the reactivity with hydrogen makes the element dissolve making this mixture form hydrostatic acid.

History

Astatine was produced for the first time in 1940 by Dale R. Corson, K.R. Mackenzie, and Emilio Segre at the University of California. The element was discovered at the University of California, Berkeley. The three people who produced Astatine had bombarded bismuth with alpha particles, although naturally it can be produced by thorium or uranium decay.


It was also discovered in nature. It was found by Berta Karlik and Traude Bernert about three years after it had been produced.

Applications and Uses

No uses have been found for Astatine due to its half life span of 8.1 hours and it is extremely rare. Although it is very similar to iodine. It is thought to have similar uses, but it would be wiser to use the one that has a better life span which would be iodine. The element produces the isotope positron emission but it's too rare to have a use. Though the element has more than 30 isotopes that have been identified. Astatine compounds include Sodium astatide, Magnesium astatide and Carbon tetraastatide.
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Atomic Structure

Astatine atomic structure includes the atomic number, mass number, protons, neutrons and electrons. The atomic number is 85. The mass number is 210. The proton number is 85. The neutron number is 125. The electron number is 85.

Sources Used

  • Element Card: Gray, Theodore W. (2008). The Photographic Card Deck of the Elements.

  • Elements Book: Gray, Theodore W. (2009). The Elements: A visual exploration of every known atom in the universe. New York: Black Dog & Leventhal Publishers, Inc.

  • Elements Website: "Astatine." Periodic Table. Web. 23 Dec. 2015. <http://www.rsc.org>.

  • Elements Website: "Astatine." Ivy Rose Holistic. Web. 23 Dec. 2015. <http://www.ivyroses.com/>.