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Caesium, 55 Cs Caesium Pípè / ˈ s iː z i ə m / (SEE -zee-əm ) Ìhànsójú silvery gold Ìwúwo átọ̀mù A r, std (Cs) 132.9054 519 6(6) [1] Caesium ní orí tábìlì àyè
Nọ́mbà átọ̀mù (Z ) 55 Ẹgbẹ́ group 1 : H and alkali metalsÀyè àyè 6 Àdìpọ̀ Àdìpọ̀-s Ẹ̀ka ẹ́límẹ́ntì Alkali metal Ìtò ẹ̀lẹ́ktrọ́nù [Xe ] 6s1 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 18, 8, 1 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 301.59 K (28.44 °C, 83.19 °F) Ígbà ìhó 944 K (671 °C, 1240 °F) Kíki (near r.t. ) 1.93 g/cm3 when liquid (at m.p. ) 1.843 g/cm3 Critical point 1938 K, 9.4 MPa Heat of fusion 2.09 kJ/mol Heat of 63.9 kJ/mol Molar heat capacity 32.210 J/(mol·K) pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
418
469
534
623
750
940
Atomic properties Oxidation states −1, +1 [2] Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 0.79 Atomic radius empirical: 265 pm Covalent radius 244±11 pm Van der Waals radius 343 pm Color lines in a spectral range Spectral lines of caesiumOther properties Natural occurrence primordial Crystal structure (bcc) Thermal expansion 97 µm/(m·K) (at 25 °C) Thermal conductivity 35.9 W/(m·K) Electrical resistivity 205 Ω·m (at 20 °C) Magnetic ordering paramagnetic [3] Young's modulus 1.7 GPa Bulk modulus 1.6 GPa Mohs hardness 0.2 Brinell hardness 0.14 MPa CAS Number 7440-46-2 Main isotopes of caesium
Àdàkọ:Category-inline | references
Kesium tabi kaesium je apilese kemika pelu ami-idamo Cs ati nomba atomu 55.
Itokasi
↑ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry 88 (3): 265–91. doi :10.1515/pac-2015-0305 .
↑ Dye, J. L. (1979). "Compounds of Alkali Metal Anions". Angewandte Chemie International Edition 18 (8): 587–598. doi :10.1002/anie.197905871 .
↑ Magnetic susceptibility of the elements and inorganic compounds , in Handbook of Chemistry and Physics 81st edition, CRC press.