Cesium
| Basic Information | Crystal Structure | Isotope | Facts | Related Links |
| Symbol: | Cs |
| Atomic Number: | 55 |
| Atomic weight: | 132.9054u |
| Melting Point: | 301.55K |
| Boiling Point: | 944K |
| Number of Protons/Electrons: | 55 |
| Number of Neutrons: | 78 |
| Classification: | Alkali Metal |
| Crystal Structure: | Body Centered Cubic |
| Density at 293 K: | 1.87g/mL |
| Color: | Silver |
| Bonding radius: | 2.35A |
| Atomic radius: | 3.34A |
| Ionization Potential: | 3.894V |
| Electronegativity: | 0.79 |
| Heat of vaporization: | 67.74kJ/mol |
| Heat of fusion: | 2.092kJ/mol |
| Specific heat: | 0.24J/gK |
| Electron configuration: | [Xe]6s1 |
Crystal Structure
|
Isotope |
Half Life |
| Cs126 | 1.6 minutes |
| Cs129 | 1.3 days |
| Cs131 | 9.7 days |
| Cs132 | 6.4 days |
| Cs133 | Stable |
| Cs134 | 2.1 years |
| Cs134m | 2.9 hours |
| Cs135 | 2300000 years |
| Cs136 | 13.2 days |
| Cs137 | 30.2 years |
| Cs138 | 32.2 minutes |
| Cs139 | 9.3 minutes |
| Date of Discovery: | 1860 |
| Discoverer: | Fustov Kirchoff |
| Uses: | Removes air traces in vacuum tubes |
| Obtained From: | Pollucite, lepidolite |