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Cesium Lanthanum Comparison


Lanthanum Cesium comparison


Periodic Table

Symbol
Cs   
La   

Group Number
1   
17
Not Available   

Period Number
6   
6   

Block
s block   
f block   

Element Family
Alkali   
Lanthanide   

CAS Number
7440462   
40
7439910   
99+

Space Group Name
Im_ 3m   
P63/mmc   

Space Group Number
229.00   
1
194.00   
5

Facts

Interesting Facts
Not Available   
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
  

Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals   
Found in Minerals, Mining, Ores of Minerals   

History
  
  

Who Discovered
Robert Bunsen and Gustav Kirchhoff   
Carl Gustaf Mosander   

Discovery
In 1860   
In 1838   

Abundance
  
  

Abundance In Universe
8 * 10-8 %   
24
2 * 10-7 %   
22

Abundance In Sun
~0.0000008 %   
20
~0.0000002 %   
25

Abundance In Meteorites
0.00 %   
38
0.00 %   
32

Abundance In Earth's Crust
0.00 %   
35
0.00 %   
19

Abundance In Oceans
0.00 %   
17
0.00 %   
29

Abundance In Humans
0.00 %   
17
Not Available   

Uses

Uses & Benefits
  • 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.
  
  • 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.
  

Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Electrical Industry, Electronic Industry   

Medical Uses
NA   
NA   

Other Uses
Alloys   
Alloys, Mirror Manufacturing   

Biological Properties
  
  

Toxicity
Mildly Toxic   
Low Toxic   

Present in Human Body
Yes   
Yes   

In Blood
0.00 Blood/mg dm-3   
28
Not Available   

In Bone
0.05 p.p.m.   
26
0.08 p.p.m.   
24

Physical Properties

Melting Point
28.50 °C   
99+
920.00 °C   
99+

Boiling Point
678.40 °C   
99+
3,469.00 °C   
18

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silvery Gold   
Silvery White   

Luster
NA   
NA   

Hardness
  
  

Mohs Hardness
0.20   
25
2.50   
14

Brinell Hardness
0.14 MPa   
99+
350.00 MPa   
30

Vickers Hardness
Not Available   
360.00 MPa   
26

Speed of Sound
Not Available   
2,475.00 m/s   
37

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
Cs   
La   

Isotopes
  
  

Known Isotopes
36   
3
31   
8

Electronegativity
  
  

Pauling Electronegativity
0.79   
99+
1.10   
99+

Sanderson Electronegativity
0.22   
33
Not Available   

Allred Rochow Electronegativity
0.86   
99+
1.08   
31

Mulliken-Jaffe Electronegativity
0.62   
26
Not Available   

Allen Electronegativity
0.66   
99+
Not Available   

Electropositivity
  
  

Pauling Electropositivity
3.21   
2
2.90   
10

Ionization Energies
  
  

1st Energy Level
375.70 kJ/mol   
99+
538.10 kJ/mol   
99+

2nd Energy Level
2,234.30 kJ/mol   
8
1,067.00 kJ/mol   
99+

3rd Energy Level
3,400.00 kJ/mol   
16
1,850.30 kJ/mol   
99+

4th Energy Level
Not Available   
4,819.00 kJ/mol   
22

5th Energy Level
Not Available   
5,940.00 kJ/mol   
25

Electrochemical Equivalent
4.96 g/amp-hr   
3
1.73 g/amp-hr   
99+

Electron Work Function
2.14 eV   
99+
3.50 eV   
31

Other Chemical Properties
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes, Solubility   

Atomic Properties

Atomic Number
55   
99+
57   
99+

Electron Configuration
[Xe] 6s1   
[Xe] 5d2 6s2   

Crystal Structure
Body Centered Cubic (BCC)   
Double Hexagonal Close Packed (DHCP)   

Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   

Atom
  
  

Number of Protons
55   
99+
57   
99+

Number of Neutrons
78   
99+
82   
99+

Number of Electrons
55   
99+
57   
99+

Radius of an Atom
  
  

Atomic Radius
265.00 pm   
1
187.00 pm   
8

Covalent Radius
244.00 pm   
2
207.00 pm   
6

Van der Waals Radius
343.00 pm   
2
240.00 pm   
13

Atomic Weight
132.91 amu   
99+
138.91 amu   
99+

Atomic Volume
71.07 cm3/mol   
1
20.73 cm3/mol   
16

Adjacent Atomic Numbers
  
  

Previous Element
Tin
  
Barium
  

Next Element
Barium
  
Cerium
  

Valence Electron Potential
8.62 (-eV)   
99+
40.71 (-eV)   
99+

Lattice Constant
614.10 pm   
5
377.20 pm   
28

Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   

Lattice C/A Ratio
Not Available   
1.62   
2

Mechanical Properties

Density
  
  

Density At Room Temperature
1.93 g/cm3   
99+
6.16 g/cm3   
99+

Density When Liquid (at m.p.)
1.84 g/cm3   
99+
5.94 g/cm3   
99+

Tensile Strength
Not Available   
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Vapor Pressure at 2000 K
Not Available   
0.98 (Pa)   
15

Elasticity properties
  
  

Shear Modulus
Not Available   
14.30 GPa   
40

Bulk Modulus
1.60 GPa   
99+
27.90 GPa   
99+

Young's Modulus
1.70 GPa   
99+
36.60 GPa   
99+

Poisson Ratio
Not Available   
0.28   
17

Other Mechanical Properties
Ductile   
Ductile   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
1.87   
99+
6.17   
99+

Magnetic Ordering
Paramagnetic   
Paramagnetic   

Electrical Properties
  
  

Electrical Property
Semiconductor   
Conductor   

Resistivity
205.00 nΩ·m   
17
615.00 nΩ·m   
7

Electrical Conductivity
0.05 106/cm Ω   
35
0.01 106/cm Ω   
99+

Electron Affinity
45.50 kJ/mol   
25
48.00 kJ/mol   
23

Thermal Properties

Specific Heat
0.24 J/(kg K)   
23
0.19 J/(kg K)   
32

Molar Heat Capacity
32.21 J/mol·K   
4
27.11 J/mol·K   
21

Thermal Conductivity
35.90 W/m·K   
36
13.40 W/m·K   
99+

Critical Temperature
1,938.00 K   
5
Not Available   

Thermal Expansion
97.00 µm/(m·K)   
1
12.10 µm/(m·K)   
32

Enthalpy
  
  

Enthalpy of Vaporization
65.90 kJ/mol   
99+
399.60 kJ/mol   
17

Enthalpy of Fusion
2.10 kJ/mol   
99+
6.20 kJ/mol   
99+

Enthalpy of Atomization
78.20 kJ/mol   
99+
431.00 kJ/mol   
16

Standard Molar Entropy
85.20 J/mol.K   
3
56.90 J/mol.K   
23

Summary >>
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