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Cesium (Caesium)
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Cs | 55 | 132.9054519 | 28.44 °C | 671 °C | Solid | 1.93 g/cm3 | Alkali Metal |
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| General |
| Name, Symbol, Number |
caesium, Cs, 55 |
| Chemical series |
alkali metals |
| Group, Period, Block |
1, 6, s |
| Appearance |
silvery gold
 |
| Standard atomic weight |
132.9054519(2) g·mol−1 |
| Electron configuration |
[Xe] 6s1 |
| Electrons per shell |
2, 8, 18, 18, 8, 1 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
1.93 g·cm−3 |
| Liquid density at m.p. |
1.843 g·cm−3 |
| Melting point |
301.59 K
(28.44 °C, 83.19 °F) |
| Boiling point |
944 K
(671 °C, 1240 °F) |
| Critical point |
1938 K, 9.4 MPa |
| Heat of fusion |
2.09 kJ·mol−1 |
| Heat of vaporization |
63.9 kJ·mol−1 |
| Heat capacity |
(25 °C) 32.210 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
418 |
469 |
534 |
623 |
750 |
940 |
|
| Atomic properties |
| Crystal structure |
body centered cubic |
| Oxidation states |
1
(strongly basic oxide) |
| Electronegativity |
0.79 (scale Pauling) |
| Ionization energies |
1st: 375.7 kJ/mol |
| 2nd: 2234.3 kJ/mol |
| 3rd: 3400 kJ/mol |
| Atomic radius |
260 pm |
| Atomic radius (calc.) |
298 pm |
| Covalent radius |
225 pm |
| Miscellaneous |
| Magnetic ordering |
no data |
| Electrical resistivity |
(20 °C) 205 n Ω·m |
| Thermal conductivity |
(300 K) 35.9 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 97 µm·m−1·K−1 |
| Young's modulus |
1.7 GPa |
| Bulk modulus |
1.6 GPa |
| Mohs hardness |
0.2 |
| Brinell hardness |
0.14 MPa |
| CAS registry number |
7440-46-2 |
| Selected isotopes |
|
|
| References |
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Cesium Compounds
|
Source: Wikipedia article Cesium
|
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Chemistry Quick Facts
