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Lanthanum, 57 Lanthanum Pípè / ˈ l æ n θ ə n ə m / (LAN -thə-nəm Ìhànsójú silvery white Ìwúwo átọ̀mù A r, std (La) 138.9054 7(7) [ 1] Lanthanum ní orí tábìlì àyè
Nọ́mbà átọ̀mù (Z ) 57 Ẹgbẹ́ group 3 Àyè àyè 6 Àdìpọ̀ Àdìpọ̀-f Ẹ̀ka ẹ́límẹ́ntì Lanthanide Ìtò ẹ̀lẹ́ktrọ́nù [Xe ] 5d1 6s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 18, 9, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 1193 K (920 °C, 1688 °F) Ígbà ìhó 3737 K (3464 °C, 6267 °F) Kíki (near r.t. ) 6.162 g/cm3 when liquid (at m.p. ) 5.94 g/cm3 Heat of fusion 6.20 kJ/mol Heat of 402.1 kJ/mol Molar heat capacity 27.11 J/(mol·K) pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
2005
2208
2458
2772
3178
3726
Atomic properties Oxidation states 0,[ 2] +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 1.10 Atomic radius empirical: 187 pm Covalent radius 207±8 pm Color lines in a spectral range Spectral lines of lanthanumOther properties Natural occurrence primordial Crystal structure hexagonal Speed of sound thin rod 2475 m/s (at 20 °C) Thermal expansion (r.t. ) (α, poly) 12.1 µm/(m·K) Thermal conductivity 13.4 W/(m·K) Electrical resistivity (r.t. ) (α, poly) 615 n Ω·m Magnetic ordering paramagnetic [ 3] Young's modulus (α form) 36.6 GPa Shear modulus (α form) 14.3 GPa Bulk modulus (α form) 27.9 GPa Poisson ratio (α form) 0.280 Mohs hardness 2.5 Vickers hardness 491 MPa Brinell hardness 363 MPa CAS Number 7439-91-0 Main isotopes of lanthanum
Àdàkọ:Category-inline references
Lanthanum (pípè /ˈlænθənəm/ apilese kemika to ni ami-idamo La ati nomba atomu 57.
↑ 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 . ↑ Yttrium and all lanthanides except Ce, Pm, Eu, Tm, Yb have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, see Cloke, F. Geoffrey N. (1993). "Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides". Chem. Soc. Rev. 22 : 17–24. doi :10.1039/CS9932200017 .
↑ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics ISBN 0849304814 . http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf .
