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Dubnium vs Technetium

Dubnium
Technetium
Technetium vs Dubnium


Periodic Table
Symbol
Db  
Tc  
Group Number
5  
13
7  
11
Period Number
7  
5  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
53850354  
14
7440268  
99+
Space Group Name
-  
P63/mmc  
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.
  
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
Sources
Produced by Bombarding Am243 with Ne22, Synthetically Produced  
Made by Bombarding Molybdenum with Deuterons  
History
  
  
Who Discovered
Joint Institute for Nuclear Research  
Emilio Segrè and Carlo Perriero  
Discovery
In 1968  
In 1937  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
40
Abundance In Sun
-  
0.00 %  
18
Abundance In Meteorites
0.00 %  
99+
-  
Abundance In Earth's Crust
-  
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
-  
-  
Uses
Uses & Benefits
  • Currently known uses of Dubnium metal are limited to research purpose only.
  
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
Research Purposes  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
-  
Low Toxic  
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
-  
2,200.00 °C  
9
Boiling Point
0.00 °C  
99+
4,877.00 °C  
7
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
Shiny Gray  
Luster
Unknown Luster  
-  
Hardness
  
  
Mohs Hardness
6.00  
6
2.25  
16
Brinell Hardness
330.00 MPa  
38
550.00 MPa  
27
Vickers Hardness
400.00 MPa  
99+
500.00 MPa  
35
Speed of Sound
2,680.00 m/s  
99+
16,200.00 m/s  
1
Optical Properties
  
  
Refractive Index
1.20  
99+
1.90  
18
Reflectivity
55.00 %  
27
35.00 %  
34
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Db  
Tc  
Isotopes
  
  
Known Isotopes
10  
28
18  
21
Electronegativity
  
  
Pauling Electronegativity
2.20  
5
1.90  
12
Sanderson Electronegativity
1.30  
25
1.90  
13
Allred Rochow Electronegativity
1.30  
25
1.36  
21
Mulliken-Jaffe Electronegativity
1.10  
99+
1.90  
13
Allen Electronegativity
1.30  
40
1.51  
31
Electropositivity
  
  
Pauling Electropositivity
2.00  
99+
2.10  
99+
Ionization Energies
  
  
1st Energy Level
664.80 kJ/mol  
38
702.00 kJ/mol  
36
2nd Energy Level
1,546.70 kJ/mol  
39
1,470.00 kJ/mol  
99+
3rd Energy Level
2,378.40 kJ/mol  
99+
2,850.00 kJ/mol  
34
4th Energy Level
3,298.80 kJ/mol  
99+
7,020.00 kJ/mol  
14
5th Energy Level
4,305.20 kJ/mol  
99+
7,020.00 kJ/mol  
28
6th Energy Level
12,900.00 kJ/mol  
5
7,020.00 kJ/mol  
99+
7th Energy level
3,300.00 kJ/mol  
99+
4,700.00 kJ/mol  
99+
8th Energy Level
5,280.00 kJ/mol  
99+
4,700.00 kJ/mol  
99+
9th Energy Level
5,780.00 kJ/mol  
99+
7,020.00 kJ/mol  
35
10th Energy Level
8,830.00 kJ/mol  
22
7,020.00 kJ/mol  
39
11th Energy Level
3,300.00 kJ/mol  
99+
7,020.00 kJ/mol  
37
12th Energy Level
88,300.00 kJ/mol  
2
7,020.00 kJ/mol  
99+
13th Energy Level
4,760.00 kJ/mol  
99+
7,020.00 kJ/mol  
33
14th Energy Level
1,120.00 kJ/mol  
99+
7,020.00 kJ/mol  
23
15th Energy Level
33,000.00 kJ/mol  
99+
70,200.00 kJ/mol  
29
16th Energy Level
33,000.00 kJ/mol  
99+
70,200.00 kJ/mol  
24
17th Energy Level
1,129.00 kJ/mol  
19
702.50 kJ/mol  
99+
18th Energy Level
0.00 kJ/mol  
99+
7,020.00 kJ/mol  
35
19th Energy Level
1,094.90 kJ/mol  
18
702.00 kJ/mol  
99+
20th Energy Level
0.00 kJ/mol  
99+
702.00 kJ/mol  
35
21st Energy Level
883.00 kJ/mol  
36
702.00 kJ/mol  
99+
22nd Energy Level
330.00 kJ/mol  
99+
702.00 kJ/mol  
29
23rd Energy Level
1,150.00 kJ/mol  
33
702.00 kJ/mol  
99+
24th Energy Level
528.30 kJ/mol  
99+
702.50 kJ/mol  
28
25th Energy Level
0.00 kJ/mol  
99+
702.00 kJ/mol  
30
26th Energy Level
579.80 kJ/mol  
99+
702.00 kJ/mol  
29
27th Energy Level
0.00 kJ/mol  
99+
702.00 kJ/mol  
30
28th Energy Level
1,150.00 kJ/mol  
3
702.00 kJ/mol  
35
29th Energy Level
1,094.00 kJ/mol  
5
702.00 kJ/mol  
36
30th Energy Level
0.00 kJ/mol  
99+
702.00 kJ/mol  
30
Electrochemical Equivalent
3.00 g/amp-hr  
21
0.52 g/amp-hr  
99+
Electron Work Function
4.90 eV  
12
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
105  
13
43  
99+
Electron Configuration
[Rn] 5f14 6d3 7s2  
[Kr] 4d5 5s2  
Crystal Structure
Body Centered Cubic (BCC)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
HCP-Crystal-Structure-of-Technetium.jpg#100  
Atom
  
