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Mendelevium Francium Comparison

Mendelevium
Francium
Francium Mendelevium comparison


Periodic Table
Symbol
Md   
Fr   
Group Number
Not Available   
1   
17
Period Number
7   
7   
Block
f block   
s block   
Element Family
Actinide   
Alkali   
CAS Number
7440111   
99+
7440735   
18
Space Group Name
Not Available   
Not Available   
Space Group Number
Not Available   
Not Available   
Facts
Interesting Facts
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
Sources
Bombarding Einsteinium with Helium Ions   
Formed by Decay Process, Mining   
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory   
Marguerite Perey   
Discovery
In 1955   
In 1939   
Abundance
  
  
Uses
Uses & Benefits
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
  • 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
Unknown   
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
827.00 °C   
99+
27.00 °C   
99+
Boiling Point
Not Available   
677.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Unknown   
NA   
Luster
Metallic   
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
Md   
Fr   
Isotopes
  
  
Known Isotopes
16   
23
33   
6
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
0.70   
99+
Allred Rochow Electronegativity
1.20   
27
0.86   
99+
Mulliken-Jaffe Electronegativity
Not Available   
0.68   
25
Allen Electronegativity
Not Available   
0.67   
99+
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
3.30   
1
Ionization Energies
  
  
1st Energy Level
635.00 kJ/mol   
99+
380.00 kJ/mol   
99+
2nd Energy Level
1,235.00 kJ/mol   
99+
Not Available   
3rd Energy Level
2,470.00 kJ/mol   
99+
Not Available   
4th Energy Level
3,840.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
3.21 g/amp-hr   
12
8.32 g/amp-hr   
1
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
101   
17
87   
31
Electron Configuration
[Rn] 5f13 7s2   
[Rn] 7s1   
Crystal Structure
Not Known   
Body Centered Cubic (BCC)   
Crystal Lattice
Unknown-Crystal-Structure-of-Mendelevium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
101   
17
87   
31
Number of Neutrons
157   
7
136   
17
Number of Electrons
101   
17
87   
31
Radius of an Atom
  
  
Covalent Radius
Not Available   
260.00 pm   
1
Van der Waals Radius
246.00 pm   
8
348.00 pm   
1
Atomic Weight
258.00 amu   
14
223.00 amu   
27
Atomic Volume
Not Available   
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Fermium
  
Polonium
  
Next Element
Nobelium
  
Radium
  
Valence Electron Potential
Not Available   
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
Not Available   
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
Unknown   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Magnetic Ordering
Unknown   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Poor Conductor   
Resistivity
Not Available   
3.00 nΩ·m   
99+
Electrical Conductivity
Not Available   
0.03 106/cm Ω   
40
Thermal Properties
Specific Heat
Not Available   
Not Available   
Molar Heat Capacity
Not Available   
Not Available   
Thermal Conductivity
Not Available   
15.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
Not Available   
Enthalpy
  
  
Enthalpy of Atomization
Not Available   
71.00 kJ/mol   
99+
Standard Molar Entropy
Not Available   
Not Available   
Summary >>
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