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Lanthanum vs Cesium

Lanthanum
Cesium
Cesium vs Lanthanum


Periodic Table
Symbol
La  
Cs  
Group Number
3  
15
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  
7
229.00  
2
Facts
Interesting Facts
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
  
Cesium is the most alkaline metal and is used in atomic clocks.  
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
0.00 %  
23
0.00 %  
25
Abundance In Sun
0.00 %  
25
0.00 %  
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
0.00 %  
24
0.00 %  
20
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
-  
-  
Other Uses
Alloys, Mirror Manufacturing  
Alloys  
Biological Properties
  
  
Toxicity
Low Toxic  
Mildly Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.00 Blood/mg dm-3  
32
0.00 Blood/mg dm-3  
28
In Bone
0.08 p.p.m.  
29
0.05 p.p.m.  
31
Physical
Melting Point
920.00 °C  
99+
28.50 °C  
99+
Boiling Point
3,469.00 °C  
19
678.40 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery Gold  
Luster
-  
-  
Hardness
  
  
Mohs Hardness
2.50  
15
0.20  
27
Brinell Hardness
350.00 MPa  
36
0.14 MPa  
99+
Vickers Hardness
360.00 MPa  
99+
0.14 MPa  
99+
Speed of Sound
2,475.00 m/s  
99+
1,630.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.80  
22
1.93  
17
Reflectivity
70.00 %  
13
35.00 %  
34
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
La  
Cs  
Isotopes
  
  
Known Isotopes
31  
8
36  
3
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
0.79  
99+
Sanderson Electronegativity
1.10  
38
0.22  
99+
Allred Rochow Electronegativity
1.08  
32
0.86  
99+
Mulliken-Jaffe Electronegativity
1.10  
99+
0.62  
99+
Allen Electronegativity
1.10  
99+
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  
32
375.70 kJ/mol  
99+
5th Energy Level
5,940.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
6th Energy Level
5,380.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
7th Energy level
5,380.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
8th Energy Level
5,380.00 kJ/mol  
99+
3,760.00 kJ/mol  
99+
9th Energy Level
5,380.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
10th Energy Level
5,380.00 kJ/mol  
99+
3,757.00 kJ/mol  
99+
11th Energy Level
5,380.00 kJ/mol  
99+
3,757.00 kJ/mol  
99+
12th Energy Level
5,380.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
13th Energy Level
5,380.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
14th Energy Level
5,380.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
15th Energy Level
53,800.00 kJ/mol  
99+
37,500.00 kJ/mol  
99+
16th Energy Level
53,800.00 kJ/mol  
99+
375.70 kJ/mol  
99+
17th Energy Level
538.10 kJ/mol  
99+
375.70 kJ/mol  
99+
18th Energy Level
5,380.00 kJ/mol  
99+
3,757.00 kJ/mol  
99+
19th Energy Level
538.10 kJ/mol  
99+
375.70 kJ/mol  
99+
20th Energy Level
538.00 kJ/mol  
99+
375.00 kJ/mol  
99+
21st Energy Level
538.10 kJ/mol  
99+
375.70 kJ/mol  
99+
22nd Energy Level
538.00 kJ/mol  
99+
375.00 kJ/mol  
99+
23rd Energy Level
5,380.00 kJ/mol  
25
375.70 kJ/mol  
99+
24th Energy Level
538.00 kJ/mol  
99+
375.70 kJ/mol  
99+
25th Energy Level
538.00 kJ/mol  
99+
375.70 kJ/mol  
99+
26th Energy Level
538.00 kJ/mol  
99+
375.70 kJ/mol  
99+
27th Energy Level
538.10 kJ/mol  
99+
375.70 kJ/mol  
99+
28th Energy Level
538.00 kJ/mol  
99+
375.70 kJ/mol  
99+
29th Energy Level
538.10 kJ/mol  
99+
375.70 kJ/mol  
99+
30th Energy Level
538.00 kJ/mol  
99+
375.70 kJ/mol  
99+
Electrochemical Equivalent
1.73 g/amp-hr  
99+
4.96 g/amp-hr  
3
Electron Work Function
3.50 eV  
99+
2.14 eV  
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
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  
10
265.00 pm  
2
Covalent Radius
207.00 pm  
6
244.00 pm  
2
Van der Waals Radius
240.00 pm  
17
343.00 pm  
2
Atomic Weight
138.91 amu  
99+
132.91 amu  
99+
Atomic Volume
20.73 cm3/mol  
26
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  
31
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  
16
1.87  
3
Mechanical
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
45.00 MPa  
40
15.00 MPa  
99+
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.98 (Pa)  
15
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
14.30 GPa  
99+
30.00 GPa  
27
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
0.35  
9
Other Mechanical Properties
Ductile  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
6.17  
99+
1.87  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
15
0.00 H/m  
17
Susceptibility
0.00  
25
0.00  
24
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  
40
Electron Affinity
48.00 kJ/mol  
28
45.50 kJ/mol  
30
Thermal
Specific Heat
0.19 J/(kg K)  
33
0.24 J/(kg K)  
23
Molar Heat Capacity
27.11 J/mol·K  
27
32.21 J/mol·K  
6
Thermal Conductivity
13.40 W/m·K  
99+
35.90 W/m·K  
37
Critical Temperature
1,193.00 K  
99+
1,938.00 K  
22
Thermal Expansion
12.10 µm/(m·K)  
99+
97.00 µm/(m·K)  
1
Enthalpy
  
  
Enthalpy of Vaporization
399.60 kJ/mol  
24
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  
21
78.20 kJ/mol  
99+
Standard Molar Entropy
56.90 J/mol.K  
31
85.20 J/mol.K  
3
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Lanthanide Series

Lanthanide Series

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