Group 9 elements
Group 9 of the periodic table contains these elements: Cobalt, Rhodium, Iridium, Meitnerium.
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| No. | Symbol | Element | Atomic weight (u) | Density (g/cm³) | Melting point (K) | Boiling point (K) | Electronegativity | Discovered |
|---|---|---|---|---|---|---|---|---|
| 27 | Co | Cobalt | 58.9332 | 8.9 | 1768 | 3200 | 1.88 | 1735 |
| 45 | Rh | Rhodium | 102.906 | 12.41 | 2237 | 3968 | 2.28 | 1804 |
| 77 | Ir | Iridium | 192.217 | 22.56 | 2719 | 4403 | 2.2 | 1803 |
| 109 | Mt | Meitnerium | 277.154 | 37.4 | - | - | - | 1982 |