Rubidium
Lát'ọwọ́ Wikipedia, ìwé ìmọ̀ ọ̀fẹ́
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| Ìfarahàn |
grey white
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| Àwọn ìní àníkárí |
| Orúkọ, àmì-ìdámọ̀, nọ́mbà |
rubidium, Rb, 37 |
| Ìpè |
/rʉˈbɪdiəm/ roo-BID-ee-əm |
| Ẹ̀ka apilẹ̀sẹ̀ |
alkali metal |
| Àdìpọ̀, ìgbà, block |
1, 5, s |
| Ìwúwo átọ́mù |
85.4678(3) g·mol−1 |
| Ìtòjọ ẹ̀lẹ́ktrónì |
[Kr] 5s1 |
| Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan |
2, 8, 18, 8, 1 (Image) |
| Àwọn ìní aláfójúrí |
| Phase |
solid |
| Kíki (tó súnmọ́ r.t.) |
1.532 g·cm−3 |
| Liquid density at m.p. |
1.46 g·cm−3 |
| ojúàmì ìyọ́ |
312.46 K, 39.31 °C, 102.76 °F |
| ajúàmì ìhó |
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 |
| Specific 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 |
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| 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 |
(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 |
| Most stable isotopes |
| Main article: Isotopes of rubidium |
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