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Lanthanum Properties
Lanthanum


Physical
0
Melting Point
920.00 °C 49
Boiling Point
3,469.00 °C 18
Hardness
0
Mohs Hardness
2.50 14
Brinell Hardness
350.00 MPa 30
Vickers Hardness
360.00 MPa 26
Optical Properties
0
Refractive Index
Not Available 0
Reflectivity
Not Available 0
Speed of Sound
2,475.00 m/s 37
Allotropes
No 0
α Allotropes
Not Available 0
β Allotropes
Not Available 0
γ Allotropes
Not Available 0
Chemical
0
Chemical Formula
La 0
Isotopes
0
Known Isotopes
31 8
Electronegativity
0
Pauling Electronegativity
1.10 44
Sanderson Electronegativity
Not Available 0
Allred Rochow Electronegativity
1.08 31
Mulliken-Jaffe Electronegativity
Not Available 0
Allen Electronegativity
Not Available 0
Electropositivity
0
Pauling Electropositivity
2.90 10
Ionization Energies
0
1st Energy Level
538.10 kJ/mol 75
2nd Energy Level
1,067.00 kJ/mol 76
3rd Energy Level
1,850.30 kJ/mol 80
Electrochemical Equivalent
1.73 g/amp-hr 42
Electron Work Function
3.50 eV 31
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility 0
Mechanical
0
Density
0
Density At Room Temperature
6.16 g/cm3 65
Density When Liquid (at m.p.)
5.94 g/cm3 44
Vapor Pressure
0
Vapor Pressure at 1000 K
Not Available 0
Vapor Pressure at 2000 K
0.98 (Pa) 15
Tensile Strength
Not Available 0
Viscosity
Not Available 0
Elasticity properties
0
Shear Modulus
14.30 GPa 40
Bulk Modulus
27.90 GPa 41
Young's Modulus
36.60 GPa 42
Poisson Ratio
0.28 17
Other Mechanical Properties
Ductile 0
Periodic Table
0
Symbol
La 0
Group Number
Not Available 0
Period Number
6 2
Block
f block 0
Element Family
Lanthanide 0
Atomic
0
Atomic Number
57 59
Atomic Weight
138.91 amu 53
Atomic Volume
20.73 cm3/mol 16
Electron Configuration
[Xe] 5d2 6s2 0
Valence Electron Potential
40.71 (-eV) 46
Atom
0
Number of Protons
57 58
Number of Neutrons
82 41
Number of Electrons
57 58
Crystal Structure
Double Hexagonal Close Packed (DHCP) 0
Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100 0
Radius of an Atom
0
Atomic Radius
187.00 pm 8
Covalent Radius
207.00 pm 6
Van der Waals Radius
240.00 pm 13
Lattice Constant
377.20 pm 28
Lattice Angles
π/2, π/2, 2 π/3 0
Lattice C/A Ratio
1.62 2
Adjacent Atomic Numbers
0
Next Element
49 0
Previous Element
28 0
Magnetic
0
Electrical Properties
0
Resistivity
615.00 nΩ·m 7
Electrical Conductivity
0.01 106/cm Ω 51
Electron Affinity
48.00 kJ/mol 23
Electrical Property
Conductor 0
Magnetic Characteristics
0
Specific Gravity
6.17 52
Magnetic Ordering
Paramagnetic 0
Permeability
Not Available 0
Susceptibility
Not Available 0
Thermal
0
Specific Heat
0.19 J/(kg K) 32
Thermal Conductivity
13.40 W/m·K 57
Critical Temperature
Not Available 0
Molar Heat Capacity
27.11 J/mol·K 21
Thermal Expansion
12.10 µm/(m·K) 32
Standard Molar Entropy
56.90 J/mol.K 23
Enthalpy
0
Enthalpy of Vaporization
399.60 kJ/mol 17
Enthalpy of Fusion
6.20 kJ/mol 49
Enthalpy of Atomization
431.00 kJ/mol 16
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