Group 9 element
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(Redirected from Cobalt family)
| Group → | 9 |
|---|---|
| ↓ Period | |
| 4 | 27 Co |
| 5 | 45 Rh |
| 6 | 77 Ir |
| 7 | 109 Mt |
In modern IUPAC nomenclature, Group 9 of the periodic table contains the elements cobalt (Co), rhodium (Rh), iridium (Ir), and meitnerium (Mt). These are all d-block transition metals. All known isotopes of Mt are radioactive with short half-lives, and it is not known to occur in nature; only minute quantities have been synthesized in laboratories.
Like other groups, the members of this family show patterns in its electron configuration, especially the outermost shells resulting in trends in chemical behavior, though rhodium curiously does not follow the pattern:
| 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 |
[edit] Applications
- Alloys with other metals, primarially to add corrosion and wear resistance
- Industrial Catalysts
- Superalloys
- Electrical Components
[edit] See also
| Explanation of right side periodic table slice: | Transition metals | atomic number in black are solids | solid borders are older than the Earth (Primordial elements) | dashed borders have no isotopes older than the earth |
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