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Bohrium vs Fermium

Bohrium
Fermium
Fermium vs Bohrium


Periodic Table
Symbol
Bh  
Fm  
Group Number
7  
11
3  
15
Period Number
7  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
54037148  
12
7440724  
19
Space Group Name
-  
-  
Space Group Number
276.00  
1
194.00  
7
Facts
Interesting Facts
  • Bohrium metal is also known as Unnilseptium (Uns) and Nielsbohrium (Ns).
  
  • Fermium metal is highly radioactive in nature.
  • Fermium is synthetically produced metal.
  
Sources
Found in Minerals, Mining, Synthetically Produced  
Bombarding Pu-239 with Neutrons  
History
  
  
Who Discovered
Gesellschaft für Schwerionenforschung  
Lawrence Berkeley National Laboratory  
Discovery
In 1981  
In 1952  
Abundance
  
  
Abundance In Universe
0.00 %  
37
0.00 %  
35
Abundance In Sun
-  
0.00 %  
30
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
-  
-  
Uses
Uses & Benefits
  • Currently known uses of Bohrium metal are limited to research purpose only.
  
  • Currently known uses of Fermium metal are limited to research purpose only.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
Research Purposes  
-  
Biological Properties
  
  
Toxicity
-  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
-  
1,527.00 °C  
26
Boiling Point
0.00 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
-  
Luster
Unknown Luster  
-  
Hardness
  
  
Mohs Hardness
7.00  
3
6.00  
6
Brinell Hardness
270.00 MPa  
99+
500.00 MPa  
28
Vickers Hardness
2,700.00 MPa  
4
600.00 MPa  
28
Speed of Sound
2,680.00 m/s  
99+
2,500.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.50  
36
1.30  
99+
Reflectivity
59.00 %  
24
59.00 %  
24
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Bh  
Fm  
Isotopes
  
  
Known Isotopes
5  
32
18  
21
Electronegativity
  
  
Pauling Electronegativity
2.00  
8
1.30  
33
Sanderson Electronegativity
1.30  
25
1.30  
25
Allred Rochow Electronegativity
1.30  
25
1.20  
28
Mulliken-Jaffe Electronegativity
1.30  
33
1.30  
33
Allen Electronegativity
2.00  
6
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.00  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
742.90 kJ/mol  
23
627.00 kJ/mol  
99+
2nd Energy Level
1,688.50 kJ/mol  
31
1,225.00 kJ/mol  
99+
3rd Energy Level
2,566.50 kJ/mol  
99+
2,363.00 kJ/mol  
99+
4th Energy Level
3,598.90 kJ/mol  
99+
3,792.00 kJ/mol  
99+
5th Energy Level
4,727.80 kJ/mol  
99+
6,270.00 kJ/mol  
39
6th Energy Level
5,991.70 kJ/mol  
99+
6,270.00 kJ/mol  
99+
7th Energy level
7,226.80 kJ/mol  
34
6,270.00 kJ/mol  
99+
8th Energy Level
7,100.00 kJ/mol  
33
6,270.00 kJ/mol  
99+
9th Energy Level
5,800.00 kJ/mol  
99+
7,040.00 kJ/mol  
33
10th Energy Level
7,100.00 kJ/mol  
35
6,270.00 kJ/mol  
99+
11th Energy Level
8,200.00 kJ/mol  
25
6,270.00 kJ/mol  
99+
12th Energy Level
82,700.00 kJ/mol  
4
62,700.00 kJ/mol  
10
13th Energy Level
7,100.00 kJ/mol  
29
6,270.00 kJ/mol  
38
14th Energy Level
8,200.00 kJ/mol  
17
6,270.00 kJ/mol  
27
15th Energy Level
82,000.00 kJ/mol  
14
62,700.00 kJ/mol  
38
16th Energy Level
71,100.00 kJ/mol  
20
62,700.00 kJ/mol  
28
17th Energy Level
820.00 kJ/mol  
31
627.00 kJ/mol  
99+
18th Energy Level
8,200.00 kJ/mol  
20
6,270.00 kJ/mol  
40
19th Energy Level
820.80 kJ/mol  
28
994.80 kJ/mol  
21
20th Energy Level
820.00 kJ/mol  
21
627.00 kJ/mol  
99+
21st Energy Level
8,200.00 kJ/mol  
11
627.00 kJ/mol  
99+
22nd Energy Level
820.00 kJ/mol  
16
345.00 kJ/mol  
99+
23rd Energy Level
8,200.00 kJ/mol  
8
6,270.00 kJ/mol  
14
24th Energy Level
820.00 kJ/mol  
12
627.60 kJ/mol  
38
25th Energy Level
820.00 kJ/mol  
10
627.00 kJ/mol  
40
26th Energy Level
820.00 kJ/mol  
10
627.60 kJ/mol  
39
27th Energy Level
820.00 kJ/mol  
9
627.60 kJ/mol  
99+
28th Energy Level
820.00 kJ/mol  
15
627.60 kJ/mol  
99+
29th Energy Level
820.00 kJ/mol  
14
627.60 kJ/mol  
99+
30th Energy Level
820.00 kJ/mol  
10
627.60 kJ/mol  
99+
Electrochemical Equivalent
3.00 g/amp-hr  
21
3.20 g/amp-hr  
15
Electron Work Function
4.90 eV  
12
4.47 eV  
21
Other Chemical Properties
Ionization, Radioactive Isotopes  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
107  
11
100  
18
Electron Configuration
[Rn] 5f14 6d5 7s2  
[Rn] 5f12 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Not Known  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
Unknown-Crystal-Structure-of-Fermium.jpg#100  
Atom
  
