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Properties of substance:

einsteinium

Group of substances:

inorganic

Physical appearance:

cubic metal

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

Es

Structural formula as text:

Es

Molar/atomic mass: 252

Melting point (°C):

860

Numerical data:

Year of discovery: 1952

Half-life:

24199Es = 10 s ()
24299Es = 17.8 s (α (57%), β+ (43%))
24399Es = 21.6 s (α (61%), β+ (39%))
24499Es = 37 s ()
24599Es = 1.1 min (α (40%))
24699Es = 7.5 min (β+ (90.1%), α (9.9%))
24799Es = 4.55 min (β+ (93%), α (7%))
24899Es = 27 min (β+ (about 100%), α (about 0.25%))
24999Es = 102.2 min (β+ (99.43%), α (0.57%))
25099Es = 8.6 h (β+ (> 97%))
250m99Es = 2.22 h (β+ (about 100%))
25199Es = 33 h ()
25299Es = 471.7 d (α (78%), electron capture (22%))
25399Es = 20.47 d (α (почти 100%), spontaneous fission (0.000 001%))
25499Es = 275.7 d (α (почти 100%))
25599Es = 39.8 d (β- (92%), α (8%), spontaneous fission (0.0041%))
25699Es = 25.4 min (β- (100%))
25799Es = 7.7 d (β- (100%), α (about 0.0004%))

Electrode potential:

Es2+ + 2e- → Es, E = -2.2 V (water, 25°C)
Es3+ + 3e- → Es, E = -2 V (water, 25°C)
Es3+ + e- → Es2+, E = -1.5 V (water, 25°C)
Es4+ + e- → Es3+, E = 4.5 V (water, 25°C)

References:

  1. Dean J.A. Lange's handbook of chemistry. - 1999. - pp. 8.127
  2. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 405 [Russian]
  3. Химия актиноидов. - Т.2. - М.: Мир, 1997. - pp. 608-614 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru