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|
Rubidium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Rb | 37 | 85.4678 | 39.31 °C | 688 °C | Solid | 1.532 g/cm3 | Alkali Metal |
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|
|
| General |
| Name, Symbol, Number |
rubidium, Rb, 37 |
| Chemical series |
alkali metals |
| Group, Period, Block |
1, 5, s |
| Appearance |
grey white
 |
| Standard atomic weight |
85.4678(3) g·mol−1 |
| Electron configuration |
[Kr] 5s1 |
| Electrons per shell |
2, 8, 8, 18, 1 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
1.532 g·cm−3 |
| Liquid density at m.p. |
1.46 g·cm−3 |
| Melting point |
312.46 K
(39.31 °C, 102.76 °F) |
| Boiling point |
961 K
(688 °C, 1270 °F) |
| Critical point |
(extrapolated)
2093 K, 16 MPa |
| Heat of fusion |
2.19 kJ·mol−1 |
| Heat of vaporization |
75.77 kJ·mol−1 |
| Heat capacity |
(25 °C) 31.060 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
434 |
486 |
552 |
641 |
769 |
958 |
|
| Atomic properties |
| Crystal structure |
cubic body centered |
| Oxidation states |
1
(strongly basic oxide) |
| Electronegativity |
0.82 (scale Pauling) |
Ionization energies
(more) |
1st: 403.0 kJ·mol−1 |
| 2nd: 2633 kJ·mol−1 |
| 3rd: 3860 kJ·mol−1 |
| Atomic radius |
235 pm |
| Atomic radius (calc.) |
265 pm |
| Covalent radius |
211 pm |
| Van der Waals radius |
244 pm |
| Miscellaneous |
| Magnetic ordering |
no data |
| Electrical resistivity |
(20 °C) 128 n Ω·m |
| Thermal conductivity |
(300 K) 58.2 W·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 1300 m/s |
| Young's modulus |
2.4 GPa |
| Bulk modulus |
2.5 GPa |
| Mohs hardness |
0.3 |
| Brinell hardness |
0.216 MPa |
| CAS registry number |
7440-17-7 |
| Selected isotopes |
|
|
| References |
|
Rubidium Compounds
|
Source: Wikipedia article Rubidium
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Chemistry Quick Facts
