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Metals, Building materials, Chemistry, Oil, Minerals... |
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Resources: Periodic table |
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Atomic symbol: La |
Atomic number: 57 |
Atomic weight: 138.9055 |
Atomic volume: 20.73 cm3/mol |
Density: 6.7 g/cm3 |
Period Number: 6 |
Group number: none |
Group name: Trans. Met. |
Element classification: Metal |
Phase at room temperature: Solid |
Melting Point: 1193.2 K |
Boiling point: 3693 K |
Heat of fusion: 6.20 kJ/mol |
Heat of vaporization: 414.0 kJ/mol |
Ionization Energy: 5.577 eV |
1st ionization energy: 538.1 kJ/mole |
2nd ionization energy: 1067 kJ/mole |
3rd ionization energy: 1850 kJ/mole |
Electronegativity: 1.1 |
Electron affinity: 50 kJ/mole |
Specific heat: 0.19 J/gK |
Heat atomization: 423 kJ/mole atoms |
Shells: 2,8,18,18,9,2 |
Electron Shell Configuration: [Xe] 5d1 6s2 |
Minimum oxidation number: 0 |
Maximum oxidation number: 3 |
Minimum common oxidation number: 0 |
Maximum common oxidation no: 3 |
Appearance & Characteristics |
Structure:: cp: close packed (ABCB) |
Color: silvery-white |
Hardness: mohs |
Toxicity: ? |
Characteristics: soft, malleable |
Uses: lighter flints, CRTs |
Reaction with air: vigorous, w/ht =>La2O3 |
Reaction with 6M HCl: mild, =>H2, LaCl3 |
Reaction with 15M HNO3: mild, =>La(NO3)3 |
Reaction with 6M NaOH: ? |
Number of isotopes: 2 |
Oxide(s): La2O3 |
Hydride(s): LaH2 LaH3 |
Chloride(s): LaCl3 |
Atomic Radius: 187 pm |
Ionic radius (1- ion): pm |
Ionic radius (1+ ion): pm |
Ionic radius (2- ion): pm |
Ionic radius (2+ ion): pm |
Ionic radius (3+ ion): 117.2 pm |
Thermal conductivity: 13.4 J/m-sec-deg |
Electrical conductivity: 14.2 1/mohm-cm |
Polarizability: 31.1 A^3 |
Source: Monazite(phosphate),bastnaesite |
Relative abundance solar system: -0.351 log |
Abundance earth's crust: 1.5 log |
Estimated crustal abundance: 3.9×101 milligrams per kilogram |
Estimated oceanic abundance: 3.4×10-6 milligrams per liter |
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