Characteristics
| Z | Element | No. of electrons/shell |
|---|---|---|
| 27 | cobalt | 2, 8, 15, 2 |
| 45 | rhodium | 2, 8, 18, 16, 1 |
| 77 | iridium | 2, 8, 18, 32, 15, 2 |
| 109 | meitnerium | 2, 8, 18, 32, 32, 15, 2 |
Rhodium is a hard, silvery, durable metal that has a high reflectance. Rhodium metal does not normally form an oxide, even when heated. Oxygen is absorbed from the atmosphere only at the melting point of rhodium, but is released on solidification. Rhodium has both a higher melting point and lower density than platinum. It is not attacked by most acids: it is completely insoluble in nitric acid and dissolves slightly in aqua regia.
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