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Cesium vs Francium

Cesium
Francium
Francium vs Cesium


Periodic Table
Symbol
Cs  
Fr  
Group Number
1  
17
1  
17
Period Number
6  
7  
Block
s block  
s block  
Element Family
Alkali  
Alkali  
CAS Number
7440462  
40
7440735  
18
Space Group Name
Im_ 3m  
-  
Space Group Number
229.00  
2
225.00  
3
Facts
Interesting Facts
Cesium is the most alkaline metal and is used in atomic clocks.  
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals  
Formed by Decay Process, Mining  
History
  
  
Who Discovered
Robert Bunsen and Gustav Kirchhoff  
Marguerite Perey  
Discovery
In 1860  
In 1939  
Abundance
  
  
Abundance In Universe
0.00 %  
25
0.00 %  
40
Abundance In Sun
0.00 %  
20
0.00 %  
30
Abundance In Meteorites
0.00 %  
38
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
35
0.00 %  
99+
Abundance In Oceans
0.00 %  
17
-  
Abundance In Humans
0.00 %  
20
0.00 %  
24
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.
  
  • Francium has no known uses as it has a half life of only 22 minutes.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Mildly Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
28
0.00 Blood/mg dm-3  
40
In Bone
0.05 p.p.m.  
31
0.00 p.p.m.  
99+
Physical
Melting Point
28.50 °C  
99+
27.00 °C  
99+
Boiling Point
678.40 °C  
99+
677.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Gold  
-  
Luster
-  
-  
Hardness
  
  
Mohs Hardness
0.20  
27
0.20  
27
Brinell Hardness
0.14 MPa  
99+
119.00 MPa  
99+
Vickers Hardness
0.14 MPa  
99+
300.00 MPa  
99+
Speed of Sound
1,630.00 m/s  
99+
2,440.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.93  
17
1.70  
27
Reflectivity
35.00 %  
34
72.00 %  
11
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cs  
Fr  
Isotopes
  
  
Known Isotopes
36  
3
33  
6
Electronegativity
  
  
Pauling Electronegativity
0.79  
99+
0.70  
99+
Sanderson Electronegativity
0.22  
99+
0.70  
99+
Allred Rochow Electronegativity
0.86  
99+
0.86  
99+
Mulliken-Jaffe Electronegativity
0.62  
99+
0.68  
99+
Allen Electronegativity
0.66  
99+
0.67  
99+
Electropositivity
  
  
Pauling Electropositivity
3.21  
2
3.30  
1
Ionization Energies
  
  
1st Energy Level
375.70 kJ/mol  
99+
380.00 kJ/mol  
99+
2nd Energy Level
2,234.30 kJ/mol  
8
392.80 kJ/mol  
99+
3rd Energy Level
3,400.00 kJ/mol  
16
392.80 kJ/mol  
99+
4th Energy Level
375.70 kJ/mol  
99+
392.80 kJ/mol  
99+
5th Energy Level
3,750.00 kJ/mol  
99+
392.00 kJ/mol  
99+
6th Energy Level
3,750.00 kJ/mol  
99+
3,920.00 kJ/mol  
99+
7th Energy level
3,750.00 kJ/mol  
99+
3,920.00 kJ/mol  
99+
8th Energy Level
3,760.00 kJ/mol  
99+
3,920.00 kJ/mol  
99+
9th Energy Level
3,750.00 kJ/mol  
99+
3,920.00 kJ/mol  
99+
10th Energy Level
3,757.00 kJ/mol  
99+
392.00 kJ/mol  
99+
11th Energy Level
3,757.00 kJ/mol  
99+
392.00 kJ/mol  
99+
12th Energy Level
3,750.00 kJ/mol  
99+
38,000.00 kJ/mol  
23
13th Energy Level
3,750.00 kJ/mol  
99+
3,920.00 kJ/mol  
99+
14th Energy Level
3,750.00 kJ/mol  
99+
380.00 kJ/mol  
99+
15th Energy Level
37,500.00 kJ/mol  
99+
67,700.00 kJ/mol  
32
16th Energy Level
375.70 kJ/mol  
99+
39,200.00 kJ/mol  
99+
17th Energy Level
375.70 kJ/mol  
99+
392.00 kJ/mol  
99+
18th Energy Level
3,757.00 kJ/mol  
99+
3,920.00 kJ/mol  
99+
19th Energy Level
375.70 kJ/mol  
99+
392.80 kJ/mol  
99+
20th Energy Level
375.00 kJ/mol  
99+
392.00 kJ/mol  
99+
21st Energy Level
375.70 kJ/mol  
99+
392.00 kJ/mol  
99+
22nd Energy Level
375.00 kJ/mol  
99+
392.00 kJ/mol  
99+
23rd Energy Level
375.70 kJ/mol  
99+
392.80 kJ/mol  
99+
24th Energy Level
375.70 kJ/mol  
99+
392.00 kJ/mol  
99+
25th Energy Level
375.70 kJ/mol  
99+
392.00 kJ/mol  
99+
26th Energy Level
375.70 kJ/mol  
99+
392.80 kJ/mol  
99+
27th Energy Level
375.70 kJ/mol  
99+
392.00 kJ/mol  
99+
28th Energy Level
375.70 kJ/mol  
99+
380.00 kJ/mol  
99+
29th Energy Level
375.70 kJ/mol  
99+
392.00 kJ/mol  
99+
30th Energy Level
375.70 kJ/mol  
99+
677.00 kJ/mol  
31
Electrochemical Equivalent
4.96 g/amp-hr  
3
8.32 g/amp-hr  
1
Electron Work Function
2.14 eV  
99+
4.07 eV  
33
Other Chemical Properties
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
55  
99+
87  
31
Electron Configuration
[Xe] 6s1  
[Rn] 7s1  
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+
87  
31
Number of Neutrons
78  
99+
136  
18
Number of Electrons
55  
99+
87  
31
Radius of an Atom
  
