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Francium Cesium Comparison

Francium
Cesium
Cesium Francium comparison


Periodic Table
Symbol
Fr   
Cs   
Group Number
1   
17
1   
17
Period Number
7   
6   
Block
s block   
s block   
Element Family
Alkali   
Alkali   
CAS Number
7440735   
18
7440462   
40
Space Group Name
Not Available   
Im_ 3m   
Space Group Number
Not Available   
229.00   
1
Facts
Interesting Facts
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
Not Available   
Sources
Formed by Decay Process, Mining   
Earth's crust, Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Marguerite Perey   
Robert Bunsen and Gustav Kirchhoff   
Discovery
In 1939   
In 1860   
Abundance
  
  
Abundance In Universe
Not Available   
8 * 10-8 %   
24
Abundance In Sun
~-9999 %   
~0.0000008 %   
20
Abundance In Meteorites
Not Available   
0.00 %   
38
Abundance In Earth's Crust
Not Available   
0.00 %   
35
Abundance In Oceans
Not Available   
0.00 %   
17
Abundance In Humans
Not Available   
0.00 %   
17
Uses
Uses & Benefits
  • Francium has no known uses as it has a half life of only 22 minutes.
  
  • 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
NA   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys   
Biological Properties
  
  
Toxicity
NA   
Mildly Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
28
In Bone
0.00 p.p.m.   
36
0.05 p.p.m.   
26
Physical Properties
Melting Point
27.00 °C   
99+
28.50 °C   
99+
Boiling Point
677.00 °C   
99+
678.40 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
NA   
Silvery Gold   
Luster
NA   
NA   
Hardness
  
  
Mohs Hardness
Not Available   
0.20   
25
Brinell Hardness
Not Available   
0.14 MPa   
99+
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
Fr   
Cs   
Isotopes
  
  
Known Isotopes
33   
6
36   
3
Electronegativity
  
  
Pauling Electronegativity
0.70   
99+
0.79   
99+
Sanderson Electronegativity
Not Available   
0.22   
33
Allred Rochow Electronegativity
0.86   
99+
0.86   
99+
Mulliken-Jaffe Electronegativity
0.68   
25
0.62   
26
Allen Electronegativity
0.67   
99+
0.66   
99+
Electropositivity
  
  
Pauling Electropositivity
3.30   
1
3.21   
2
Ionization Energies
  
  
1st Energy Level
380.00 kJ/mol   
99+
375.70 kJ/mol   
99+
2nd Energy Level
Not Available   
2,234.30 kJ/mol   
8
3rd Energy Level
Not Available   
3,400.00 kJ/mol   
16
Electrochemical Equivalent
8.32 g/amp-hr   
1
4.96 g/amp-hr   
3
Electron Work Function
Not Available   
2.14 eV   
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
87   
31
55   
99+
Electron Configuration
[Rn] 7s1   
[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
87   
31
55   
99+
Number of Neutrons
136   
17
78   
99+
Number of Electrons
87   
31
55   
99+
Radius of an Atom
  
  
Atomic Radius
Not Available   
265.00 pm   
1
Covalent Radius
260.00 pm   
1
244.00 pm   
2
Van der Waals Radius
348.00 pm   
1
343.00 pm   
2
Atomic Weight
223.00 amu   
27
132.91 amu   
99+
Atomic Volume
Not Available   
71.07 cm3/mol   
1
Adjacent Atomic Numbers
  
  
Previous Element
Polonium
  
Tin
  
Next Element
Radium
  
Barium
  
Valence Electron Potential
8.00 (-eV)   
99+
8.62 (-eV)   
99+
Lattice Constant
Not Available   
614.10 pm   
5
Lattice Angles
NA   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
1.87 g/cm3   
99+
1.93 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
1.84 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Bulk Modulus
Not Available   
1.60 GPa   
99+
Young's Modulus
Not Available   
1.70 GPa   
99+
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
NA   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available   
1.87   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Poor Conductor   
Semiconductor   
Resistivity
3.00 nΩ·m   
99+
205.00 nΩ·m   
17
Electrical Conductivity
0.03 106/cm Ω   
40
0.05 106/cm Ω   
35
Electron Affinity
Not Available   
45.50 kJ/mol   
25
Thermal Properties
Specific Heat
Not Available   
0.24 J/(kg K)   
23
Molar Heat Capacity
Not Available   
32.21 J/mol·K   
4
Thermal Conductivity
15.00 W/m·K   
99+
35.90 W/m·K   
36
Critical Temperature
Not Available   
1,938.00 K   
5
Thermal Expansion
Not Available   
97.00 µm/(m·K)   
1
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
65.90 kJ/mol   
99+
Enthalpy of Fusion
Not Available   
2.10 kJ/mol   
99+
Enthalpy of Atomization
71.00 kJ/mol   
99+
78.20 kJ/mol   
99+
Standard Molar Entropy
Not Available   
85.20 J/mol.K   
3
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