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General information about Caesium |
| caesium |
| Cs |
| 55 |
| alkani metals |
| 1 |
| 6 |
| s |
| silvery gold |
| 132.9054519(2) g·mol-1 |
1s2 2s2p6 3s2p6d10
4s2p6d10 5s2p6 6s1 |
| 2, 8, 18, 18, 8, 1 |
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Physical properties of Caesium |
| solid |
| ? |
| 301.59(K), 28.44°C, 83.19°F |
| 944(K), 671°C, 1240°F |
| ? |
| 1938(K), 9.4 MPa |
| 2.09 kJ·mol-1 |
| 63.9 kJ·mol-1 |
| 32.210 J·mol-1·K-1 |
| 0.79 (Pauling scale) |
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Atomic structure of Caesium |
| 2.23 Å |
| 23.7 cm³/mol |
| 1.54 Å |
| 0.53 |
| Cubic body centered |
| 167 (+1e) |
| 3s¹ |
| 11 |
| 12 |
| 11 |
| 1 |
| 3s¹ |
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Electron dot
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Other languages |
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| Latin: |
Caesium |
| Czech: |
Cesium |
| Croatian: |
Cezij |
| French: |
Césium |
| German: |
Zäsium - s |
| Italian: |
Cesio |
| Norwegian: |
Cesium |
| Portuguese: |
Césio |
| Spanish: |
Cesio |
| Swedish: |
Cesium |
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| Element |
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55 |
2
8
18
18
8
1
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Cs |
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132.9054 |
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Brief description |
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Found in pollucite and as trace in lepidolite. World production is around 20 tons per year. Primary mining areas are in Bernic Lake (Manitoba, Canada), Bikita (Zimbabwe) and South-West Africa.
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Uses of Caesium |
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Used as a 'getter' to remove air traces in vacuum tubes. Since it ionizes readily, it is used as an ion rocket motor propellant. Also used in photoelectric cells, atomic clocks, infared lamps.
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Hystory of Caesium |
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- Discoverer: Gustov Kirchoff, Robert Bunsen
- Discovery Location: Germany
- Discovery Year: 1860
- Name Origin: Latin: coesius (sky blue); named for the blue lines of its spectrum
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