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Properties of substance:

astatine

Group of substances:

inorganic

Empirical formula (Hill's system for organic substances):

At2

Structural formula as text:

At2

Molar/atomic mass: 419.97

Melting point (°C):

302

Boiling point (°C):

337

Solubility (g/100 g of solvent):

benzene: soluble [Ref.]
carbon tetrachloride: soluble [Ref.]
diisopropyl ether: soluble [Ref.]

Numerical data:

Year of discovery: 1940
Ionization Potentials (Electronvolts): 9.5

Half-life:

19385At = 40 ms (α)
19485At = 40 ms (α)
19585At = 328 ms (α)
19685At = 253 ms ()
19785At = 350 ms (α (96%), β+ (4%))
19885At = 4.2 s ()
19985At = 7.2 s (α (89%))
20085At = 43.2 s (α (57%), β+ (43%))
20185At = 85 s (α (71%), β+ (29%))
20285At = 184 s ()
20385At = 7.4 min (α (31%), β+ (69%))
20485At = 9.2 min (β+ (96.2%), α (3.8%))
20585At = 26.2 min (β+ (90%), α (10%))
20685At = 30.6 min (β+ (99.11%), α (0.89%))
20785At = 1.8 h (β+ (91.4%), α (8.6%))
20885At = 1.63 h (β+ (99.45%), α (0.55%))
20985At = 5.41 h (β+ (95.9%), α (4.1%))
21085At = 8.1 h (β+ (99.825%), α (0.175%))
21185At = 7.214 h (electron capture (58.2%), α (41.8%))
21285At = 314 ms (α (about 100%))
21385At = 125 ns (α (100%))
21485At = 558 ns (α (100%))
21585At = 100 μs (α (100%))
21685At = 300 μs (α (about 100%))
21785At = 32.3 ms (α (99.992%), β- (0.008%))
21885At = 1.5 s (α (99.9%), β- (0.1%))
21985At = 56 s (α (97%), β- (3%))
22085At = 3.71 min (β- (92%), α (8%))
22185At = 2.3 min (β- (100%))
22285At = 54 s (β- (100%))
22385At = 50 s (β- (99.992%), α (0.008%))

Vapour pressure (Torr):

361 (302°C)

Electrode potential:

At2 + 2e- → 2At-, E = 0.2 V (water, 25°C)

References:

  1. Advances in Inorganic Chemistry and Radiochemistry. - 1964. - Vol. 6. - pp. 207-223
  2. Bell C.F. Syntheses and Physical Studies of Inorganic Compounds. - Pergamon Press, 1972. - pp. 229-235
  3. Dean J.A. Lange's handbook of chemistry. - 1999. - pp. 3.18
  4. Patnaik P. Handbook of inorganic chemicals. - McGraw-Hill, 2003. - pp. 75-77
  5. Бекман И.Н. Радиохимия. Том II: Радиоактивные элементы. - М.: Издатель Мархитин П.Ю., 2014. - pp. 81-84 [Russian]
  6. Вредные химические вещества: Радиоактивные вещества. Справочник. - Л., 1990. - pp. 343-344 [Russian]
  7. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 227-229 [Russian]
  8. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 50 [Russian]
  9. Коттон Ф., Уилкинсон Дж. Современная неорганическая химия. - Ч.2. - М.: Мир, 1969. - pp. 423-424 [Russian]
  10. Лаврухина А.К., Поздняков А.А. Аналитическая химия технеция, прометия, астатина и франция. - М.: Наука, 1966. - pp. 228-259 [Russian]
  11. Спицын В.И., Мартыненко Л.И. Неорганическая химия. - Ч.1. - М.: ИМУ, 1991. - pp. 50 [Russian]
  12. Успехи химии. - 1960. - Т.29, №11. - pp. 1388-1406 [Russian]
  13. Успехи химии. - 1968. - Т.37, №2. - pp. 193-215 [Russian]
  14. Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 211 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru