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General information about Rhodium |
| Rhodium |
| Rh |
| 45 |
| Transition Metals |
| 9 |
| 5 |
| d |
| silvery white metallic |
| 102.90550 g·mol-1 |
1s2 2s2p6 3s2p6d10
4s2p6d8 5s1 |
| 2, 8, 18, 16, 1 |
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Physical properties of Rhodium |
| solid |
| 12.41 g·cm-3 |
| 2237(K),
1964°C, 3567°F |
| 3968(K),
3695°C, 6683°F |
| ? |
| ? |
| 26.59 kJ·mol-1 |
| 494 kJ·mol-1 |
| 24.98 J·mol-1·K-1 |
| 2.28 (Pauling scale) |
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Atomic structure of Rhodium |
| 1.83 Å |
| 8.3 cm³/mol |
| 1.25 Å |
| 144.8 |
| Cubic face centered |
| 68 (+3e) |
| 4d8 |
| 45 |
| 58 |
| 45 |
| 2, 3, 4 |
| 4d8 5s1 |
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Electron dot
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Other languages |
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| Latin: |
Rhodium |
| Czech: |
Rhodium |
| Croatian: |
Rodij |
| French: |
Rhodium |
| German: |
Rhodium - s |
| Italian: |
Rodio |
| Norwegian: |
Rhodium |
| Portuguese: |
Ródio |
| Spanish: |
Rodio |
| Swedish: |
Rodium |
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| Element |
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45 |
2
8
18
16
1
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Rh |
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102.90550 |
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Brief description |
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Rhodium metal is silvery-white. When exposed to red heat, the metal slowly changes in air to the sesquioxide. At higher temperatures it converts back to its elemental form. Rhodium has a higher melting point and lower density than platinum. The melting point of rhodium is 1966 +/-3°C, boiling point 3727 +/-100°C, specific gravity 12.41 (20°C), with a valence of 2, 3, 4, 5, and 6.
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Uses of Rhodium |
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One major use of rhodium is as an alloying agent to harden platinum and palladium. Because it has a low electrical resistance, rhodium is useful as an electrical contact material. Rhodium has a low and stable contact resistance and is highly resistant to corrosion. Plated rhodium is very hard and has a high reflectance, which makes it useful for optical instruments and jewelry. Rhodium is also used as a catalyst in certain reactions.
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Hystory of Rhodium |
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- Discoverer: William H. Wollaston
- Discovery Location: London
- Discovery Year: 1803
- Name Origin: Greek: rhodon - rose.
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