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|
Rhodium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Rh | 45 | 102.905 | 1964 °C | 3695 °C | Solid | 12.41 g/cm3 | Noble Metal |
|
|
|
| General |
| Name, Symbol, Number |
rhodium, Rh, 45 |
| Chemical series |
transition metals |
| Group, Period, Block |
9, 5, d |
| Appearance |
silvery white metallic
 |
| Standard atomic weight |
102.90550(2) g·mol−1 |
| Electron configuration |
[Kr] 4d8 5s1 |
| Electrons per shell |
2, 8, 18, 16, 1 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
12.41 g·cm−3 |
| Liquid density at m.p. |
10.7 g·cm−3 |
| Melting point |
2237 K
(1964 °C, 3567 °F) |
| Boiling point |
3968 K
(3695 °C, 6683 °F) |
| Heat of fusion |
26.59 kJ·mol−1 |
| Heat of vaporization |
494 kJ·mol−1 |
| Heat capacity |
(25 °C) 24.98 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
2288 |
2496 |
2749 |
3063 |
3405 |
3997 |
|
| Atomic properties |
| Crystal structure |
cubic face centered |
| Oxidation states |
2, 3, 4
(amphoteric oxide) |
| Electronegativity |
2.28 (scale Pauling) |
| Ionization energies |
1st: 719.7 kJ/mol |
| 2nd: 1740 kJ/mol |
| 3rd: 2997 kJ/mol |
| Atomic radius |
135 pm |
| Atomic radius (calc.) |
173 pm |
| Covalent radius |
135 pm |
| Miscellaneous |
| Magnetic ordering |
no data |
| Electrical resistivity |
(0 °C) 43.3 nΩ·m |
| Thermal conductivity |
(300 K) 150 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 8.2 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 4700 m/s |
| Young's modulus |
275 GPa |
| Shear modulus |
150 GPa |
| Bulk modulus |
380 GPa |
| Poisson ratio |
0.26 |
| Mohs hardness |
6.0 |
| Vickers hardness |
1246 MPa |
| Brinell hardness |
1100 MPa |
| CAS registry number |
7440-16-6 |
| Selected isotopes |
Main article: Isotopes of rhodium
| iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
| 99Rh |
syn |
16.1 d |
ε |
- |
99Ru |
| γ |
0.089, 0.353,
0.528 |
- |
| 101mRh |
syn |
4.34 d |
ε |
- |
101Ru |
| IT |
0.157 |
101Rh |
| γ |
0.306, 0.545 |
- |
| 101Rh |
syn |
3.3 y |
ε |
- |
101Ru |
| γ |
0.127, 0.198,
0.325 |
- |
| 102mRh |
syn |
2.9 y |
ε |
- |
102Ru |
| γ |
0.475, 0.631,
0.697, 1.046 |
- |
| 102Rh |
syn |
207 d |
ε |
- |
102Ru |
| β+ |
0.826, 1.301 |
102Ru |
| β- |
1.151 |
102Pd |
| γ |
0.475, 0.628 |
- |
| 103Rh |
100% |
Rh is stable with 58 neutrons |
| 105Rh |
syn |
35.36 h |
β- |
0.247, 0.260,
0.566 |
105Pd |
| γ |
0.306, 0.318 |
- |
|
| References |
|
Rhodium Compounds
|
Source: Wikipedia article Rhodium
|
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Chemistry Quick Facts
