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Lanthanum |
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Pípè | /ˈlænθənəm/ (LAN-thə-nəm) |
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Ìhànsójú | silvery white |
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Ìwúwo átọ̀mù Ar, std(La) | 138.90547(7)[1] |
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Lanthanum ní orí tábìlì àyè |
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|
Nọ́mbà átọ̀mù (Z) | 57 |
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Ẹgbẹ́ | group 3 |
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Àyè | àyè 6 |
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Àdìpọ̀ | Àdìpọ̀-f |
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Ẹ̀ka ẹ́límẹ́ntì | Lanthanide |
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Ìtò ẹ̀lẹ́ktrọ́nù | [Xe] 5d1 6s2 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 18, 9, 2 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | 1193 K (920 °C, 1688 °F) |
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Ígbà ìhó | 3737 K (3464 °C, 6267 °F) |
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Kíki (near r.t.) | 6.162 g/cm3 |
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when liquid (at m.p.) | 5.94 g/cm3 |
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Heat of fusion | 6.20 kJ/mol |
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Heat of | 402.1 kJ/mol |
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Molar heat capacity | 27.11 J/(mol·K) |
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pressure (extrapolated)
P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
---|
at T (K)
|
2005
|
2208
|
2458
|
2772
|
3178
|
3726
|
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|
Atomic properties |
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Oxidation states | 0,[2] +1, +2, +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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Electronegativity | Pauling scale: 1.10 |
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Atomic radius | empirical: 187 pm |
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Covalent radius | 207±8 pm |
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Spectral lines of lanthanum |
Other properties |
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Natural occurrence | primordial |
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Crystal structure | hexagonal |
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Speed of sound thin rod | 2475 m/s (at 20 °C) |
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Thermal expansion | (r.t.) (α, poly) 12.1 µm/(m·K) |
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Thermal conductivity | 13.4 W/(m·K) |
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Electrical resistivity | (r.t.) (α, poly) 615 n Ω·m |
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Magnetic ordering | paramagnetic[3] |
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Young's modulus | (α form) 36.6 GPa |
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Shear modulus | (α form) 14.3 GPa |
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Bulk modulus | (α form) 27.9 GPa |
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Poisson ratio | (α form) 0.280 |
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Mohs hardness | 2.5 |
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Vickers hardness | 491 MPa |
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Brinell hardness | 363 MPa |
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CAS Number | 7439-91-0 |
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Main isotopes of lanthanum |
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Àdàkọ:Category-inline | references |