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Cesium vs Europium

Cesium
Europium
Europium vs Cesium


Periodic Table
Symbol
Cs  
Eu  
Group Number
1  
17
Not Available  
Period Number
6  
6  
Block
s block  
f block  
Element Family
Alkali  
Lanthanide  
CAS Number
7440462  
40
7440531  
34
Space Group Name
Im_ 3m  
Im_ 3m  
Space Group Number
229.00  
1
229.00  
1
Facts
Interesting Facts
Not Available  
Not Available  
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  
Eugène-Anatole Demarçay  
Discovery
In 1860  
In 1896  
Abundance
  
  
Abundance In Universe
8 * 10-8 %  
24
5 * 10-8 %  
27
Abundance In Sun
~0.0000008 %  
20
~0.00000005 %  
27
Abundance In Meteorites
0.00 %  
38
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
35
0.00 %  
36
Abundance In Oceans
0.00 %  
17
0.00 %  
99+
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.
  
  • Europium metals main uses is in the printing of euro banknotes. These notes glow red under UV light.
  • It is used in low energy light bulbs.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Chemical Industry  
Medical Uses
NA  
NA  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Mildly Toxic  
Non 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
Not Available  
Physical Properties
Melting Point
28.50 °C  
99+
822.00 °C  
99+
Boiling Point
678.40 °C  
99+
1,597.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Gold  
Silvery White  
Luster
NA  
Lustrous  
Hardness
  
  
Mohs Hardness
0.20  
25
Not Available  
Brinell Hardness
0.14 MPa  
99+
Not Available  
Vickers Hardness
Not Available  
167.00 MPa  
34
Speed of Sound
Not Available  
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
Cs  
Eu  
Isotopes
  
  
Known Isotopes
36  
3
31  
8
Electronegativity
  
  
Pauling Electronegativity
0.79  
99+
1.20  
39
Sanderson Electronegativity
0.22  
33
1.01  
22
Allred Rochow Electronegativity
0.86  
99+
Not Available  
Mulliken-Jaffe Electronegativity
0.62  
26
Not Available  
Allen Electronegativity
0.66  
99+
Not Available  
Electropositivity
  
  
Pauling Electropositivity
3.21  
2
Not Available  
Ionization Energies
  
  
1st Energy Level
375.70 kJ/mol  
99+
547.10 kJ/mol  
99+
2nd Energy Level
2,234.30 kJ/mol  
8
1,085.00 kJ/mol  
99+
3rd Energy Level
3,400.00 kJ/mol  
16
2,404.00 kJ/mol  
99+
4th Energy Level
Not Available  
4,120.00 kJ/mol  
33
Electrochemical Equivalent
4.96 g/amp-hr  
3
1.89 g/amp-hr  
33
Electron Work Function
2.14 eV  
99+
2.50 eV  
99+
Other Chemical Properties
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Solubility  
Atomic Properties
Atomic Number
55  
99+
63  
99+
Electron Configuration
[Xe] 6s1  
[Xe] 4f7 6s2  
Crystal Structure
Body Centered Cubic (BCC)  
Body Centered Cubic (BCC)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
55  
99+
63  
99+
Number of Neutrons
78  
99+
89  
38
Number of Electrons
55  
99+
63  
99+
Radius of an Atom
  
  
Atomic Radius
265.00 pm  
1
180.00 pm  
14
Covalent Radius
244.00 pm  
2
198.00 pm  
13
Van der Waals Radius
343.00 pm  
2
233.00 pm  
18
Atomic Weight
132.91 amu  
99+
151.96 amu  
99+
Atomic Volume
71.07 cm3/mol  
1
28.90 cm3/mol  
8
Adjacent Atomic Numbers
  
  
Previous Element
Tin
  
Samarium
  
Next Element
Barium
  
Gadolinium
  
Valence Electron Potential
8.62 (-eV)  
99+
45.60 (-eV)  
35
Lattice Constant
614.10 pm  
5
458.10 pm  
17
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
Not Available  
Not Available  
Mechanical Properties
Density
  
  
Density At Room Temperature
1.93 g/cm3  
99+
5.26 g/cm3  
99+
Density When Liquid (at m.p.)
1.84 g/cm3  
99+
5.13 g/cm3  
99+
Tensile Strength
Not Available  
120.00 MPa  
15
Viscosity
Not Available  
Not Available  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available  
19.40 (Pa)  
4
Elasticity properties
  
  
Shear Modulus
Not Available  
7.90 GPa  
99+
Bulk Modulus
1.60 GPa  
99+
8.30 GPa  
99+
Young's Modulus
1.70 GPa  
99+
18.20 GPa  
99+
Poisson Ratio
Not Available  
0.15  
34
Other Mechanical Properties
Ductile  
Ductile  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
1.87  
99+
5.24  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
Semiconductor  
Conductor  
Resistivity
205.00 nΩ·m  
17
0.90 nΩ·m  
99+
Electrical Conductivity
0.05 106/cm Ω  
35
0.01 106/cm Ω  
99+
Electron Affinity
45.50 kJ/mol  
25
50.00 kJ/mol  
21
Thermal Properties
Specific Heat
0.24 J/(kg K)  
23
0.18 J/(kg K)  
33
Molar Heat Capacity
32.21 J/mol·K  
4
27.66 J/mol·K  
16
Thermal Conductivity
35.90 W/m·K  
36
13.90 W/m·K  
99+
Critical Temperature
1,938.00 K  
5
Not Available  
Thermal Expansion
97.00 µm/(m·K)  
1
35.00 µm/(m·K)  
8
Enthalpy
  
  
Enthalpy of Vaporization
65.90 kJ/mol  
99+
143.50 kJ/mol  
99+
Enthalpy of Fusion
2.10 kJ/mol  
99+
9.21 kJ/mol  
37
Enthalpy of Atomization
78.20 kJ/mol  
99+
180.00 kJ/mol  
99+
Standard Molar Entropy
85.20 J/mol.K  
3
77.80 J/mol.K  
4
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