  
Atomic Radius
265.00 pm  
2
348.00 pm  
1
Covalent Radius
244.00 pm  
2
260.00 pm  
1
Van der Waals Radius
343.00 pm  
2
348.00 pm  
1
Atomic Weight
132.91 amu  
99+
223.00 amu  
27
Atomic Volume
71.07 cm3/mol  
1
71.00 cm3/mol  
2
Adjacent Atomic Numbers
  
  
Previous Element
Tin
  
Polonium
  
Next Element
Barium
  
Radium
  
Valence Electron Potential
8.62 (-eV)  
99+
8.00 (-eV)  
99+
Lattice Constant
614.10 pm  
5
440.00 pm  
21
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.87  
3
1.56  
99+
Mechanical
Density
  
  
Density At Room Temperature
1.93 g/cm3  
99+
1.87 g/cm3  
99+
Density When Liquid (at m.p.)
1.84 g/cm3  
99+
1.87 g/cm3  
99+
Tensile Strength
15.00 MPa  
99+
50.00 MPa  
38
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
3.60 GPa  
99+
Bulk Modulus
1.60 GPa  
99+
6.00 GPa  
99+
Young's Modulus
1.70 GPa  
99+
0.00 GPa  
99+
Poisson Ratio
0.35  
9
0.44  
3
Other Mechanical Properties
Ductile  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
1.87  
99+
0.87  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
13
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Semiconductor  
Poor Conductor  
Resistivity
205.00 nΩ·m  
17
3.00 nΩ·m  
99+
Electrical Conductivity
0.05 106/cm Ω  
40
0.03 106/cm Ω  
99+
Electron Affinity
45.50 kJ/mol  
30
0.70 kJ/mol  
99+
Thermal
Specific Heat
0.24 J/(kg K)  
23
0.15 J/(kg K)  
37
Molar Heat Capacity
32.21 J/mol·K  
6
27.00 J/mol·K  
29
Thermal Conductivity
35.90 W/m·K  
37
15.00 W/m·K  
99+
Critical Temperature
1,938.00 K  
22
300.00 K  
99+
Thermal Expansion
97.00 µm/(m·K)  
1
18.90 µm/(m·K)  
25
Enthalpy
  
  
Enthalpy of Vaporization
65.90 kJ/mol  
99+
67.00 kJ/mol  
99+
Enthalpy of Fusion
2.10 kJ/mol  
99+
2.30 kJ/mol  
99+
Enthalpy of Atomization
78.20 kJ/mol  
99+
71.00 kJ/mol  
99+
Standard Molar Entropy
85.20 J/mol.K  
3
42.00 J/mol.K  
99+
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