Home
 Compare Metals

Francium vs Dubnium

Francium
Dubnium
Dubnium vs Francium


Periodic Table
Symbol
Fr   
Db   
Group Number
1   
17
5   
13
Period Number
7   
7   
Block
s block   
d block   
Element Family
Alkali   
Transition Metal   
CAS Number
7440735   
18
53850354   
14
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.
  
  • IUPAC allotted a temporary name to Dubnium metal as “ Unnilpentium”.
  • In the production of Dubnium, thermal gradient chromatography is used.
  
Sources
Formed by Decay Process, Mining   
Produced by Bombarding Am243 with Ne22, Synthetically Produced   
History
  
  
Who Discovered
Marguerite Perey   
Joint Institute for Nuclear Research   
Discovery
In 1939   
In 1968   
Abundance
  
  
Uses
Uses & Benefits
  • Francium has no known uses as it has a half life of only 22 minutes.
  
  • Currently known uses of Dubnium metal are limited to research purpose only.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
NA   
Research Purposes   
Biological Properties
  
  
Toxicity
NA   
Unknown   
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+
Not Available   
Boiling Point
677.00 °C   
99+
Not Available   
Appearance
  
  
Physical State
Solid   
Solid   
Color
NA   
Unknown   
Luster
NA   
Unknown Luster   
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   
Db   
Isotopes
  
  
Known Isotopes
33   
6
10   
28
Electronegativity
  
  
Pauling Electronegativity
0.70   
99+
Not Available   
Allred Rochow Electronegativity
0.86   
99+
Not Available   
Mulliken-Jaffe Electronegativity
0.68   
25
Not Available   
Allen Electronegativity
0.67   
99+
Not Available   
Electropositivity
  
  
Pauling Electropositivity
3.30   
1
Not Available   
Ionization Energies
  
  
1st Energy Level
380.00 kJ/mol   
99+
664.80 kJ/mol   
38
2nd Energy Level
Not Available   
1,546.70 kJ/mol   
38
3rd Energy Level
Not Available   
2,378.40 kJ/mol   
99+
4th Energy Level
Not Available   
3,298.80 kJ/mol   
99+
5th Energy Level
Not Available   
4,305.20 kJ/mol   
39
Electrochemical Equivalent
8.32 g/amp-hr   
1
Not Available   
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
87   
31
105   
13
Electron Configuration
[Rn] 7s1   
[Rn] 5f14 6d3 7s2   
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
105   
13
Number of Neutrons
136   
17
157   
7
Number of Electrons
87   
31
105   
13
Radius of an Atom
  
  
Atomic Radius
Not Available   
139.00 pm   
39
Covalent Radius
260.00 pm   
1
149.00 pm   
35
Van der Waals Radius
348.00 pm   
1
Not Available   
Atomic Weight
223.00 amu   
27
268.00 amu   
10
Atomic Volume
Not Available   
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Polonium
  
Rutherfordium
  
Next Element
Radium
  
Seaborgium
  
Valence Electron Potential
8.00 (-eV)   
99+
Not Available   
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+
29.30 g/cm3   
5
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   
Unknown   
Magnetic Properties
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic   
Unknown   
Electrical Properties
  
  
Electrical Property
Poor Conductor   
Unknown   
Resistivity
3.00 nΩ·m   
99+
Not Available   
Electrical Conductivity
0.03 106/cm Ω   
40
Not Available   
Thermal Properties
Specific Heat
Not Available   
Not Available   
Molar Heat Capacity
Not Available   
Not Available   
Thermal Conductivity
15.00 W/m·K   
99+
Not Available   
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
Not Available   
Enthalpy
  
  
Enthalpy of Atomization
71.00 kJ/mol   
99+
Not Available   
Standard Molar Entropy
Not Available   
Not Available   
Periodic Table >>
<< All

Compare All Metals

All Metals

All Metals

Compare All Metals

Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!