  
Number of Protons
107  
11
100  
18
Number of Neutrons
155  
9
157  
8
Number of Electrons
107  
11
100  
18
Radius of an Atom
  
  
Atomic Radius
128.00 pm  
99+
180.00 pm  
16
Covalent Radius
141.00 pm  
99+
180.00 pm  
23
Van der Waals Radius
0.00 pm  
99+
245.00 pm  
13
Atomic Weight
270.00 amu  
8
257.00 amu  
15
Atomic Volume
23.70 cm3/mol  
14
18.00 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Seaborgium
  
Einsteinium
  
Next Element
Hassium
  
Mendelevium
  
Valence Electron Potential
27.20 (-eV)  
99+
0.00 (-eV)  
99+
Lattice Constant
-  
350.00 pm  
99+
Lattice Angles
-  
-  
Lattice C/A Ratio
1.57  
99+
1.63  
13
Mechanical
Density
  
  
Density At Room Temperature
37.10 g/cm3  
3
9.70 g/cm3  
99+
Density When Liquid (at m.p.)
37.10 g/cm3  
3
9.70 g/cm3  
99+
Tensile Strength
152.00 MPa  
24
0.10 MPa  
99+
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
37
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
28.00 GPa  
32
30.00 GPa  
27
Bulk Modulus
37.00 GPa  
99+
50.00 GPa  
24
Young's Modulus
0.00 GPa  
99+
0.00 GPa  
99+
Poisson Ratio
0.35  
9
0.35  
9
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
37.00  
5
9.70  
99+
Magnetic Ordering
-  
-  
Permeability
0.00 H/m  
11
0.00 H/m  
16
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
6.50 nΩ·m  
99+
7.90 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
-  
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.10 J/(kg K)  
99+
Molar Heat Capacity
37.10 J/mol·K  
2
27.00 J/mol·K  
29
Thermal Conductivity
37.00 W/m·K  
36
0.00 W/m·K  
99+
Critical Temperature
1,323.00 K  
99+
1,323.00 K  
99+
Thermal Expansion
14.30 µm/(m·K)  
28
11.00 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
270.50 kJ/mol  
99+
319.20 kJ/mol  
99+
Enthalpy of Fusion
-  
13.30 kJ/mol  
30
Enthalpy of Atomization
-  
-  
Standard Molar Entropy
57.00 J/mol.K  
30
50.00 J/mol.K  
99+
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