| Lanthanum |
|
57La
|
|
|
| Ìhànsójú |
silvery white
 |
| Àwọn ìdámọ́ wíwọ́pọ̀ |
| Orúkọ, àmì-ìdámọ́, nọ́mbà |
lanthanum, La, 57 |
| Ẹ̀ka ẹ́límẹ̀nti |
lanthanide |
| Ẹgbẹ́, àsìkò, àdìpò |
n/a, 6, f |
| Ìwúwo átọ́mù |
138.90547 |
| Ìtòléra ẹ̀lẹ́ktrónì |
[Xe] 5d1 6s2
2, 8, 18, 18, 9, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
6.162 g·cm−3 |
| Liquid density at m.p. |
5.94 g·cm−3 |
| Melting point |
1193 K, 920 °C, 1688 °F |
| Boiling point |
3737 K, 3464 °C, 6267 °F |
| Heat of fusion |
6.20 kJ·mol−1 |
| Heat of vaporization |
402.1 kJ·mol−1 |
| Molar heat capacity |
27.11 J·mol−1·K−1 |
| Vapor pressure (extrapolated) |
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
2005 |
2208 |
2458 |
2772 |
3178 |
3726 |
|
| Atomic properties |
| Oxidation states |
3, 2 (strongly basic oxide) |
| Electronegativity |
1.10 (Pauling scale) |
| Ionization energies |
1st: 538.1 kJ·mol−1 |
| 2nd: 1067 kJ·mol−1 |
| 3rd: 1850.3 kJ·mol−1 |
| Atomic radius |
187 pm |
| Covalent radius |
207±8 pm |
| Miscellanea |
| Crystal structure |
hexagonal
|
| Magnetic ordering |
paramagnetic[1] |
| Electrical resistivity |
(r.t.) (α, poly) 615 nΩ·m |
| Thermal conductivity |
13.4 W·m−1·K−1 |
| Thermal expansion |
(r.t.) (α, poly) 12.1 µm/(m·K) |
| Speed of sound (thin rod) |
(20 °C) 2475 m·s−1 |
| 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 registry number |
7439-91-0 |
| Àwọn ísótòpù dídúró jùlọ |
| Main article: Àwọn ísótòpù lanthanum |
|
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|
· r |
Lanthanum (pípè /ˈlænθənəm/) je apilese kemika to ni ami-idamo La ati nomba atomu 57.
