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Lanthanum
Atomic Number: 57
Symbol: La
Atomic Weight: 138.9055
Discovery: Mosander 1839
Name Origin: From the Greek word lanthaneis (to lie hidden)
Electron Configuration: [Xe] 5d1 6s2
Group: lanthanide
Density @ 293 K: 6.7 g/cm3
Atomic Volume: 20.73 cm3/mol
Melting Point: 1193.2 K
Boiling Point: 3693 K
Heat of Fusion: 6.20 kJ/mol
Heat of Vaporization: 414.0 kJ/mol
1st Ionization Energy: 538.1 kJ/mole
2nd Ionization Energy: 1067 kJ/mole
3rd ionization Energy: 1850 kJ/mole
Electron Affinity: 50 kJ/mole
Electronegativity: 1.1
Specific Heat: 0.19 J/gK
Heat Atomization: 423 kJ/mole atoms
Shells: 2,8,18,18,9,2
Minimum Oxidation Number: 0
Maximum Oxidation Number: 3
Structure: hexagonal
Color: silvery-white
Uses: lighter flints, camera lenses, cathode ray tubes
Hardness: soft, malleable, ductile
Isotopes (half-life): Natural lanthanum is a mix of two isotopes, though more isotopes now exist. La-134 (6.5 minutes), La-137 (6000.0 years), La-138 (1.05E10 years), La-139 (stable), La-140 (1.67 days), La-141 (3.9 hours), La-142 (1.54 minutes)
Atomic Radius: 187 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
References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952)
Atomic Number: 57
Symbol: La
Atomic Weight: 138.9055
Discovery: Mosander 1839
Name Origin: From the Greek word lanthaneis (to lie hidden)
Electron Configuration: [Xe] 5d1 6s2
Group: lanthanide
Density @ 293 K: 6.7 g/cm3
Atomic Volume: 20.73 cm3/mol
Melting Point: 1193.2 K
Boiling Point: 3693 K
Heat of Fusion: 6.20 kJ/mol
Heat of Vaporization: 414.0 kJ/mol
1st Ionization Energy: 538.1 kJ/mole
2nd Ionization Energy: 1067 kJ/mole
3rd ionization Energy: 1850 kJ/mole
Electron Affinity: 50 kJ/mole
Electronegativity: 1.1
Specific Heat: 0.19 J/gK
Heat Atomization: 423 kJ/mole atoms
Shells: 2,8,18,18,9,2
Minimum Oxidation Number: 0
Maximum Oxidation Number: 3
Structure: hexagonal
Color: silvery-white
Uses: lighter flints, camera lenses, cathode ray tubes
Hardness: soft, malleable, ductile
Isotopes (half-life): Natural lanthanum is a mix of two isotopes, though more isotopes now exist. La-134 (6.5 minutes), La-137 (6000.0 years), La-138 (1.05E10 years), La-139 (stable), La-140 (1.67 days), La-141 (3.9 hours), La-142 (1.54 minutes)
Atomic Radius: 187 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
References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952)
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Ref: L57
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