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Properties of substance:
terbium
Group of substances:
inorganic
Physical appearance:
hexagonal metal
Empirical formula (Hill's system for organic substances):
Tb
Structural formula as text:
Tb
Molar/atomic mass: 158.93
Melting point (°C):
1360
Boiling point (°C):
3200
Solubility (g/100 g of solvent):
mercury
: 0.0001 (20°C) [
Ref.
]
Numerical data:
Year of discovery: 1843
Density:
8.25 (20°C, g/cm
3
)
Half-life:
135
65
Tb = 1.01 ms (p (about 100%))
139
65
Tb = 1.6 s (β
+
(100%), β
+
p (?))
140
65
Tb = 2.32 s (β
+
(100%), β
+
p (0.26%))
141
65
Tb = 3.5 s (β
+
(100%))
141m
65
Tb = 7.9 s (β
+
(100%))
142
65
Tb = 597 ms (β
+
(100%), β
+
p (0.0022%))
142m
65
Tb = 303 ms (internal transition (100%))
142n
65
Tb = 26 μs (internal transition (100%))
143
65
Tb = 12 s (β
+
(100%))
144
65
Tb = 1 s (β
+
(100%))
144m
65
Tb = 4.25 s (internal transition (66%), β
+
(34%))
144n
65
Tb = 2.8 μs (internal transition (100%))
144p
65
Tb = 670 ns (internal transition (100%))
145
65
Tb = 30.9 s (β
+
(100%))
146
65
Tb = 8 s (β
+
(100%))
146m
65
Tb = 24.1 s (β
+
(100%))
146n
65
Tb = 1.18 ms (internal transition (100%))
147
65
Tb = 1.64 h (β
+
(100%))
147m
65
Tb = 1.87 min (β
+
(100%))
148
65
Tb = 60 min (β
+
(100%))
148m
65
Tb = 2.20 min (β
+
(100%))
148n
65
Tb = 1.310 μs (internal transition (100%))
149
65
Tb = 4.118 h (β
+
(83.3%), α (16.7%))
149m
65
Tb = 4.16 min (β
+
(about 100%), α (0.022%))
150
65
Tb = 3.48 h (β
+
(about 100%), α )
150m
65
Tb = 5.8 min (β
+
(about 100%))
151
65
Tb = 17.609 h (β
+
(about 100%), α (0.0095%))
151m
65
Tb = 25 s (internal transition (93.4%), β
+
(6.6%))
152
65
Tb = 17.5 h (β
+
(100%))
152m
65
Tb = 960 ns (internal transition (100%))
152n
65
Tb = 4.2 min (internal transition (78.9%), β
+
(21.1%))
153
65
Tb = 2.34 d (β
+
(100%))
153m
65
Tb = 186 μs (internal transition (100%))
154
65
Tb = 21.5 h (β
+
(about 100%))
154m
65
Tb = 9.994 h (β
+
(78.2%), internal transition (21.8%))
154n
65
Tb = 22.7 h (β
+
(98.2%), internal transition (1.8%))
154p
65
Tb = 513 ns ()
155
65
Tb = 5.32 d (electron capture (100%))
156
65
Tb = 5.35 d (β
+
(about 100%))
156m
65
Tb = 24.4 h (internal transition (100%))
156n
65
Tb = 5.3 h ()
157
65
Tb = 71 y (electron capture (100%))
158
65
Tb = 180 y (β
+
(83.4%), β
-
(16.6%))
158m
65
Tb = 10.70 s (internal transition (about 100%))
158n
65
Tb = 400 μs (internal transition (100%))
159
65
Tb = stable ( (isotopic abundance 100%))
160
65
Tb = 72.3 d (β
-
(100%))
161
65
Tb = 6.89 d (β
-
(100%))
162
65
Tb = 7.60 min (β
-
(100%))
163
65
Tb = 19.5 min (β
-
(100%))
164
65
Tb = 3.0 min (β
-
(100%))
165
65
Tb = 2.11 min (β
-
(100%))
166
65
Tb = 27.1 s (β
-
(100%))
167
65
Tb = 18.9 s (β
-
(100%))
168
65
Tb = 9.4 s (β
-
(100%))
168m
65
Tb = 710 ns (internal transition (100%))
169
65
Tb = 5.13 s (β
-
(100%), β
-
n)
170
65
Tb = 960 ms (β
-
(100%), β
-
n)
171
65
Tb = 1.23 s (β
-
(100%), β
-
n)
172
65
Tb = 760 ms (β
-
(100%), β
-
n)
Electrode potential:
Tb
3+
+ 3e
-
→ Tb, E = -2.31 V (water, 25°C)
Tb
4+
+ e
-
→ Tb
3+
, E = 3.1 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)):
73.2 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
28.95 (s)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
389 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
202 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
26.9 (g)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
10.8
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
331
References:
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 104 [Russian]
Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 531-532 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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