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Europium vs Cesium

Europium
Cesium
Cesium vs Europium


Periodic Table
Symbol
Eu  
Cs  
Group Number
3  
15
1  
17
Period Number
6  
6  
Block
f block  
s block  
Element Family
Lanthanide  
Alkali  
CAS Number
7440531  
34
7440462  
40
Space Group Name
Im_ 3m  
Im_ 3m  
Space Group Number
229.00  
2
229.00  
2
Facts
Interesting Facts
Europium is used in Euro banknotes for security features.  
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
Eugène-Anatole Demarçay  
Robert Bunsen and Gustav Kirchhoff  
Discovery
In 1896  
In 1860  
Abundance
  
  
Abundance In Universe
0.00 %  
28
0.00 %  
25
Abundance In Sun
0.00 %  
27
0.00 %  
20
Abundance In Meteorites
0.00 %  
99+
0.00 %  
38
Abundance In Earth's Crust
0.00 %  
36
0.00 %  
35
Abundance In Oceans
0.00 %  
99+
0.00 %  
17
Abundance In Humans
0.00 %  
24
0.00 %  
20
Uses
Uses & Benefits
  • 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.
  
  • 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
Chemical Industry  
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Non Toxic  
Mildly Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
28
In Bone
0.00 p.p.m.  
99+
0.05 p.p.m.  
31
Physical
Melting Point
822.00 °C  
99+
28.50 °C  
99+
Boiling Point
1,597.00 °C  
99+
678.40 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery Gold  
Luster
Lustrous  
-  
Hardness
  
  
Mohs Hardness
2.00  
17
0.20  
27
Brinell Hardness
167.00 MPa  
99+
0.14 MPa  
99+
Vickers Hardness
167.00 MPa  
99+
0.14 MPa  
99+
Speed of Sound
6,320.00 m/s  
4
1,630.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.83  
19
1.93  
17
Reflectivity
65.00 %  
18
35.00 %  
34
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Eu  
Cs  
Isotopes
  
  
Known Isotopes
31  
8
36  
3
Electronegativity
  
  
Pauling Electronegativity
1.20  
40
0.79  
99+
Sanderson Electronegativity
1.01  
99+
0.22  
99+
Allred Rochow Electronegativity
1.20  
28
0.86  
99+
Mulliken-Jaffe Electronegativity
1.20  
39
0.62  
99+
Allen Electronegativity
1.20  
99+
0.66  
99+
Electropositivity
  
  
Pauling Electropositivity
2.50  
27
3.21  
2
Ionization Energies
  
  
1st Energy Level
547.10 kJ/mol  
99+
375.70 kJ/mol  
99+
2nd Energy Level
1,085.00 kJ/mol  
99+
2,234.30 kJ/mol  
8
3rd Energy Level
2,404.00 kJ/mol  
99+
3,400.00 kJ/mol  
16
4th Energy Level
4,120.00 kJ/mol  
99+
375.70 kJ/mol  
99+
5th Energy Level
5,471.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
6th Energy Level
5,471.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
7th Energy level
5,470.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
8th Energy Level
5,470.00 kJ/mol  
99+
3,760.00 kJ/mol  
99+
9th Energy Level
5,990.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
10th Energy Level
5,470.00 kJ/mol  
99+
3,757.00 kJ/mol  
99+
11th Energy Level
5,470.00 kJ/mol  
99+
3,757.00 kJ/mol  
99+
12th Energy Level
5,470.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
13th Energy Level
5,800.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
14th Energy Level
5,470.00 kJ/mol  
99+
3,750.00 kJ/mol  
99+
15th Energy Level
54,700.00 kJ/mol  
99+
37,500.00 kJ/mol  
99+
16th Energy Level
54,700.00 kJ/mol  
99+
375.70 kJ/mol  
99+
17th Energy Level
547.10 kJ/mol  
99+
375.70 kJ/mol  
99+
18th Energy Level
5,470.00 kJ/mol  
99+
3,757.00 kJ/mol  
99+
19th Energy Level
547.10 kJ/mol  
99+
375.70 kJ/mol  
99+
20th Energy Level
547.00 kJ/mol  
99+
375.00 kJ/mol  
99+
21st Energy Level
547.10 kJ/mol  
99+
375.70 kJ/mol  
99+
22nd Energy Level
547.00 kJ/mol  
99+
375.00 kJ/mol  
99+
23rd Energy Level
547.10 kJ/mol  
99+
375.70 kJ/mol  
99+
24th Energy Level
547.10 kJ/mol  
99+
375.70 kJ/mol  
99+
25th Energy Level
547.00 kJ/mol  
99+
375.70 kJ/mol  
99+
26th Energy Level
547.10 kJ/mol  
99+
375.70 kJ/mol  
99+
27th Energy Level
547.10 kJ/mol  
99+
375.70 kJ/mol  
99+
28th Energy Level
580.70 kJ/mol  
99+
375.70 kJ/mol  
99+
29th Energy Level
547.10 kJ/mol  
99+
375.70 kJ/mol  
99+
30th Energy Level
547.10 kJ/mol  
99+
375.70 kJ/mol  
99+
Electrochemical Equivalent
1.89 g/amp-hr  
37
4.96 g/amp-hr  
3
Electron Work Function
2.50 eV  
99+
2.14 eV  
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
63  
99+
55  
99+
Electron Configuration
[Xe] 4f7 6s2  
[Xe] 6s1  
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
63  
99+
55  
99+
Number of Neutrons
89  
39
78  
99+
Number of Electrons
63  
99+
55  
99+
Radius of an Atom
  
