Fermium vs Dubnium
Periodic Table
Symbol
Fm
Db
Group Number
Not Available
5
13
Period Number
7
7
Block
f block
d block
Element Family
Actinide
Transition Metal
CAS Number
7440724
19
53850354
14
Space Group Name
Not Available
Not Available
Space Group Number
Not Available
Not Available
Facts
Interesting Facts
- Fermium metal is highly radioactive in nature.
- Fermium is synthetically produced metal.
- IUPAC allotted a temporary name to Dubnium metal as “ Unnilpentium”.
- In the production of Dubnium, thermal gradient chromatography is used.
Sources
Bombarding Pu-239 with Neutrons
Produced by Bombarding Am243 with Ne22, Synthetically Produced
History
Who Discovered
Lawrence Berkeley National Laboratory
Joint Institute for Nuclear Research
Discovery
In 1952
In 1968
Abundance
Uses
Uses & Benefits
- Currently known uses of Fermium metal are limited to research purpose only.
- 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
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
1,527.00 °C
26
Not Available
Boiling Point
Not Available
Not Available
Appearance
Physical State
Solid
Solid
Luster
Not Defined
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
Fm
Db
Isotopes
Known Isotopes
18
21
10
28
Electronegativity
Pauling Electronegativity
1.30
32
Not Available
Allred Rochow Electronegativity
1.20
27
Not Available
Electropositivity
Pauling Electropositivity
2.70
22
Not Available
Ionization Energies
1st Energy Level
627.00 kJ/mol
99+
664.80 kJ/mol
38
2nd Energy Level
1,225.00 kJ/mol
99+
1,546.70 kJ/mol
38
3rd Energy Level
2,363.00 kJ/mol
99+
2,378.40 kJ/mol
99+
4th Energy Level
3,792.00 kJ/mol
99+
3,298.80 kJ/mol
99+
5th Energy Level
Not Available
4,305.20 kJ/mol
39
Electrochemical Equivalent
3.20 g/amp-hr
13
Not Available
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
100
18
105
13
Electron Configuration
[Rn] 5f12 7s2
[Rn] 5f14 6d3 7s2
Crystal Structure
Not Known
Body Centered Cubic (BCC)
Crystal Lattice
Unknown-Crystal-Structure-of-Fermium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
100
18
105
13
Number of Neutrons
157
7
157
7
Number of Electrons
100
18
105
13
Radius of an Atom
Atomic Radius
Not Available
139.00 pm
39
Covalent Radius
Not Available
149.00 pm
35
Van der Waals Radius
245.00 pm
9
Not Available
Atomic Weight
257.00 amu
15
268.00 amu
10
Atomic Volume
Not Available
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
Not Available
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
Not Available
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
Electrical Properties
Thermal Properties
Specific Heat
Not Available
Not Available
Molar Heat Capacity
Not Available
Not Available
Thermal Conductivity
Not Available
Not Available
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
Not Available
Enthalpy
Standard Molar Entropy
Not Available
Not Available
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