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Lanthanum vs Cesium

Lanthanum
Cesium
Cesium vs Lanthanum


Periodic Table
Symbol
La   
Cs   
Group Number
Not Available   
1   
17
Period Number
6   
6   
Block
f block   
s block   
Element Family
Lanthanide   
Alkali   
CAS Number
7439910   
99+
7440462   
40
Space Group Name
P63/mmc   
Im_ 3m   
Space Group Number
194.00   
5
229.00   
1
Facts
Interesting Facts
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
  
Not Available   
Sources
Found in Minerals, Mining, Ores of Minerals   
Earth's crust, Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Carl Gustaf Mosander   
Robert Bunsen and Gustav Kirchhoff   
Discovery
In 1838   
In 1860   
Abundance
  
  
Abundance In Universe
2 * 10-7 %   
22
8 * 10-8 %   
24
Abundance In Sun
~0.0000002 %   
25
~0.0000008 %   
20
Abundance In Meteorites
0.00 %   
32
0.00 %   
38
Abundance In Earth's Crust
0.00 %   
19
0.00 %   
35
Abundance In Oceans
0.00 %   
29
0.00 %   
17
Abundance In Humans
Not Available   
0.00 %   
17
Uses
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.
  
  • The most common use of cesium metal is as a drilling fluid. It is also used in optical glass manufacturing.
  • In vacuum tubes and radiation monitor equipment this metal is used as a catalyst promoter.
  
Industrial Uses
Electrical Industry, Electronic Industry   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Mirror Manufacturing   
Alloys   
Biological Properties
  
  
Toxicity
Low Toxic   
Mildly Toxic   
Present in Human Body
Yes   
Yes   
In Blood
Not Available   
0.00 Blood/mg dm-3   
28
In Bone
0.08 p.p.m.   
24
0.05 p.p.m.   
26
Physical Properties
Melting Point
920.00 °C   
99+
28.50 °C   
99+
Boiling Point
3,469.00 °C   
18
678.40 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery Gold   
Luster
NA   
NA   
Hardness
  
  
Mohs Hardness
2.50   
14
0.20   
25
Brinell Hardness
350.00 MPa   
30
0.14 MPa   
99+
Vickers Hardness
360.00 MPa   
26
Not Available   
Speed of Sound
2,475.00 m/s   
37
Not Available   
Optical Properties
  
  
Allotropes
No   
No   
α Allotropes
Not Available   
Not Available   
β Allotropes
Not Available   
Not Available   
γ Allotropes
Not Available   
Not Available   
Chemical Properties
Chemical Formula
La   
Cs   
Isotopes
  
  
Known Isotopes
31   
8
36   
3
Electronegativity
  
  
Pauling Electronegativity
1.10   
99+
0.79   
99+
Sanderson Electronegativity
Not Available   
0.22   
33
Allred Rochow Electronegativity
1.08   
31
0.86   
99+
Mulliken-Jaffe Electronegativity
Not Available   
0.62   
26
Allen Electronegativity
Not Available   
0.66   
99+
Electropositivity
  
  
Pauling Electropositivity
2.90   
10
3.21   
2
Ionization Energies
  
  
1st Energy Level
538.10 kJ/mol   
99+
375.70 kJ/mol   
99+
2nd Energy Level
1,067.00 kJ/mol   
99+
2,234.30 kJ/mol   
8
3rd Energy Level
1,850.30 kJ/mol   
99+
3,400.00 kJ/mol   
16
4th Energy Level
4,819.00 kJ/mol   
22
Not Available   
5th Energy Level
5,940.00 kJ/mol   
25
Not Available   
Electrochemical Equivalent
1.73 g/amp-hr   
99+
4.96 g/amp-hr   
3
Electron Work Function
3.50 eV   
31
2.14 eV   
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
57   
99+
55   
99+
Electron Configuration
[Xe] 5d2 6s2   
[Xe] 6s1   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Body Centered Cubic (BCC)   
Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
57   
99+
55   
99+
Number of Neutrons
82   
99+
78   
99+
Number of Electrons
57   
99+
55   
99+
Radius of an Atom
  
  
Atomic Radius
187.00 pm   
8
265.00 pm   
1
Covalent Radius
207.00 pm   
6
244.00 pm   
2
Van der Waals Radius
240.00 pm   
13
343.00 pm   
2
Atomic Weight
138.91 amu   
99+
132.91 amu   
99+
Atomic Volume
20.73 cm3/mol   
16
71.07 cm3/mol   
1
Adjacent Atomic Numbers
  
  
Previous Element
Barium
  
Tin
  
Next Element
Cerium
  
Barium
  
Valence Electron Potential
40.71 (-eV)   
99+
8.62 (-eV)   
99+
Lattice Constant
377.20 pm   
28
614.10 pm   
5
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
1.62   
2
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
6.16 g/cm3   
99+
1.93 g/cm3   
99+
Density When Liquid (at m.p.)
5.94 g/cm3   
99+
1.84 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.98 (Pa)   
15
Not Available   
Elasticity properties
  
  
Shear Modulus
14.30 GPa   
40
Not Available   
Bulk Modulus
27.90 GPa   
99+
1.60 GPa   
99+
Young's Modulus
36.60 GPa   
99+
1.70 GPa   
99+
Poisson Ratio
0.28   
17
Not Available   
Other Mechanical Properties
Ductile   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
6.17   
99+
1.87   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Semiconductor   
Resistivity
615.00 nΩ·m   
7
205.00 nΩ·m   
17
Electrical Conductivity
0.01 106/cm Ω   
99+
0.05 106/cm Ω   
35
Electron Affinity
48.00 kJ/mol   
23
45.50 kJ/mol   
25
Thermal Properties
Specific Heat
0.19 J/(kg K)   
32
0.24 J/(kg K)   
23
Molar Heat Capacity
27.11 J/mol·K   
21
32.21 J/mol·K   
4
Thermal Conductivity
13.40 W/m·K   
99+
35.90 W/m·K   
36
Critical Temperature
Not Available   
1,938.00 K   
5
Thermal Expansion
12.10 µm/(m·K)   
32
97.00 µm/(m·K)   
1
Enthalpy
  
  
Enthalpy of Vaporization
399.60 kJ/mol   
17
65.90 kJ/mol   
99+
Enthalpy of Fusion
6.20 kJ/mol   
99+
2.10 kJ/mol   
99+
Enthalpy of Atomization
431.00 kJ/mol   
16
78.20 kJ/mol   
99+
Standard Molar Entropy
56.90 J/mol.K   
23
85.20 J/mol.K   
3
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