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Properties of substance:
holmium
Group of substances:
inorganic
Physical appearance:
gray hexagonal metal
Empirical formula (Hill's system for organic substances):
Ho
Structural formula as text:
Ho
Molar/atomic mass: 164.93
Melting point (°C):
1500
Boiling point (°C):
2700
Solubility (g/100 g of solvent):
water
: reaction [
Ref.
]
Numerical data:
Year of discovery: 1879
Half-life:
140
67
Ho = 6 ms ()
141
67
Ho = 4.1 ms ()
141m
67
Ho = 7.3 μs (p (100%))
142
67
Ho = 400 ms (β
+
(about 100%), β
+
p (?))
144
67
Ho = 700 ms (β
+
(100%), β
+
p (?))
144m
67
Ho = 519 ns (internal transition (100%))
145
67
Ho = 2.4 s (β
+
(100%))
146
67
Ho = 2.8 s (β
+
(100%), β
+
p (?))
147
67
Ho = 5.8 s (β
+
(100%))
147m
67
Ho = 315 ns (internal transition (100%))
148
67
Ho = 2.2 s (β
+
(100%))
148m
67
Ho = 9.49 s (β
+
(100%), β
+
p (0.08%))
148n
67
Ho = 2.36 ms (internal transition (100%))
149
67
Ho = 21.1 s (β
+
(100%))
149m
67
Ho = 56 s (β
+
(100%))
150
67
Ho = 76.8 s (β
+
(100%))
150m
67
Ho = 23.3 s (β
+
(100%))
150n
67
Ho = 787 ns (internal transition (100%))
151
67
Ho = 35.2 s (β
+
(?), α (22%))
151m
67
Ho = 47.2 s (α (77%))
152
67
Ho = 161.8 s (β
+
(88%), α (12%))
152m
67
Ho = 49.8 s (β
+
(89.2%), α (10.8%))
152n
67
Ho = 8.4 μs (internal transition (100%))
153
67
Ho = 2.01 min (β
+
(about 100%), α (0.051%))
153m
67
Ho = 9.3 min (β
+
(about 100%), α (0.18%))
153n
67
Ho = 229 ns (internal transition (100%))
154
67
Ho = 11.76 min (β
+
(about 100%), α (0.019%))
154m
67
Ho = 3.10 min (β
+
(100%))
155
67
Ho = 48 min (β
+
(100%))
155m
67
Ho = 880 μs (internal transition (100%))
156
67
Ho = 56 min (β
+
(100%))
156m
67
Ho = 9.5 s (internal transition (about 100%))
156n
67
Ho = 7.6 min (β
+
(75%))
157
67
Ho = 12.6 min (β
+
(100%))
158
67
Ho = 11.3 min (β
+
(about 100%))
158m
67
Ho = 28 min (internal transition (> 81%), β
+
(< 19%))
158n
67
Ho = 21.3 min (β
+
(> 93%), internal transition (< 7%))
159
67
Ho = 33.05 min (β
+
(100%))
159m
67
Ho = 8.30 s (internal transition (100%))
160
67
Ho = 25.6 min (β
+
(100%))
160m
67
Ho = 3 s (internal transition (100%))
160m
67
Ho = 5.02 h (internal transition (73%), β
+
(27%))
161
67
Ho = 2.48 h (electron capture (100%))
161m
67
Ho = 6.76 s (internal transition (100%))
162
67
Ho = 15.0 min (β
+
(100%))
162m
67
Ho = 67.0 min (internal transition (62%), β
+
(38%))
163
67
Ho = 4 570 y (electron capture (100%))
163m
67
Ho = 1.09 s (internal transition (100%))
163n
67
Ho = 800 ns (internal transition (100%))
164
67
Ho = 29 min (electron capture (60%), β
-
(40%))
164m
67
Ho = 36.4 min (internal transition (100%))
165
67
Ho = stable ( (isotopic abundance 100%))
165m
67
Ho = 1.512 μs (internal transition (100%))
166
67
Ho = 26.824 h (β
-
(100%))
166m
67
Ho = 1 133 y (β
-
(100%))
166n
67
Ho = 185 μs (internal transition (100%))
167
67
Ho = 3.1 h (β
-
(100%))
167m
67
Ho = 6.0 μs (internal transition (100%))
168
67
Ho = 2.99 min (β
-
(100%))
168m
67
Ho = 132 s (internal transition (about 100%))
168p
67
Ho = 108 ns (internal transition (100%))
169
67
Ho = 4.72 min (β
-
(100%))
169m
67
Ho = 118 μs (internal transition (100%))
170
67
Ho = 2.76 min (β
-
(100%))
170m
67
Ho = 43 s (β
-
(100%))
171
67
Ho = 53 s (β
-
(100%))
172
67
Ho = 25 s (β
-
(100%))
173
67
Ho = 6.90 s (β
-
(100%))
174
67
Ho = 3.2 s (β
-
(100%))
175
67
Ho = 1.88 s (β
-
(100%))
Electrode potential:
Ho
3+
+ 3e
-
→ Ho, E = -2.319 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)):
74.9 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
27 (s)
References:
Волков В.А., Вонский Е.В., Кузнецова Г.И. Выдающиеся химики мира. - М.: Высшая школа, 1991. - pp. 208-209 [Russian]
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 50 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 62 [Russian]
Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 590-591 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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