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Technetium vs Mendelevium

Technetium
Mendelevium
Mendelevium vs Technetium


Periodic Table
Symbol
Tc  
Md  
Group Number
7  
11
3  
15
Period Number
5  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7440268  
99+
7440111  
99+
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Made by Bombarding Molybdenum with Deuterons  
Bombarding Einsteinium with Helium Ions  
History
  
  
Who Discovered
Emilio Segrè and Carlo Perriero  
Lawrence Berkeley National Laboratory  
Discovery
In 1937  
In 1955  
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
-  
0.00 %  
24
Uses
Uses & Benefits
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
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
827.00 °C  
99+
Boiling Point
4,877.00 °C  
7
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Shiny Gray  
-  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
2.25  
16
-  
Brinell Hardness
550.00 MPa  
27
350.00 MPa  
36
Vickers Hardness
500.00 MPa  
35
0.00 MPa  
99+
Speed of Sound
16,200.00 m/s  
1
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.90  
18
1.30  
99+
Reflectivity
35.00 %  
34
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Tc  
Md  
Isotopes
  
  
Known Isotopes
18  
21
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.90  
12
1.30  
33
Sanderson Electronegativity
1.90  
13
1.30  
25
Allred Rochow Electronegativity
1.36  
21
1.20  
28
Mulliken-Jaffe Electronegativity
1.90  
13
1.30  
33
Allen Electronegativity
1.51  
31
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.10  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
702.00 kJ/mol  
36
635.00 kJ/mol  
99+
2nd Energy Level
1,470.00 kJ/mol  
99+
1,235.00 kJ/mol  
99+
3rd Energy Level
2,850.00 kJ/mol  
34
2,470.00 kJ/mol  
99+
4th Energy Level
7,020.00 kJ/mol  
14
3,840.00 kJ/mol  
99+
5th Energy Level
7,020.00 kJ/mol  
28
6,350.00 kJ/mol  
36
6th Energy Level
7,020.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
7th Energy level
4,700.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
8th Energy Level
4,700.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
9th Energy Level
7,020.00 kJ/mol  
35
6,350.00 kJ/mol  
99+
10th Energy Level
7,020.00 kJ/mol  
39
6,350.00 kJ/mol  
99+
11th Energy Level
7,020.00 kJ/mol  
37
6,400.00 kJ/mol  
99+
12th Energy Level
7,020.00 kJ/mol  
99+
60,100.00 kJ/mol  
16
13th Energy Level
7,020.00 kJ/mol  
33
6,350.00 kJ/mol  
37
14th Energy Level
7,020.00 kJ/mol  
23
1,150.00 kJ/mol  
99+
15th Energy Level
70,200.00 kJ/mol  
29
63,500.00 kJ/mol  
37
16th Energy Level
70,200.00 kJ/mol  
24
635.00 kJ/mol  
99+
17th Energy Level
702.50 kJ/mol  
99+
1,107.00 kJ/mol  
21
18th Energy Level
7,020.00 kJ/mol  
35
6,350.00 kJ/mol  
39
19th Energy Level
702.00 kJ/mol  
99+
635.00 kJ/mol  
99+
20th Energy Level
702.00 kJ/mol  
35
635.00 kJ/mol  
40
21st Energy Level
702.00 kJ/mol  
99+
6,350.00 kJ/mol  
13
22nd Energy Level
702.00 kJ/mol  
29
635.00 kJ/mol  
34
23rd Energy Level
702.00 kJ/mol  
99+
6,350.00 kJ/mol  
13
24th Energy Level
702.50 kJ/mol  
28
635.00 kJ/mol  
36
25th Energy Level
702.00 kJ/mol  
30
635.00 kJ/mol  
38
26th Energy Level
702.00 kJ/mol  
29
635.00 kJ/mol  
37
27th Energy Level
702.00 kJ/mol  
30
635.00 kJ/mol  
39
28th Energy Level
702.00 kJ/mol  
35
635.00 kJ/mol  
99+
29th Energy Level
702.00 kJ/mol  
36
635.00 kJ/mol  
99+
30th Energy Level
702.00 kJ/mol  
30
635.00 kJ/mol  
40
Electrochemical Equivalent
0.52 g/amp-hr  
99+
3.21 g/amp-hr  
13
Electron Work Function
4.90 eV  
12
3.89 eV  
37
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
43  
99+
101  
17
Electron Configuration
[Kr] 4d5 5s2  
[Rn] 5f13 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Not Known  
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
43  
99+
101  
17
Number of Neutrons
55  
99+
157  
8
Number of Electrons
43  
99+
101  
17
Radius of an Atom
  
  
Atomic Radius
136.00 pm  
99+
175.00 pm  
21
Covalent Radius
147.00 pm  
39
175.00 pm  
25
Van der Waals Radius
200.00 pm  
35
246.00 pm  
12
Atomic Weight
98.00 amu  
99+
258.00 amu  
14
Atomic Volume
8.50 cm3/mol  
99+
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Molybdenum
  
Fermium
  
Next Element
Ruthenium
  
Nobelium
  
Valence Electron Potential
180.00 (-eV)  
3
63.70 (-eV)  
23
Lattice Constant
273.50 pm  
99+
-  
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.60  
21
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
11.00 g/cm3  
36
10.30 g/cm3  
38
Density When Liquid (at m.p.)
11.00 g/cm3  
34
10.30 g/cm3  
39
Tensile Strength
50.00 MPa  
38
80.00 MPa  
29
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)  
99+
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
27.00 GPa  
34
32.00 GPa  
24
Bulk Modulus
100.00 GPa  
16
0.00 GPa  
99+
Young's Modulus
50.00 GPa  
39
12.00 GPa  
99+
Poisson Ratio
0.38  
6
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
11.50  
37
13.50  
29
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
17
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
200.00 nΩ·m  
18
0.63 nΩ·m  
99+
Electrical Conductivity
0.07 106/cm Ω  
35
0.00 106/cm Ω  
99+
Electron Affinity
53.00 kJ/mol  
23
50.00 kJ/mol  
26
Thermal
Specific Heat
0.21 J/(kg K)  
30
0.10 J/(kg K)  
99+
Molar Heat Capacity
24.27 J/mol·K  
99+
27.00 J/mol·K  
29
Thermal Conductivity
50.60 W/m·K  
30
0.00 W/m·K  
99+
Critical Temperature
2,150.00 K  
16
1,100.00 K  
99+
Thermal Expansion
7.10 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
660.00 kJ/mol  
7
380.50 kJ/mol  
26
Enthalpy of Fusion
23.01 kJ/mol  
9
-  
Enthalpy of Atomization
649.00 kJ/mol  
9
410.80 kJ/mol  
25
Standard Molar Entropy
181.10 J/mol.K  
2
37.40 J/mol.K  
99+
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