| From Wikipedia, the free encyclopediaRhodium is a chemical element with symbol Rh and atomic number 45. It is a rare, silvery-white, hard, and chemically inert transition metal. It is a member of the platinum group. | |||||||
Rhodium in the periodic table | |||||||
|---|---|---|---|---|---|---|---|
| Symbol | Rh | ||||||
| Atomic number | 45 | ||||||
| Group | 9 | ||||||
| Period | 5 | ||||||
| Block | d | ||||||
| Element category | Transition Metal | ||||||
Physical properties | |||||||
| Phase at STP | Solid | ||||||
| Density | 12.41 g/cm3 | ||||||
| Atomic weight | 102.906 u | ||||||
| Melting point | 2237 K 1963.85 °C 3566.93 °F | ||||||
| Boiling point | 3968 K 3694.85 °C 6682.73 °F | ||||||
Atomic properties | |||||||
| Electronegativity (Pauling Scale) | 2.28 | ||||||
| Electron affinity | 110.27 kJ/mol | ||||||
| Oxidation states | −3, −1, 0, +1, +2, +3, +4, +5, +6 (an amphoteric oxide) | ||||||
| Ionization energies |
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Electron configuration | |||||||
| Elektronkonfiguration (shorthand) | [Kr] 4d8 5s1 | ||||||
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d8 5s1 | ||||||
| Electrons per shell | 2, 8, 18, 16, 1 | ||||||
History | |||||||
| Discovered | 1804 | ||||||
| Discovered by | William Hyde Wollaston | ||||||