PERIODIC ELEMENT
Cs (Cesium)
Atomic number | : | 55 |
Atomic mass | : | 132.9054 g.mol-1 |
Electronegativity according to Pauling | : | 0.7 |
Density | : | 1.9 g.cm-3 at 20 °C |
Melting point | : | 28.4 °C |
Boiling point | : | 669 °C |
Vanderwaals radius | : | 0.267 nm |
Ionic radius | : | 0.167 nm |
Isotopes | : | 12 |
Electronic shell | : | [Xe] 6s1 |
Energy of first ionisation | : | 375.6 kJ.mol-1 |
Discovered by | : | Fustov Kirchhoff in 1860 |
Atomic Structure | Uses (removes air traces in vacuum tubes) | |