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Properties of substance:

berkelium

Group of substances:

inorganic

Physical appearance:

metal

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

Bk

Structural formula as text:

Bk

Molar/atomic mass: 247

Melting point (°C):

986

Boiling point (°C):

2630

Numerical data:

Year of discovery: 1949

Density:

14.78 (25°C, g/cm3)

Half-life:

23497Bk = 2.43 min (α (> 80%), β+ (< 20%))
23897Bk = 2.40 min (β+ (about 100%), β+spontaneous fission (0.048%))
24097Bk = 4.8 min ()
24197Bk = 4.6 min ()
24297Bk = 7.0 min (β+ (about 100%))
24397Bk = 4.5 h (β+ (about 100%), α (about 0.15%))
24497Bk = 4.35 h ()
244m97Bk = 820 ns (spontaneous fission (about 100%))
24597Bk = 4.95 d (electron capture (about 100%), α (0.12%))
24697Bk = 1.80 d (β+ (about 100%))
24797Bk = 1 380 y (α (about 100%))
24897Bk = > 9 y ()
248m97Bk = 23.7 h (β- (70%), electron capture (30%))
24997Bk = 330 d (β- (about 100%), α (0.00145%))
249m97Bk = 300 μs (internal transition (100%))
25097Bk = 3.212 hasа (β- (100%))
250m97Bk = 29 μs (internal transition (100%))
25197Bk = 55.6 min (β- (100%))
251m97Bk = 58 μs (internal transition (100%))
25297Bk = 1.8 min ()

Electrode potential:

Bk3+ + 3e- → Bk, E = -2 V (water, 25°C)
Bk4+ + e- → Bk3+, E = 1.67 V (water, 25°C)

References:

  1. Вредные химические вещества: Радиоактивные вещества. Справочник. - Л., 1990. - pp. 222 [Russian]
  2. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 581 [Russian]
  3. Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 282-283 [Russian]
  4. Химия актиноидов. - Т.2. - М.: Мир, 1997. - pp. 519-531 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru