Rubidium |
| Simbool | Rb |
|---|---|
| Latynse naam | Rubidium |
| Atoomgetal | 37 |
| Periode | 5 |
| Element kategorie | Alkalie metale |
| Relatieve atomiese massa | 85.4678 |
| Groep | I.A |
| Electronegativiteit | 0.8 |
| Oksidering nommers | 1 |
| Elektronkonfigurasie | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1 |
| Digtheid [g/cm3] | 1.532 |
| Staat | Vaste stof |
| Smeltpunt [°C] | 38.89 |
| Kookpunt [°C] | 688 |
| Kritiese Punt [°C] | 1820 |
| Kritiese druk [MPa] | 16 |
| Atoomradius [pm] | 265 |
| Covalent radius [pm] | 211 |
| Termiese geleidingsvermoë [W m-1K-1] | 58.2 |
| Hitte kapasiteit [J K-1g-1] | 0.363 |
| Ontdekking | 1861 |
| Hardheid [Mohs-skaal] | 0.3 |
| Brinell-hardheid [MPa] | 0.216 |
| Young's modulus [GPa] | 2.4 |
| Elektriese geleiding [S m-1] | 4.78 · 107 |
| 1ste ionisasie-energie [eV] | 4.1771 |
| 2de ionisasie-energie [eV] | 27.28 |
| 3de ionisasie-energie [eV] | 40.0 |
| Stabiele isotope | 2 |
| Onstabiele isotope | 19 |