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Properties of substance:
curium
Group of substances:
inorganic
Physical appearance:
metal
Empirical formula (Hill's system for organic substances):
Cm
Structural formula as text:
Cm
Molar/atomic mass: 247
Melting point (°C):
1340
Boiling point (°C):
3267
Numerical data:
Year of discovery: 1944
Density:
13.51 (25°C, g/cm
3
)
Half-life:
233
96
Cm = 27 s (β
+
(80%), α (20%))
234
96
Cm = 52 s (β
+
(about 71%), α (about 27%), spontaneous fission (about 2%))
236
96
Cm = 6.8 min (β
+
(82%), α (18%))
238
96
Cm = 2.2 h ()
239
96
Cm = 2.5 h (β
+
(about 100%), α (0.0062%))
240
96
Cm = 27 d (α (about 100%), spontaneous fission (0.000 003 9%))
241
96
Cm = 32.8 d (electron capture (99.0%), α (1.0%))
242
96
Cm = 162.8 d (α (100%), spontaneous fission (0.000 006 2%), heavy cluster emission
34
Si (1.1·10
-14
%))
242m
96
Cm = 120 ns ()
243
96
Cm = 29.1 y (α (about 100%), electron capture (0.29%), spontaneous fission (5.9·10
-9
%))
243m
96
Cm = 1.08 μs (internal transition (100%))
244
96
Cm = 18.10 y (α (100%), spontaneous fission (1.37·10
-4
%))
244m
96
Cm = 34 ms (internal transition (100%))
245
96
Cm = 8250 y (α (100%), spontaneous fission (6.1·10
-7
%))
245m
96
Cm = 290 ns (internal transition (100%))
246
96
Cm = 4706 y (α (about 100%), spontaneous fission (0.02615%))
246m
96
Cm = 1.12 s (internal transition (100%))
247
96
Cm = 15 000 000 y (α (100%))
247m
96
Cm = 26.3 μs (internal transition (100%))
248
96
Cm = 348 000 y (α (91.61%), spontaneous fission (8.39%))
248m
96
Cm = 146 μs (internal transition (100%))
Electrode potential:
Cm
3+
+ 3e
-
→ Cm, E = -2.06 V (water, 25°C)
Cm
4+
+ e
-
→ Cm
3+
, E = 3.1 V (water, 25°C)
References:
Вредные химические вещества: Радиоактивные вещества. Справочник. - Л., 1990. - pp. 216 [Russian]
Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 581 [Russian]
Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 560 [Russian]
Химия актиноидов. - Т.2. - М.: Мир, 1997. - pp. 489-498 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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