Sesium |
| Simbool | Cs |
|---|---|
| Latyn naam | Caesium |
| Atomiese nommer | 55 |
| Periode | 6 |
| Element kategorie | Alkalie metale |
| Relatieve atomiese massa | 132.90543 |
| Groep | I.A |
| Electronegativiteit | 0.7 |
| Oksidering nommers | 1 |
| Elektronkonfigurasie | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s1 |
| Digtheid [g/cm3] | 1.873 |
| Staat | Vaste stof |
| Smeltpunt [°C] | 28.40 |
| Kookpunt [°C] | 700 |
| Kritiese Punt [°C] | 1665 |
| Kritiese druk [MPa] | 9.4 |
| Atomiese radius [pm] | 298 |
| Covalent radius [pm] | 225 |
| Warmte geleiding [W m-1K-1] | 35.9 |
| Warmtekapasiteit [J K-1g-1] | 0.24 |
| Ontdekking | 1860 |
| Hardheid [Mohs skaal] | 0.2 |
| Young's modulus [GPa] | 1.7 |
| Elektriese geleiding [S m-1] | 5.3 · 106 |
| 1.ste ionisasie-energie [eV] | 3.8939 |
| 2.de ionisasie-energie [eV] | 25.10 |
| Stabiele isotope | 2 |
| Onstabiele isotope | 19 |