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Mendelevium Bohrium Comparison

Mendelevium
Bohrium
Bohrium Mendelevium comparison


Periodic Table
Symbol
Md  
Bh  
Group Number
3  
15
7  
11
Period Number
7  
7  
Block
f block  
d block  
Element Family
Actinide  
Transition Metal  
CAS Number
7440111  
99+
54037148  
12
Space Group Name
-  
-  
Space Group Number
194.00  
7
276.00  
1
Facts
Interesting Facts
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
  • Bohrium metal is also known as Unnilseptium (Uns) and Nielsbohrium (Ns).
  
Sources
Bombarding Einsteinium with Helium Ions  
Found in Minerals, Mining, Synthetically Produced  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory  
Gesellschaft für Schwerionenforschung  
Discovery
In 1955  
In 1981  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
37
Abundance In Sun
-  
-  
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
-  
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
-  
Uses
Uses & Benefits
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
  • Currently known uses of Bohrium 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
827.00 °C  
99+
-  
Boiling Point
0.00 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
-  
Luster
Metallic  
Unknown Luster  
Hardness
  
  
Mohs Hardness
-  
7.00  
3
Brinell Hardness
350.00 MPa  
36
270.00 MPa  
99+
Vickers Hardness
0.00 MPa  
99+
2,700.00 MPa  
4
Speed of Sound
2,680.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.50  
36
Reflectivity
66.00 %  
17
59.00 %  
24
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Md  
Bh  
Isotopes
  
  
Known Isotopes
16  
23
5  
32
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
2.00  
8
Sanderson Electronegativity
1.30  
25
1.30  
25
Allred Rochow Electronegativity
1.20  
28
1.30  
25
Mulliken-Jaffe Electronegativity
1.30  
33
1.30  
33
Allen Electronegativity
1.30  
40
2.00  
6
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.00  
99+
Ionization Energies
  
  
1st Energy Level
635.00 kJ/mol  
99+
742.90 kJ/mol  
23
2nd Energy Level
1,235.00 kJ/mol  
99+
1,688.50 kJ/mol  
31
3rd Energy Level
2,470.00 kJ/mol  
99+
2,566.50 kJ/mol  
99+
4th Energy Level
3,840.00 kJ/mol  
99+
3,598.90 kJ/mol  
99+
5th Energy Level
6,350.00 kJ/mol  
36
4,727.80 kJ/mol  
99+
6th Energy Level
6,350.00 kJ/mol  
99+
5,991.70 kJ/mol  
99+
7th Energy level
6,350.00 kJ/mol  
99+
7,226.80 kJ/mol  
34
8th Energy Level
6,350.00 kJ/mol  
99+
7,100.00 kJ/mol  
33
9th Energy Level
6,350.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
10th Energy Level
6,350.00 kJ/mol  
99+
7,100.00 kJ/mol  
35
11th Energy Level
6,400.00 kJ/mol  
99+
8,200.00 kJ/mol  
25
12th Energy Level
60,100.00 kJ/mol  
16
82,700.00 kJ/mol  
4
13th Energy Level
6,350.00 kJ/mol  
37
7,100.00 kJ/mol  
29
14th Energy Level
1,150.00 kJ/mol  
99+
8,200.00 kJ/mol  
17
15th Energy Level
63,500.00 kJ/mol  
37
82,000.00 kJ/mol  
14
16th Energy Level
635.00 kJ/mol  
99+
71,100.00 kJ/mol  
20
17th Energy Level
1,107.00 kJ/mol  
21
820.00 kJ/mol  
31
18th Energy Level
6,350.00 kJ/mol  
39
8,200.00 kJ/mol  
20
19th Energy Level
635.00 kJ/mol  
99+
820.80 kJ/mol  
28
20th Energy Level
635.00 kJ/mol  
40
820.00 kJ/mol  
21
21st Energy Level
6,350.00 kJ/mol  
13
8,200.00 kJ/mol  
11
22nd Energy Level
635.00 kJ/mol  
34
820.00 kJ/mol  
16
23rd Energy Level
6,350.00 kJ/mol  
13
8,200.00 kJ/mol  
8
24th Energy Level
635.00 kJ/mol  
36
820.00 kJ/mol  
12
25th Energy Level
635.00 kJ/mol  
38
820.00 kJ/mol  
10
26th Energy Level
635.00 kJ/mol  
37
820.00 kJ/mol  
10
27th Energy Level
635.00 kJ/mol  
39
820.00 kJ/mol  
9
28th Energy Level
635.00 kJ/mol  
99+
820.00 kJ/mol  
15
29th Energy Level
635.00 kJ/mol  
99+
820.00 kJ/mol  
14
30th Energy Level
635.00 kJ/mol  
40
820.00 kJ/mol  
10
Electrochemical Equivalent
3.21 g/amp-hr  
13
3.00 g/amp-hr  
21
Electron Work Function
3.89 eV  
37
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes  
Atomic
Atomic Number
101  
17
107  
11
Electron Configuration
[Rn] 5f13 7s2  
[Rn] 5f14 6d5 7s2  
Crystal Structure
Not Known  
Hexagonal Close Packed (HCP)  
Crystal Lattice
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
101  
17
107  
11
Number of Neutrons
157  
8
155  
9
Number of Electrons
101  
17
107  
11
Radius of an Atom
  
  
Atomic Radius
175.00 pm  
21
128.00 pm  
99+
Covalent Radius
175.00 pm  
25
141.00 pm  
99+
Van der Waals Radius
246.00 pm  
12
0.00 pm  
99+
Atomic Weight
258.00 amu  
14
270.00 amu  
8
Atomic Volume
19.90 cm3/mol  
32
23.70 cm3/mol  
14
Adjacent Atomic Numbers
  
  
Previous Element
Fermium
  
Seaborgium
  
Next Element
Nobelium
  
Hassium
  
Valence Electron Potential
63.70 (-eV)  
23
27.20 (-eV)  
99+
Lattice Constant
-  
-  
Lattice Angles
-  
-  
Lattice C/A Ratio
1.58  
36
1.57  
99+
Mechanical
Density
  
  
Density At Room Temperature
10.30 g/cm3  
38
37.10 g/cm3  
3
Density When Liquid (at m.p.)
10.30 g/cm3  
39
37.10 g/cm3  
3
Tensile Strength
80.00 MPa  
29
152.00 MPa  
24
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
32.00 GPa  
24
28.00 GPa  
32
Bulk Modulus
0.00 GPa  
99+
37.00 GPa  
99+
Young's Modulus
12.00 GPa  
99+
0.00 GPa  
99+
Poisson Ratio
0.30  
14
0.35  
9
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.50  
29
37.00  
5
Magnetic Ordering
-  
-  
Permeability
0.00 H/m  
11
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
0.63 nΩ·m  
99+
6.50 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
-  
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.10 J/(kg K)  
99+
Molar Heat Capacity
27.00 J/mol·K  
29
37.10 J/mol·K  
2
Thermal Conductivity
0.00 W/m·K  
99+
37.00 W/m·K  
36
Critical Temperature
1,100.00 K  
99+
1,323.00 K  
99+
Thermal Expansion
11.60 µm/(m·K)  
99+
14.30 µm/(m·K)  
28
Enthalpy
  
  
Enthalpy of Vaporization
380.50 kJ/mol  
26
270.50 kJ/mol  
99+
Enthalpy of Fusion
-  
-  
Enthalpy of Atomization
410.80 kJ/mol  
25
-  
Standard Molar Entropy
37.40 J/mol.K  
99+
57.00 J/mol.K  
30
Summary >>
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