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Properties of substance:
rhodium
Group of substances:
inorganic
Physical appearance:
cubic metal
Empirical formula (Hill's system for organic substances):
Rh
Structural formula as text:
Rh
Molar/atomic mass: 102.91
Melting point (°C):
1963
Boiling point (°C):
3700
Solubility (g/100 g of solvent):
mercury
: insoluble [
Ref.
]
water
: insoluble [
Ref.
]
Numerical data:
Year of discovery: 1803
Density:
12.44 (20°C, g/cm
3
)
Half-life:
100
45
Rh = 20.8 hasа (electron capture (95.1%), β
+
(4.9%))
100m
45
Rh = 214.0 ns (internal transition (100%))
100n
45
Rh = 4.6 min (internal transition (about 98.3%), β
+
(about 1.7%))
100p
45
Rh = 130 ns (internal transition (100%))
101
45
Rh = 3.3 y (electron capture (100%))
101m
45
Rh = 4.34 d (electron capture (92.8%), internal transition (7.8%))
102
45
Rh = 207.0 d (β
+
(78%), β
-
(22%))
102m
45
Rh = 3.742 y (β
+
(about 100%), internal transition (0.233%))
103
45
Rh = stable ( (isotopic abundance 100%))
103m
45
Rh = 56.114 min (internal transition (100%))
104
45
Rh = 42.3 s (β
-
(about 100%), β
+
(0.45%))
104m
45
Rh = 4.34 min (internal transition (about 100%), β
-
(0.13%))
105
45
Rh = 35.357 h (β
-
(100%))
105m
45
Rh = 42.9 s (internal transition (100%))
106
45
Rh = 30.07 s (β
-
(100%))
106m
45
Rh = 131 min (β
-
(100%))
107
45
Rh = 21.7 min (β
-
(100%))
108
45
Rh = 16.8 s (β
-
(100%))
108m
45
Rh = 6.0 min (β
-
(100%))
109
45
Rh = 80 s (β
-
(100%))
109m
45
Rh = 1.66 μs (internal transition (100%))
110
45
Rh = 3.35 s (β
-
(100%))
110m
45
Rh = 28.5 s (β
-
(100%))
111
45
Rh = 11 s (β
-
(100%))
112
45
Rh = 3.4 s (β
-
(100%))
112m
45
Rh = 6.73 s (β
-
(100%))
113
45
Rh = 2.80 s (β
-
(100%))
114
45
Rh = 1.85 s (β
-
(100%))
115
45
Rh = 990 ms (β
-
(100%), β
-
n)
116
45
Rh = 685 ms (β
-
(100%), β
-
n)
116m
45
Rh = 570 ms (β
-
(100%))
117
45
Rh = 421 ms (β
-
(100%), β
-
n)
118
45
Rh = 284 ms (β
-
(100%), β
-
n (3.1%))
119
45
Rh = 190 ms (β
-
(100%), β
-
n (6.4%))
120
45
Rh = 129.6 ms (β
-
(100%), β
-
n )
121
45
Rh = 76 ms (β
-
(100%), β
-
n)
122
45
Rh = 51 ms (β
-
(100%), β
-
n. β
-
2n)
123
45
Rh = 42 ms (β
-
(100%), β
-
n)
124
45
Rh = 30 ms (β
-
(100%), β
-
n)
125
45
Rh = 26.5 ms (β
-
(100%), β
-
n)
126
45
Rh = 19 ms (β
-
(100%), β
-
n)
127
45
Rh = 28 ms (β
-
(100%), β
-
n)
90
45
Rh = 15 ms (β
+
(100%))
90m
45
Rh = 1.1 s (β
+
(100%))
91
45
Rh = 1.6 s (β
+
(100%), β
+
p (1.3%))
91m
45
Rh = 1.46 s (β
+
(100%))
92
45
Rh = 4.66 s (β
+
(100%), β
+
p (1.9%))
92m
45
Rh = 0.53 s (β
+
(100%))
93
45
Rh = 13.9 s (β
+
(100%))
94
45
Rh = 70.6 s (β
+
(100%), β
+
p (1.8%))
94m
45
Rh = 480 ns (internal transition (100%))
94n
45
Rh = 25.8 s (β
+
(100%))
95
45
Rh = 5.02 min (β
+
(100%))
95m
45
Rh = 1.96 min (internal transition (88%), β
+
(12%))
96
45
Rh = 9.90 min (β
+
(100%))
96m
45
Rh = 1.51 min (internal transition (60%), β
+
(40%))
97
45
Rh = 30.7 min (β
+
(100%))
97m
45
Rh = 46.2 min (β
+
(94.4%), internal transition (5.6%))
98
45
Rh = 8.72 min (β
+
(100%))
98m
45
Rh = 3.6 min (internal transition (89%), β
+
(11%))
99
45
Rh = 16.1 d (β
+
(100%))
99m
45
Rh = 4.7 hasа (β
+
(about 100%))
Vapour pressure (Torr):
0.01 (2030°C)
0.1 (2256°C)
1 (2520°C)
10 (2840°C)
100 (3270°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)):
31.5 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
25 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
21.5
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
495.8
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
556 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
185.7 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
21 (g)
References:
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
Природа. - 1994. - №4. - pp. 70 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 92 [Russian]
Реми Г. Курс неорганической химии. - Т.2. - М., 1966. - pp. 354-355 [Russian]
Федоров И.А. Родий. - М.: Наука, 1966. - pp. 5-26 [Russian]
Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 270-271 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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