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