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Properties of substance:
americium
Group of substances:
inorganic
Physical appearance:
metal
Empirical formula (Hill's system for organic substances):
Am
Structural formula as text:
Am
Molar/atomic mass: 243
Melting point (°C):
1173
Boiling point (°C):
2607
Solubility (g/100 g of solvent):
ammonia liquid
: insoluble [
Ref.
]
Numerical data:
Year of discovery: 1944
Density:
13.67 (20°C, g/cm
3
)
Half-life:
230
95
Am = 1.4 min (β
+
(100%))
232
95
Am = 1.31 min ()
233
95
Am = 3.2 min ()
234
95
Am = 2.32 min (β
+
(about 100%), α (0.039%))
235
95
Am = 10.3 min (β
+
(about 100%), α (0.4%))
236
95
Am = 3.6 min ()
236m
95
Am = 2.9 min ()
237
95
Am = 73.6 min (β
+
(about 100%), α (0.025%))
238
95
Am = 98 min (β
+
(about 100%), α (0.00011%))
238m
95
Am = 35 μs (spontaneous fission (about 100%))
239
95
Am = 11.9 h (electron capture (about 100%), α (0.010%))
239m
95
Am = 163 ns (spontaneous fission (about 100%))
240
95
Am = 50.8 h (β
+
(about 100%), α (0.00019%))
240m
95
Am = 940 μs (spontaneous fission (about 100%))
241
95
Am = 432.6 y (α (about 100%), spontaneous fission (0.0000000036%))
241m
95
Am = 1.2 μs (spontaneous fission (100%))
242
95
Am = 16.02 h (β
-
(82.7%), electron capture (17.3%))
242m
95
Am = 141 y (internal transition (about 100%), α (0.45%), spontaneous fission (< 0.0000000047%))
242n
95
Am = 14.0 ms (spontaneous fission (about 100%))
243
95
Am = 7 370 y (α (about 100%), spontaneous fission (0.0000000037%))
243m
95
Am = 5.5 μs (spontaneous fission (about 100%))
244
95
Am = 10.1 h (β
-
(100%))
244m
95
Am = 26 min (β
-
(about 100%), electron capture (0.0361%))
244n
95
Am = 900 μs (spontaneous fission (about 100%))
244p
95
Am = 6.5 μs (spontaneous fission (about 100%))
245
95
Am = 2.05 h (β
-
(100%))
245m
95
Am = 640 ns (spontaneous fission (about 100%))
246
95
Am = 39 min (β
-
(100%))
246m
95
Am = 25.0 min (β
-
(about 100%))
246n
95
Am = 73 μs (spontaneous fission (about 100%))
247
95
Am = 23.0 min (β
-
(100%))
248
95
Am = about 3 min ()
Electrode potential:
Am
3+
+ 3e
-
→ Am, E = -2.07 V (water, 25°C)
Am
4+
+ 4e
-
→ Am, E = -0.9 V (water, 25°C)
Am
4+
+ e
-
→ Am
3+
, E = 2.181 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
0 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
0 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
54.84 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
25.85 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
1437
References:
Perry D.L. Handbook of Inorganic Compounds. - 2nd ed. - CRC Press, 2011. - pp. 15
Вредные химические вещества: Радиоактивные вещества. Справочник. - Л., 1990. - pp. 208-209 [Russian]
Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 125-126 [Russian]
Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 32 [Russian]
Химия актиноидов. - Т.2. - М.: Мир, 1997. - pp. 407-422 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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