  
Atomic Radius
180.00 pm  
16
265.00 pm  
2
Covalent Radius
198.00 pm  
13
244.00 pm  
2
Van der Waals Radius
233.00 pm  
22
343.00 pm  
2
Atomic Weight
151.96 amu  
99+
132.91 amu  
99+
Atomic Volume
28.90 cm3/mol  
11
71.07 cm3/mol  
1
Adjacent Atomic Numbers
  
  
Previous Element
Samarium
  
Tin
  
Next Element
Gadolinium
  
Barium
  
Valence Electron Potential
45.60 (-eV)  
36
8.62 (-eV)  
99+
Lattice Constant
458.10 pm  
19
614.10 pm  
5
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.58  
35
1.87  
3
Mechanical
Density
  
  
Density At Room Temperature
5.26 g/cm3  
99+
1.93 g/cm3  
99+
Density When Liquid (at m.p.)
5.13 g/cm3  
99+
1.84 g/cm3  
99+
Tensile Strength
120.00 MPa  
27
15.00 MPa  
99+
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
19.40 (Pa)  
4
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
7.90 GPa  
99+
30.00 GPa  
27
Bulk Modulus
8.30 GPa  
99+
1.60 GPa  
99+
Young's Modulus
18.20 GPa  
99+
1.70 GPa  
99+
Poisson Ratio
0.15  
35
0.35  
9
Other Mechanical Properties
Ductile  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
5.24  
99+
1.87  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
15
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
Semiconductor  
Resistivity
0.90 nΩ·m  
99+
205.00 nΩ·m  
17
Electrical Conductivity
0.01 106/cm Ω  
99+
0.05 106/cm Ω  
40
Electron Affinity
50.00 kJ/mol  
26
45.50 kJ/mol  
30
Thermal
Specific Heat
0.18 J/(kg K)  
34
0.24 J/(kg K)  
23
Molar Heat Capacity
27.66 J/mol·K  
19
32.21 J/mol·K  
6
Thermal Conductivity
13.90 W/m·K  
99+
35.90 W/m·K  
37
Critical Temperature
1,099.00 K  
99+
1,938.00 K  
22
Thermal Expansion
35.00 µm/(m·K)  
8
97.00 µm/(m·K)  
1
Enthalpy
  
  
Enthalpy of Vaporization
143.50 kJ/mol  
99+
65.90 kJ/mol  
99+
Enthalpy of Fusion
9.21 kJ/mol  
99+
2.10 kJ/mol  
99+
Enthalpy of Atomization
180.00 kJ/mol  
99+
78.20 kJ/mol  
99+
Standard Molar Entropy
77.80 J/mol.K  
4
85.20 J/mol.K  
3
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