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| Rubidium |
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| Pípè | /ruːˈbɪdiəm/ (roo-BID-ee-əm) |
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| Ìhànsójú | grey white |
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| Ìwúwo átọ̀mù Ar, std(Rb) | 85.4678(3)[1] |
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| Rubidium ní orí tábìlì àyè |
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| Nọ́mbà átọ̀mù (Z) | 37 |
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| Ẹgbẹ́ | group 1: H and alkali metals |
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| Àyè | àyè 5 |
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| Àdìpọ̀ | Àdìpọ̀-s |
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| Ẹ̀ka ẹ́límẹ́ntì | Alkali metal |
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| Ìtò ẹ̀lẹ́ktrọ́nù | [Kr] 5s1 |
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| Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 8, 1 |
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| Àwọn ohun ìní ara |
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| Ìfarahàn at STP | solid |
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| Ìgbà ìyọ́ | 312.46 K (39.31 °C, 102.76 °F) |
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| Ígbà ìhó | 961 K (688 °C, 1270 °F) |
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| Kíki (near r.t.) | 1.532 g/cm3 |
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| when liquid (at m.p.) | 1.46 g/cm3 |
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| Critical point | (extrapolated) 2093 K, 16 MPa |
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| Heat of fusion | 2.19 kJ/mol |
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| Heat of | 75.77 kJ/mol |
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| Molar heat capacity | 31.060 J/(mol·K) |
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pressure| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
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| at T (K) | 434 | 486 | 552 | 641 | 769 | 958 |
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| Atomic properties |
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| Oxidation states | −1, +1 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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| Electronegativity | Pauling scale: 0.82 |
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| Atomic radius | empirical: 248 pm |
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| Covalent radius | 220±9 pm |
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| Van der Waals radius | 303 pm |
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 Color lines in a spectral rangeSpectral lines of rubidium |
| Other properties |
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| Natural occurrence | primordial |
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| Crystal structure | (bcc) |
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| Speed of sound thin rod | 1300 m/s (at 20 °C) |
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| Thermal conductivity | 58.2 W/(m·K) |
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| Electrical resistivity | 128 n Ω·m (at 20 °C) |
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| Magnetic ordering | paramagnetic[2] |
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| Young's modulus | 2.4 GPa |
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| Bulk modulus | 2.5 GPa |
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| Mohs hardness | 0.3 |
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| Brinell hardness | 0.216 MPa |
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| CAS Number | 7440-17-7 |
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| Main isotopes of rubidium |
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| Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
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| 83Rb | syn | 86.2 d | ε | - | 83Kr | | γ | 0.52, 0.53,
0.55 | - | | 84Rb | syn | 32.9 d | ε | - | 84Kr | | β+ | 1.66, 0.78 | 84Kr | | γ | 0.881 | - | | β− | 0.892 | 84Sr | | 85Rb | 72.168% | 85Rb is stable with 48 neutrons | | 86Rb | syn | 18.65 d | β− | 1.775 | 86Sr | | γ | 1.0767 | - | | 87Rb | 27.835% | 4.88 × 1010 y | β− | 0.283 | 87Sr |
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Àdàkọ:Category-inline
| references |