  
Number of Protons
105  
13
43  
99+
Number of Neutrons
157  
8
55  
99+
Number of Electrons
105  
13
43  
99+
Radius of an Atom
  
  
Atomic Radius
139.00 pm  
99+
136.00 pm  
99+
Covalent Radius
149.00 pm  
37
147.00 pm  
39
Van der Waals Radius
0.00 pm  
99+
200.00 pm  
35
Atomic Weight
268.00 amu  
10
98.00 amu  
99+
Atomic Volume
22.80 cm3/mol  
17
8.50 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Rutherfordium
  
Molybdenum
  
Next Element
Seaborgium
  
Ruthenium
  
Valence Electron Potential
0.00 (-eV)  
99+
180.00 (-eV)  
3
Lattice Constant
-  
273.50 pm  
99+
Lattice Angles
-  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.63  
14
1.60  
21
Mechanical
Density
  
  
Density At Room Temperature
29.30 g/cm3  
5
11.00 g/cm3  
36
Density When Liquid (at m.p.)
29.30 g/cm3  
6
11.00 g/cm3  
34
Tensile Strength
0.10 MPa  
99+
50.00 MPa  
38
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)  
99+
Elasticity properties
  
  
Shear Modulus
34.00 GPa  
22
27.00 GPa  
34
Bulk Modulus
39.00 GPa  
39
100.00 GPa  
16
Young's Modulus
0.00 GPa  
99+
50.00 GPa  
39
Poisson Ratio
0.39  
5
0.38  
6
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
39.00  
3
11.50  
37
Magnetic Ordering
-  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
6.80 nΩ·m  
99+
200.00 nΩ·m  
18
Electrical Conductivity
0.00 106/cm Ω  
99+
0.07 106/cm Ω  
35
Electron Affinity
-  
53.00 kJ/mol  
23
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.21 J/(kg K)  
30
Molar Heat Capacity
29.30 J/mol·K  
11
24.27 J/mol·K  
99+
Thermal Conductivity
0.00 W/m·K  
99+
50.60 W/m·K  
30
Critical Temperature
1,323.00 K  
99+
2,150.00 K  
16
Thermal Expansion
13.20 µm/(m·K)  
37
7.10 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
289.70 kJ/mol  
99+
660.00 kJ/mol  
7
Enthalpy of Fusion
-  
23.01 kJ/mol  
9
Enthalpy of Atomization
-  
649.00 kJ/mol  
9
Standard Molar Entropy
55.00 J/mol.K  
34
181.10 J/mol.K  
2
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