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45
Rh
102.9055
Rhodium |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| Name: Rhodium | Symbol: Rh |
| Group: Trans. Met. | Atomic weight: 102.9055 |
| Density @ 293 K: 12.4 g/cm3 | Atomic volume: 8.3 cm3/mol |
| Group: Trans. Met. | Discovered: 1803 |
States
| State (s, l, g): solid | |
| Melting point: 2238.2 K | Boiling point: 4033 K |
| Heat of fusion: 21.50 kJ/mol | Heat of vaporization: 493.0 kJ/mol |
Energies
| 1st ionization energy: 719.8 kJ/mole | |
| Electronegativity: 2.28 | 2nd ionization energy: 1744.4 kJ/mole |
| Electron affinity: 109.7 kJ/mole | 3rd ionization energy: 2996.8 kJ/mole |
| Specific heat: 0.242 J/gK | Heat atomization: 556 kJ/mole atoms |
Oxidation & Electrons
| Shells: 2,8,18,16,1 | Electron configuration: [Kr] 4d8 5s1 |
| Minimum oxidation number: -1 | Maximum oxidation number: 6 |
| Min. common oxidation no.: 0 | Max. common oxidation no.: 3 |
Appearance & Characteristics
| Structure: fcc: face-centered cubic | Color: silvery-white |
| Uses: catalysts, elec. contacts | Toxicity: |
| Hardness: mohs | Characteristics: forms hard coatings |
Reactions
| Reaction with air: none, w/ht => Rh2O3 | |
| Reaction with 6 M HCl: none | Reaction with 6 M HCl: none |
| Reaction with 15 M HNO3: none | Reaction with 6 M NaOH: none |
Other Forms
| Number of isotopes: 1 | Hydride(s): none |
| Oxide(s): Rh2O3 RhO2 | Chloride(s): RhCl3 |
Radius
| Ionic radius (2- ion): pm | Ionic radius (1- ion): pm |
| Atomic radius: 134 pm | Ionic radius (1+ ion): pm |
| Ionic radius (2+ ion): pm | Ionic radius (3+ ion): 80.5 pm |
Conductivity
| Thermal conductivity: 150 J/m-sec-deg | |
| Electrical conductivity: 221.729 1/mohm-cm | Polarizability: 8.6 A^3 |
Abundance
| Source: nickel ores (sulfides) | |
| Rel. abund. solar system: -0.463 log | Abundance earth's crust: -3 log |
| cost, pure: 13000 $/100g | cost, bulk: $/100g |
