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Francium vs Francium

Francium
Francium
Francium vs Francium


Periodic Table
Symbol
Fr   
Fr   
Group Number
1   
17
1   
17
Period Number
7   
7   
Block
s block   
s block   
Element Family
Alkali   
Alkali   
CAS Number
7440735   
18
7440735   
18
Space Group Name
Not Available   
Not Available   
Space Group Number
Not Available   
Not Available   
Facts
Interesting Facts
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
Sources
Formed by Decay Process, Mining   
Formed by Decay Process, Mining   
History
  
  
Who Discovered
Marguerite Perey   
Marguerite Perey   
Discovery
In 1939   
In 1939   
Abundance
  
  
Uses
Uses & Benefits
  • Francium has no known uses as it has a half life of only 22 minutes.
  
  • Francium has no known uses as it has a half life of only 22 minutes.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
NA   
NA   
Biological Properties
  
  
Toxicity
NA   
NA   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
37
In Bone
0.00 p.p.m.   
36
0.00 p.p.m.   
36
Physical Properties
Melting Point
27.00 °C   
99+
27.00 °C   
99+
Boiling Point
677.00 °C   
99+
677.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
NA   
NA   
Luster
NA   
NA   
Hardness
  
  
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   
Fr   
Isotopes
  
  
Known Isotopes
33   
6
33   
6
Electronegativity
  
  
Pauling Electronegativity
0.70   
99+
0.70   
99+
Allred Rochow Electronegativity
0.86   
99+
0.86   
99+
Mulliken-Jaffe Electronegativity
0.68   
25
0.68   
25
Allen Electronegativity
0.67   
99+
0.67   
99+
Electropositivity
  
  
Pauling Electropositivity
3.30   
1
3.30   
1
Ionization Energies
  
  
1st Energy Level
380.00 kJ/mol   
99+
380.00 kJ/mol   
99+
Electrochemical Equivalent
8.32 g/amp-hr   
1
8.32 g/amp-hr   
1
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
87   
31
87   
31
Electron Configuration
[Rn] 7s1   
[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
87   
31
87   
31
Number of Neutrons
136   
17
136   
17
Number of Electrons
87   
31
87   
31
Radius of an Atom
  
  
Covalent Radius
260.00 pm   
1
260.00 pm   
1
Van der Waals Radius
348.00 pm   
1
348.00 pm   
1
Atomic Weight
223.00 amu   
27
223.00 amu   
27
Atomic Volume
Not Available   
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Polonium
  
Polonium
  
Next Element
Radium
  
Radium
  
Valence Electron Potential
8.00 (-eV)   
99+
8.00 (-eV)   
99+
Lattice Constant
Not Available   
Not Available   
Lattice Angles
NA   
NA   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
1.87 g/cm3   
99+
1.87 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Poor Conductor   
Poor Conductor   
Resistivity
3.00 nΩ·m   
99+
3.00 nΩ·m   
99+
Electrical Conductivity
0.03 106/cm Ω   
40
0.03 106/cm Ω   
40
Thermal Properties
Specific Heat
Not Available   
Not Available   
Molar Heat Capacity
Not Available   
Not Available   
Thermal Conductivity
15.00 W/m·K   
99+
15.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
Not Available   
Enthalpy
  
  
Enthalpy of Atomization
71.00 kJ/mol   
99+
71.00 kJ/mol   
99+
Standard Molar Entropy
Not Available   
Not Available   
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