Rubidium
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| Rubidium |
|
37Rb
|
|
|
| Ìhànsójú |
grey white
 |
| Àwọn ìdámọ́ wíwọ́pọ̀ |
| Orúkọ, àmì-ìdámọ́, nọ́mbà |
rubidium, Rb, 37 |
| Ìpèlóhùn |
/rʉˈbɪdiəm/ roo-BID-ee-əm |
| Ẹ̀ka ẹ́límẹ̀nti |
alkali metal |
| Ẹgbẹ́, àsìkò, àdìpò |
1, 5, s |
| Ìwúwo átọ́mù |
85.4678(3) |
| Ìtòléra ẹ̀lẹ́ktrónì |
[Kr] 5s1
2, 8, 18, 8, 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 |
| Molar heat capacity |
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 |
| Oxidation states |
1
(strongly basic oxide) |
| Electronegativity |
0.82 (Pauling scale) |
| Ionization energies |
1st: 403 kJ·mol−1 |
| 2nd: 2632.1 kJ·mol−1 |
| 3rd: 3859.4 kJ·mol−1 |
| Atomic radius |
248 pm |
| Covalent radius |
220±9 pm |
| Van der Waals radius |
303 pm |
| Miscellanea |
| Crystal structure |
body-centered cubic
|
| Magnetic ordering |
paramagnetic[1] |
| Electrical resistivity |
(20 °C) 128 nΩ·m |
| Thermal conductivity |
58.2 W·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 1300 m·s−1 |
| 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 |
| Àwọn ísótòpù dídúró jùlọ |
| Main article: Àwọn ísótòpù rubidium |
|
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· r |
