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Properties of substance:
technetium
Group of substances:
inorganic
Physical appearance:
hexagonal metal
Empirical formula (Hill's system for organic substances):
Tc
Structural formula as text:
Tc
Molar/atomic mass: 98.91
Melting point (°C):
2200
Boiling point (°C):
4600
Solubility (g/100 g of solvent):
water
: insoluble [
Ref.
]
Numerical data:
Year of discovery: 1937
Superconducting temperature (K): 7.8
Density:
11.49 (20°C, g/cm
3
)
Half-life:
100
43
Tc = 15.46 s (β
-
(about 100%), electron capture (0.0018%))
100m
43
Tc = 8.32 μs (internal transition (100%))
101
43
Tc = 14.22 min (β
-
(100%))
101m
43
Tc = 636 μs (internal transition (100%))
102
43
Tc = 5.28 s (β
-
(100%))
102m
43
Tc = 4.35 min (β
-
(98%), internal transition (2%))
103
43
Tc = 54.2 s (β
-
(100%))
104
43
Tc = 18.3 min (β
-
(100%))
104m
43
Tc = 3.5 μs (internal transition (100%))
105
43
Tc = 7.6 min (β
-
(100%))
106
43
Tc = 35.6 s (β
-
(100%))
107
43
Tc = 21.2 s (β
-
(100%))
107m
43
Tc = 3.85 μs (internal transition (100%))
107n
43
Tc = 184 ns (internal transition (100%))
108
43
Tc = 5.17 s (β
-
(100%))
109
43
Tc = 1.14 s (β
-
(100%), β
-
n (0.08%))
110
43
Tc = 900 ms (β
-
(100%), β
-
n (0.04%))
111
43
Tc = 350 ms (β
-
(100%), β
-
n (0.85%))
112
43
Tc = 323 ms (β
-
(100%), β
-
n (1.5%))
113
43
Tc = 152 ms (β
-
(100%), β
-
n (2.1%))
114
43
Tc = 90 ms (β
-
(100%), β
-
n)
115
43
Tc = 78 ms (β
-
(100%), β
-
n)
116
43
Tc = 57 ms (β
-
(100%), β
-
n)
117
43
Tc = 44.5 ms (β
-
(100%), β
-
n)
118
43
Tc = 30 ms (β
-
(100%), β
-
n)
119
43
Tc = 22 ms (β
-
(100%), β
-
n)
120
43
Tc = 21 ms (β
-
(100%), β
-
n)
121
43
Tc = 22 ms (β
-
(100%), β
-
n)
86
43
Tc = 55 ms (β
+
(100%))
86m
43
Tc = 1.10 μs (internal transition (100%))
87
43
Tc = 2.2 s (β
+
(100%))
87n
43
Tc = 647 ns (internal transition (100%))
88
43
Tc = 6.4 s (β
+
(100%))
88m
43
Tc = 5.8 s (β
+
(100%))
88n
43
Tc = 145 ns (internal transition (100%))
89
43
Tc = 12.8 s (β
+
(100%))
89m
43
Tc = 12.9 s (β
+
(about 100%))
90
43
Tc = 49.2 s (β
+
(100%))
90m
43
Tc = 8.7 s (β
+
(100%))
91
43
Tc = 3.14 min (β
+
(100%))
91m
43
Tc = 3.3 min (β
+
(about 100%))
92
43
Tc = 4.25 min (β
+
(100%))
92m
43
Tc = 1.03 μs (internal transition (100%))
93
43
Tc = 2.75 h (β
+
(100%))
93m
43
Tc = 43.5 min (internal transition (77.4%), β
+
(22.6%))
93n
43
Tc = 10.2 μs (internal transition (100%))
94
43
Tc = 293 min (β
+
(100%))
94m
43
Tc = 52.0 min (β
+
(about 100%))
95
43
Tc = 20.0 h (β
+
(100%))
95m
43
Tc = 61 день (β
+
(96.12%), internal transition (3.88%))
96
43
Tc = 4.28 d (β
+
(100%))
96m
43
Tc = 51.5 min (internal transition (98.0%), β
+
(2.0%))
97
43
Tc = 4 210 000 y (electron capture (100%))
97m
43
Tc = 91.0 день (internal transition (96.06%), electron capture (3.94%))
98
43
Tc = 4 200 000 y (β
-
(100%))
98m
43
Tc = 14.7 μs (internal transition (100%))
99
43
Tc = 211 100 y (β
-
(100%))
99m
43
Tc = 6.0067 h (internal transition (about 100%), β
-
(0.0037%))
Vapour pressure (Torr):
1 (3100°C)
10 (3500°C)
100 (4100°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)):
33.5 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
24.3 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
24
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
593
References:
Бекман И.Н. Радиохимия. Том II: Радиоактивные элементы. - М.: Издатель Мархитин П.Ю., 2014. - pp. 27-32 [Russian]
Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 373-374 [Russian]
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
Лаврухина А.К., Поздняков А.А. Аналитическая химия технеция, прометия, астатина и франция. - М.: Наука, 1966. - pp. 7-22 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 104 [Russian]
Успехи химии. - 1961. - Т.30, №2. - pp. 274-291 [Russian]
Успехи химии. - 1977. - Т.46, №11. - pp. 1958 [Russian]
Успехи химии. - 2003. - Т.72, №2. - pp. 115-137 [Russian]
Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 560-561 [Russian]
Энциклопедия для детей. - Т.17: Химия. - М.: Аванта+, 2004. - pp. 268 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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