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) [ 1] Rubidium ní orí tábìlì àyè
Nọ́mbà átọ̀mù (Z ) 37 Ẹgbẹ́ group 1 : H and alkali metalsÀyè 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 rubidiumOther 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 [ 2] 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
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