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Dubnium vs Mendelevium

Dubnium
Mendelevium
Mendelevium vs Dubnium


Periodic Table
Symbol
Db  
Md  
Group Number
5  
13
3  
15
Period Number
7  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
53850354  
14
7440111  
99+
Space Group Name
-  
-  
Space Group Number
166.00  
9
194.00  
7
Facts
Interesting Facts
  • IUPAC allotted a temporary name to Dubnium metal as “ Unnilpentium”.
  • In the production of Dubnium, thermal gradient chromatography is used.
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Produced by Bombarding Am243 with Ne22, Synthetically Produced  
Bombarding Einsteinium with Helium Ions  
History
  
  
Who Discovered
Joint Institute for Nuclear Research  
Lawrence Berkeley National Laboratory  
Discovery
In 1968  
In 1955  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
40
Abundance In Sun
-  
-  
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
-  
-  
Abundance In Oceans
-  
-  
Abundance In Humans
-  
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Dubnium metal are limited to research purpose only.
  
  • Currently known uses of Mendelevium 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
Unknown Luster  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
-  
Brinell Hardness
330.00 MPa  
38
350.00 MPa  
36
Vickers Hardness
400.00 MPa  
99+
0.00 MPa  
99+
Speed of Sound
2,680.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.20  
99+
1.30  
99+
Reflectivity
55.00 %  
27
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Db  
Md  
Isotopes
  
  
Known Isotopes
10  
28
16  
23
Electronegativity
  
  
Pauling Electronegativity
2.20  
5
1.30  
33
Sanderson Electronegativity
1.30  
25
1.30  
25
Allred Rochow Electronegativity
1.30  
25
1.20  
28
Mulliken-Jaffe Electronegativity
1.10  
99+
1.30  
33
Allen Electronegativity
1.30  
40
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.00  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
664.80 kJ/mol  
38
635.00 kJ/mol  
99+
2nd Energy Level
1,546.70 kJ/mol  
39
1,235.00 kJ/mol  
99+
3rd Energy Level
2,378.40 kJ/mol  
99+
2,470.00 kJ/mol  
99+
4th Energy Level
3,298.80 kJ/mol  
99+
3,840.00 kJ/mol  
99+
5th Energy Level
4,305.20 kJ/mol  
99+
6,350.00 kJ/mol  
36
6th Energy Level
12,900.00 kJ/mol  
5
6,350.00 kJ/mol  
99+
7th Energy level
3,300.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
8th Energy Level
5,280.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
9th Energy Level
5,780.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
10th Energy Level
8,830.00 kJ/mol  
22
6,350.00 kJ/mol  
99+
11th Energy Level
3,300.00 kJ/mol  
99+
6,400.00 kJ/mol  
99+
12th Energy Level
88,300.00 kJ/mol  
2
60,100.00 kJ/mol  
16
13th Energy Level
4,760.00 kJ/mol  
99+
6,350.00 kJ/mol  
37
14th Energy Level
1,120.00 kJ/mol  
99+
1,150.00 kJ/mol  
99+
15th Energy Level
33,000.00 kJ/mol  
99+
63,500.00 kJ/mol  
37
16th Energy Level
33,000.00 kJ/mol  
99+
635.00 kJ/mol  
99+
17th Energy Level
1,129.00 kJ/mol  
19
1,107.00 kJ/mol  
21
18th Energy Level
0.00 kJ/mol  
99+
6,350.00 kJ/mol  
39
19th Energy Level
1,094.90 kJ/mol  
18
635.00 kJ/mol  
99+
20th Energy Level
0.00 kJ/mol  
99+
635.00 kJ/mol  
40
21st Energy Level
883.00 kJ/mol  
36
6,350.00 kJ/mol  
13
22nd Energy Level
330.00 kJ/mol  
99+
635.00 kJ/mol  
34
23rd Energy Level
1,150.00 kJ/mol  
33
6,350.00 kJ/mol  
13
24th Energy Level
528.30 kJ/mol  
99+
635.00 kJ/mol  
36
25th Energy Level
0.00 kJ/mol  
99+
635.00 kJ/mol  
38
26th Energy Level
579.80 kJ/mol  
99+
635.00 kJ/mol  
37
27th Energy Level
0.00 kJ/mol  
99+
635.00 kJ/mol  
39
28th Energy Level
1,150.00 kJ/mol  
3
635.00 kJ/mol  
99+
29th Energy Level
1,094.00 kJ/mol  
5
635.00 kJ/mol  
99+
30th Energy Level
0.00 kJ/mol  
99+
635.00 kJ/mol  
40
Electrochemical Equivalent
3.00 g/amp-hr  
21
3.21 g/amp-hr  
13
Electron Work Function
4.90 eV  
12
3.89 eV  
37
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
105  
13
101  
17
Electron Configuration
[Rn] 5f14 6d3 7s2  
[Rn] 5f13 7s2  
Crystal Structure
Body Centered Cubic (BCC)  
Not Known  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
105  
13
101  
17
Number of Neutrons
157  
8
157  
8
Number of Electrons
105  
13
101  
17
Radius of an Atom
  
  
Atomic Radius
139.00 pm  
99+
175.00 pm  
21
Covalent Radius
149.00 pm  
37
175.00 pm  
25
Van der Waals Radius
0.00 pm  
99+
246.00 pm  
12
Atomic Weight
268.00 amu  
10
258.00 amu  
14
Atomic Volume
22.80 cm3/mol  
17
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Rutherfordium
  
Fermium
  
Next Element
Seaborgium
  
Nobelium
  
Valence Electron Potential
0.00 (-eV)  
99+
63.70 (-eV)  
23
Lattice Constant
-  
-  
Lattice Angles
-  
-  
Lattice C/A Ratio
1.63  
14
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
29.30 g/cm3  
5
10.30 g/cm3  
38
Density When Liquid (at m.p.)
29.30 g/cm3  
6
10.30 g/cm3  
39
Tensile Strength
0.10 MPa  
99+
80.00 MPa  
29
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
34.00 GPa  
22
32.00 GPa  
24
Bulk Modulus
39.00 GPa  
39
0.00 GPa  
99+
Young's Modulus
0.00 GPa  
99+
12.00 GPa  
99+
Poisson Ratio
0.39  
5
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
39.00  
3
13.50  
29
Magnetic Ordering
-  
-  
Permeability
0.00 H/m  
17
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
6.80 nΩ·m  
99+
0.63 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
29.30 J/mol·K  
11
27.00 J/mol·K  
29
Thermal Conductivity
0.00 W/m·K  
99+
0.00 W/m·K  
99+
Critical Temperature
1,323.00 K  
99+
1,100.00 K  
99+
Thermal Expansion
13.20 µm/(m·K)  
37
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
289.70 kJ/mol  
99+
380.50 kJ/mol  
26
Enthalpy of Fusion
-  
-  
Enthalpy of Atomization
-  
410.80 kJ/mol  
25
Standard Molar Entropy
55.00 J/mol.K  
34
37.40 J/mol.K  
99+
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