astatine oor Masedonies
astatine
en
A highly radioactive chemical element (symbol At) with atomic number 85 and one of the halogens.
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астат
en
the chemical element
аста́т
en
the chemical element
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Segrè then asked whether he could do the chemistry and, with Kenneth Ross MacKenzie, successfully isolated the new element, which is today called astatine.
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While at Berkeley, Segrè helped discover the element astatine and the isotope plutonium-239, which was later used to make the Fat Man nuclear bomb dropped on Nagasaki.
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(Astatine goes further, being indeed unstable as At− and readily oxidised to At0 or At+, although the existence of At2 is not settled.)
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Francium-221 then decays into astatine-217 by alpha decay (6.457 MeV decay energy).
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Francium is a highly radioactive metal that decays into astatine, radium, and radon.
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(The scarce and fugitive fifth halogen, the radioactive astatine, is not well-studied due to its expense and inaccessibility in large quantities, but appears to show various unusual properties due to relativistic effects.)
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All isotopes of francium decay into astatine, radium, or radon.
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Like the other halogens, it is one electron short of a full octet and is hence a strong oxidising agent, reacting with many elements in order to complete its outer shell, although in keeping with periodic trends, it is the weakest oxidising agent among the stable halogens: it has the lowest electronegativity among them, just 2.66 on the Pauling scale (compare fluorine, chlorine, and bromine at 3.98, 3.16, and 2.96 respectively; astatine continues the trend with an electronegativity of 2.2).
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This trend occurs because the wavelengths of visible light absorbed by the halogens increase down the group (though astatine may not conform to it, depending on how metallic it turns out to be).
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Francium-223 then decays into radium-223 by beta decay (1.149 MeV decay energy), with a minor (0.006%) alpha decay path to astatine-219 (5.4 MeV decay energy).
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astatine At 85
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Astatine's name comes from the Greek word astatos, meaning "unstable".
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12 sinne gevind in 2 ms. Hulle kom uit baie bronne en word nie nagegaan nie.