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Astatine

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Astatine (ˈæstətiːn or /ˈæstətɨn/) is a radioactive chemical element with the symbol At and atomic number 85. It is the heaviest of the discovered halogens. Although astatine is produced by radioactive decay in nature, due to its short half life it is found only in minute amounts. Astatine was first produced by Dale R. Corson, Kenneth Ross MacKenzie, and Emilio Segrè in 1940. Three years passed before traces of astatine were also found in natural minerals. Until recently most of the physical and chemical characteristics of astatine were inferred by comparison to other elements. The alpha-emitting properties of some astatine isotopes are used for science applications, and also medical applications for astatine 211 are tested. Astatine is an element, number 85 on the periodic table. The marshes of an M-Class planet, about 160 million kilometers from Orellius Minor in the Alpha Quadrant, were filled with astatine deposits. (DS9: "Paradise") Astatine (symbol At) is a chemical element, atomic number 85 on the periodic table. Astatine(At) is a radioactive chemical element that boils at 639°F and melts at 576°F. Key Facts: Atomic Number:85 Phase:Solid Standard Atomic Weight:210 Molar Mass

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natural

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unknown

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halogen

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Radioactivity

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Phase

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Dale R. Corson, Kenneth Ross MacKenzie, and Emilio Segre astatine

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Crystal Structure

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Category

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Synthetic or natural

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1940 At

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solid black

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Discovered by Name

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281832187

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Symbol Year of Discovery

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Color

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high

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Electrons Per Shell

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85 Greek for 'unstable'

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Name Atomic Number

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solid

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85

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History General Properties

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Astatine

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*

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At

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Astatine is an element, number 85 on the periodic table. The marshes of an M-Class planet, about 160 million kilometers from Orellius Minor in the Alpha Quadrant, were filled with astatine deposits. (DS9: "Paradise") Astatine(At) is a radioactive chemical element that boils at 639°F and melts at 576°F. Key Facts: Atomic Number:85 Phase:Solid Standard Atomic Weight:210 Molar Mass Astatine (ˈæstətiːn or /ˈæstətɨn/) is a radioactive chemical element with the symbol At and atomic number 85. It is the heaviest of the discovered halogens. Although astatine is produced by radioactive decay in nature, due to its short half life it is found only in minute amounts. Astatine was first produced by Dale R. Corson, Kenneth Ross MacKenzie, and Emilio Segrè in 1940. Three years passed before traces of astatine were also found in natural minerals. Until recently most of the physical and chemical characteristics of astatine were inferred by comparison to other elements. The alpha-emitting properties of some astatine isotopes are used for science applications, and also medical applications for astatine 211 are tested. Astatine (symbol At) is a chemical element, atomic number 85 on the periodic table.