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La Element
Lanthanum


Periodic Table
0
Symbol
La 0
Group Number
Not Available 0
Period Number
6 2
Block
f block 0
Element Family
Lanthanide 0
CAS Number
7439910 87
Space Group Name
P63/mmc 0
Space Group Number
194.00 5
Facts
0
Interesting Facts
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
0
Sources
Found in Minerals, Mining, Ores of Minerals 0
History
0
Who Discovered
Carl Gustaf Mosander 0
Discovery
In 1838 0
Abundance
0
Abundance In Universe
2 * 10-7 % 22
Abundance In Sun
~0.0000002 % 25
Abundance In Meteorites
0.00 % 32
Abundance In Earth's Crust
0.00 % 19
Abundance In Oceans
0.00 % 29
Abundance In Humans
Not Available 0
Uses
0
Uses & Benefits
  • It has no commercial uses, but its alloys are in high demand. Lanthanum and Nickel alloy is used for the hydrogen gas storage.
  • The best-known use for mischmetal alloy of Lanthanum is; as a ‘flints’ for cigarette lighters.
0
Industrial Uses
Electrical Industry, Electronic Industry 0
Medical Uses
NA 0
Other Uses
Alloys, Mirror Manufacturing 0
Biological Properties
0
Toxicity
Low Toxic 0
Present in Human Body
Yes 0
In Blood
Not Available 0
In Bone
0.08 p.p.m. 24
Physical
0
Melting Point
920.00 °C 49
Boiling Point
3,469.00 °C 18
Appearance
0
Physical State
Solid 0
Color
Silvery White 0
Luster
NA 0
Hardness
0
Mohs Hardness
2.50 14
Brinell Hardness
350.00 MPa 30
Vickers Hardness
360.00 MPa 26
Speed of Sound
2,475.00 m/s 37
Optical Properties
0
Refractive Index
Not Available 0
Reflectivity
Not Available 0
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
4th Energy Level
4,819.00 kJ/mol 22
5th Energy Level
5,940.00 kJ/mol 25
6th Energy Level
Not Available 0
7th Energy level
Not Available 0
8th Energy Level
Not Available 0
9th Energy Level
Not Available 0
10th Energy Level
Not Available 0
11th Energy Level
Not Available 0
12th Energy Level
Not Available 0
13th Energy Level
Not Available 0
14th Energy Level
Not Available 0
15th Energy Level
Not Available 0
16th Energy Level
Not Available 0
17th Energy Level
Not Available 0
18th Energy Level
Not Available 0
19th Energy Level
Not Available 0
20th Energy Level
Not Available 0
21st Energy Level
Not Available 0
22nd Energy Level
Not Available 0
23rd Energy Level
Not Available 0
24th Energy Level
Not Available 0
25th Energy Level
Not Available 0
26th Energy Level
Not Available 0
27th Energy Level
Not Available 0
28th Energy Level
Not Available 0
29th Energy Level
Not Available 0
30th Energy Level
Not Available 0
Electrochemical Equivalent
1.73 g/amp-hr 42
Electron Work Function
3.50 eV 31
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility 0
Atomic
0
Atomic Number
57 59
Electron Configuration
[Xe] 5d2 6s2 0
Crystal Structure
Double Hexagonal Close Packed (DHCP) 0
Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100 0
Atom
0
Number of Protons
57 58
Number of Neutrons
82 41
Number of Electrons
57 58
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
Atomic Weight
138.91 amu 53
Atomic Volume
20.73 cm3/mol 16
Adjacent Atomic Numbers
0
Previous Element
28 0
Next Element
49 0
Valence Electron Potential
40.71 (-eV) 46
Lattice Constant
377.20 pm 28
Lattice Angles
π/2, π/2, 2 π/3 0
Lattice C/A Ratio
1.62 2
Mechanical
0
Density
0
Density At Room Temperature
6.16 g/cm3 65
Density When Liquid (at m.p.)
5.94 g/cm3 44
Tensile Strength
Not Available 0
Viscosity
Not Available 0
Vapor Pressure
0
Vapor Pressure at 1000 K
Not Available 0
Vapor Pressure at 2000 K
0.98 (Pa) 15
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
Magnetic
0
Magnetic Characteristics
0
Specific Gravity
6.17 52
Magnetic Ordering
Paramagnetic 0
Permeability
Not Available 0
Susceptibility
Not Available 0
Electrical Properties
0
Electrical Property
Conductor 0
Resistivity
615.00 nΩ·m 7
Electrical Conductivity
0.01 106/cm Ω 51
Electron Affinity
48.00 kJ/mol 23
Thermal
0
Specific Heat
0.19 J/(kg K) 32
Molar Heat Capacity
27.11 J/mol·K 21
Thermal Conductivity
13.40 W/m·K 57
Critical Temperature
Not Available 0
Thermal Expansion
12.10 µm/(m·K) 32
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
Standard Molar Entropy
56.90 J/mol.K 23
Summary >>
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