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Properties of substance:
actinium
Group of substances:
inorganic
Physical appearance:
cubic metal
Empirical formula (Hill's system for organic substances):
Ac
Structural formula as text:
Ac
Molar/atomic mass: 227
Melting point (°C):
1050
Boiling point (°C):
3590
Solubility (g/100 g of solvent):
water
: reaction [
Ref.
]
Numerical data:
Year of discovery: 1899
Density:
10.07 (20°C, g/cm
3
)
Half-life:
205
89
Ac = 80 ms (α (about 100%))
206
89
Ac = 25 ms (α (about 100%))
206m
89
Ac = 41 ms (α (about 100%))
207
89
Ac = 31 ms (α (about 100%))
208
89
Ac = 97 ms ()
208m
89
Ac = 28 ms ()
209
89
Ac = 94 ms ()
210
89
Ac = 350 ms ()
211
89
Ac = 213 ms (α (about 100%))
212
89
Ac = 895 ms ()
213
89
Ac = 738 ms ()
214
89
Ac = 8.2 s (α (> 89%), β
+
(< 11%))
215
89
Ac = 170 ms (α (about 100%), β
+
(0.09%))
216
89
Ac = 440 μs (α (100%), β
+
)
217
89
Ac = 69 ns (α (100%), β
+
(0.000 000 006 9%))
218
89
Ac = 1.00 μs (α (100%))
219
89
Ac = 11.8 μs (α (100%))
220
89
Ac = 26.36 ms (α (100%))
221
89
Ac = 52 ms (α (100%))
222
89
Ac = 5.0 s (α (99%), β
+
(1%))
223
89
Ac = 2.10 min (α (99%), electron capture (1%))
224
89
Ac = 2.78 h (β
+
(90.6%), α (9.4%))
225
89
Ac = 9.920 d (α (100%), heavy cluster emission
14
C (4.5·10
-12
%))
226
89
Ac = 29.37 h (β
-
(83%), electron capture (17%), α (0.006%))
227
89
Ac = 21.772 y (β
-
(98.62%), α (1.38%))
228
89
Ac = 6.15 h (β
-
(100%))
229
89
Ac = 62.7 min (β
-
(100%))
230
89
Ac = 122 s (β
-
(100%))
231
89
Ac = 7.5 min (β
-
(100%))
232
89
Ac = 1.98 min (β
-
(100%))
233
89
Ac = 145 s (β
-
(100%))
234
89
Ac = 45 s (β
-
(100%))
235
89
Ac = 62 s ()
236
89
Ac = 4.5 min ()
Electrode potential:
Ac
3+
+ 3e
-
→ Ac, E = -2.6 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)):
56 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
27 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
12
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
378
References:
Patnaik P. Handbook of inorganic chemicals. - McGraw-Hill, 2003. - pp. 1
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 50 [Russian]
Каралова З.К., Мясоедов Б.Ф. Актиний. - М.: Наука, 1982 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 52 [Russian]
Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 20 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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