Lanthanum

Lanthanum, ₅₇La
Lanthanum
Pípè	/ˈlænθənəm/ (LAN-thə-nəm)
Ìhànsójú	silvery white
Ìwúwo átọ̀mù Ar, std(La)	138.90547(7)
Lanthanum ní orí tábìlì àyè
	barium ← lanthanum → cerium
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)
Atomic properties
Oxidation states	0, +1, +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
	Spectral lines of lanthanum
Other 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
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; wo; ọ̀rọ̀; àtúnṣe; \| references

Lanthanum (pípè /ˈlænθənəm/) je apilese kemika to ni ami-idamo La ati nomba atomu 57.

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Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

↑ 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. CRC press. 2000. ISBN 0849304814. http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf.