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astatine

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astatine
astatine Chem. (ˈæstətɪn, -iːn) [f. Gr. ἄστατ-ος unstable (see astasia) + -ine5.] A radioactive element of short half-life, which is rare in nature but can be made artificially; the heaviest element of the halogen group. (Formerly called alabamine and anglo-helvetium.) Symbol At, atomic number 85, p... Oxford English Dictionary
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Astatine
A beta decay mode has been found for all other astatine isotopes except for astatine-213, astatine-214, and astatine-216m. Astatine-218 was the first astatine isotope discovered in nature. wikipedia.org
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Facts About Astatine | Live Science
Atomic symbol (on the periodic table of elements): At. Atomic weight (average mass of the atom): 210. Density: approximately 4 ounces per cubic inch (approximately 7 grams per cubic cm) Phase at ...
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astatine
astatine/ˈæstəti:n; `æstəˌtin/ n[U](chemistry 化) artificial radioactive element （人工放射性元素）. =>App 10 见附录10. 牛津英汉双解词典
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Astatine bromide
Production Astatine bromide is produced by the reaction of astatine with an aqueous solution of iodine monobromide: At2 + 2 IBr → 2 AtBr + I2 Astatine Astatine compounds Bromides wikipedia.org
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Astatine iodide
Astatine iodide is an interhalogen compound with the chemical formula AtI. Production Astatine iodide is produced by the direct combination of astatine and iodine in a 1:1 molar ratio: At2 + I2 → 2 AtI References Bibliography wikipedia.org
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alabamine
alabamine (Disused.) (æləˈbæmɪn) [f. Alabama, name of a State in U.S.A. + -ine5.] The name originally proposed for astatine. Cf. also anglo-helvetium.1932 F. Allison et al. in Jrnl. Amer. Chem. Soc. LIV. 616 We suggest the name Alabamine and symbol Am for element 85. 1936 Nature 13 June 969/2 The pr... Oxford English Dictionary
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Astatine compounds
Astatine compounds are compounds that contain the element astatine (At). As this element is very radioactive, few compounds have been studied. Notes References Works cited Astatine compounds Astatine Chemical compounds by element wikipedia.org
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helvetium
helvetium Chem. (hɛlˈviːʃɪəm) [ad. G. helvetium (W. Minder 1940, in Helvetica Physica Acta XIII. 152), f. mod.L. Helvet(ia Switzerland + -ium.] Earlier name for astatine. Cf. also alabamine and anglo-helvetium. (Disused.)1940 Times 13 Aug. 3/2 The Swiss scientist, Dr. W. Minder, of Berne University,... Oxford English Dictionary
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anglo-helvetium
ˌanglo-helˈvetium Earlier name for astatine. Cf. also alabamine. (Disused.)1942 Nature CL. 768 As a tribute to the scientific work of our two countries, we propose to name the element 85 ‘anglo-helvetium’. Oxford English Dictionary
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Organoastatine chemistry
back to free astatine. References Further reading Astatine wikipedia.org
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Sodium astatide
Sodium astatide is a binary inorganic compound of sodium and astatine with the chemical formula . References Astatine compounds Sodium compounds wikipedia.org
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集齐元素周期表所有元素，大概需要多少钱？
元素“砹”，At（Astatine）是公认为地球自然界存在的最稀有的元素，目前估计地球总存量大概在25克左右。 而我，应该是地球上少数（不超过100）可以接触到At元素的人之一。 先从砹元素的历史讲起。 1947年，发现这一元素的几位科学家将这个元素命名为砹Astatine，命名是根据希腊语Astatos，意义为“不稳定”，因为砹元素并没有任何稳定的同位素。同时，砹元素相对最稳定的同位素，半衰期只有8个小时。如果有人将大量的砹元素放在一起，砹元素立刻就会因为自身的放射性释放的热量而蒸发消失。 zhihu
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Hydrogen astatide
of astatine. Finally, radiolysis from astatine nuclei could sever the H–At bonds. Additionally, astatine has no stable isotopes. wikipedia.org
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Walter Minder
He together with Alice Leigh-Smith announced the discovery of element 85 (now called astatine) in 1940 and 1942. wikipedia.org
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