Francium vs Dubnium
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
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
|
||
|
||
|
