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Mining technician in exploration or exploitation department to improve...
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Resources: Periodic table
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 =>La2 O3
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): La2 O3
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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SEKOM Handelsges.m.b.H....
Our company is a private firm founded in 1990 with aim to develop export and import with Russia. We do promote EU industrial and consumer goods in Russia and strongly support marketing of Russian and CIS industrial products and services.
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