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Properties of substance:
praseodymum
Group of substances:
inorganic
Physical appearance:
hexagonal metal
Empirical formula (Hill's system for organic substances):
Pr
Structural formula as text:
Pr
Molar/atomic mass: 140.91
Melting point (°C):
932
Boiling point (°C):
3510
Solubility (g/100 g of solvent):
mercury
: 0.013 (20°C) [
Ref.
]
Numerical data:
Year of discovery: 1885
Density:
6.77 (20°C, g/cm
3
)
Half-life:
121
59
Pr = 12 ms (p (about 100%))
124
59
Pr = 1.2 s (β
+
(100%), β
+
p (?))
125
59
Pr = 3.3 s (β
+
(100%), β
+
p (?))
126
59
Pr = 3.12 s (β
+
(100%), β
+
p (?))
127
59
Pr = 4.2 s (β
+
(100%))
128
59
Pr = 2.85 s (β
+
(100%), β
+
p (?))
129
59
Pr = 30 s (β
+
(100%))
130
59
Pr = 40.0 s (β
+
(100%))
131
59
Pr = 1.50 min (β
+
(100%))
131m
59
Pr = 5.73 s (internal transition (96.4%), β
+
(3.6%))
132
59
Pr = 1.49 min (β
+
(100%))
132n
59
Pr = 2.46 μs (internal transition (100%))
132p
59
Pr = 486 ns (internal transition (100%))
133
59
Pr = 6.5 min (β
+
(100%))
133m
59
Pr = 1.1 s (internal transition (100%))
134
59
Pr = 17 min (β
+
(100%))
134m
59
Pr = 11 min (β
+
(100%))
135
59
Pr = 24 min (β
+
(100%))
135m
59
Pr = 105 μs (internal transition (100%))
136
59
Pr = 13.1 min (β
+
(100%))
137
59
Pr = 1.28 h (β
+
(100%))
137m
59
Pr = 2.66 μs (internal transition (100%))
138
59
Pr = 1.45 min (β
+
(100%))
138m
59
Pr = 2.12 h (β
+
(100%))
139
59
Pr = 4.41 h (β
+
(100%))
140
59
Pr = 3.39 min (β
+
(100%))
140m
59
Pr = 350 ns (internal transition (100%))
140n
59
Pr = 3.05 μs (internal transition (100%))
141
59
Pr = stable ( (isotopic abundance 100%))
142
59
Pr = 19.12 h (β
-
(about 100%), electron capture (0.0164%))
142m
59
Pr = 14.6 min (internal transition (100%))
143
59
Pr = 13.57 d (β
-
(100%))
144
59
Pr = 17.28 min (β
-
(100%))
144m
59
Pr = 7.2 min (internal transition (about 100%), β
-
(0.07%))
145
59
Pr = 5.984 h (β
-
(100%))
146
59
Pr = 24.15 min (β
-
(100%))
147
59
Pr = 13.4 min (β
-
(100%))
148
59
Pr = 2.29 min (β
-
(100%))
148m
59
Pr = 2.01 min (β
-
(64%), internal transition (36%))
149
59
Pr = 2.26 min (β
-
(100%))
150
59
Pr = 6.19 s (β
-
(100%))
151
59
Pr = 18.90 s (β
-
(100%))
152
59
Pr = 3.57 s (β
-
(100%))
152m
59
Pr = 4.1 μs (internal transition (100%))
153
59
Pr = 4.28 s (β
-
(100%), β
-
n)
154
59
Pr = 2.3 s (β
-
(100%), β
-
n)
155
59
Pr = 1.47 s (β
-
(100%), β
-
n)
156
59
Pr = 444 ms (β
-
(100%), β
-
n)
157
59
Pr = 307 ms (β
-
(100%), β
-
n)
158
59
Pr = 181 ms (β
-
(100%), β
-
n)
159
59
Pr = 134 ms (β
-
(100%), β
-
n)
160
59
Pr = 170 ms (β
-
(100%))
Electrode potential:
Pr
3+
+ e
-
→ Pr
2+
, E = -3.1 V (water, 25°C)
Pr
3+
+ e
-
→ Pr, E = -2.353 V (water, 25°C)
Pr
2+
+ e
-
→ Pr, E = -2 V (water, 25°C)
Pr
4+
+ e
-
→ Pr
3+
, E = 3.2 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)):
73.6 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
28.5 (s)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
356 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
189.7 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
21.4 (g)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
6.9
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
297
References:
Handbook of Chemistry and Physics. - CRC Press, Inc., 2002
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. 91 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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