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Rhenium vs Mendelevium

Rhenium
Mendelevium
Mendelevium vs Rhenium


Periodic Table
Symbol
Re  
Md  
Group Number
7  
11
3  
15
Period Number
6  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7440155  
99+
7440111  
99+
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Chemical properties of Rhenium are similar to Manganese.
  • Rhenium metal is created while refining Molybdenum.
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Bombarding Einsteinium with Helium Ions  
History
  
  
Who Discovered
Masataka Ogawa  
Lawrence Berkeley National Laboratory  
Discovery
In 1908  
In 1955  
Abundance
  
  
Abundance In Universe
0.00 %  
30
0.00 %  
40
Abundance In Sun
0.00 %  
29
-  
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
-  
Abundance In Oceans
0.00 %  
34
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Alloys of Rhenium are used as an electric contact material. It can resist withstand arc corrosion.
  • Its catalysts are used in hydrogenation of fine chemicals. Its Alloy with nickel is used to produce turbine blades.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Low Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
37
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
3,180.00 °C  
2
827.00 °C  
99+
Boiling Point
5,627.00 °C  
2
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Gray  
-  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
7.00  
3
-  
Brinell Hardness
1,320.00 MPa  
8
350.00 MPa  
36
Vickers Hardness
1,350.00 MPa  
12
0.00 MPa  
99+
Speed of Sound
4,700.00 m/s  
19
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.90  
18
1.30  
99+
Reflectivity
70.00 %  
13
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Re  
Md  
Isotopes
  
  
Known Isotopes
33  
6
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.90  
12
1.30  
33
Sanderson Electronegativity
1.90  
13
1.30  
25
Allred Rochow Electronegativity
1.46  
16
1.20  
28
Mulliken-Jaffe Electronegativity
1.90  
13
1.30  
33
Allen Electronegativity
1.60  
24
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.10  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
760.00 kJ/mol  
20
635.00 kJ/mol  
99+
2nd Energy Level
1,260.00 kJ/mol  
99+
1,235.00 kJ/mol  
99+
3rd Energy Level
2,510.00 kJ/mol  
99+
2,470.00 kJ/mol  
99+
4th Energy Level
3,640.00 kJ/mol  
99+
3,840.00 kJ/mol  
99+
5th Energy Level
7,600.00 kJ/mol  
20
6,350.00 kJ/mol  
36
6th Energy Level
7,600.00 kJ/mol  
37
6,350.00 kJ/mol  
99+
7th Energy level
7,600.00 kJ/mol  
31
6,350.00 kJ/mol  
99+
8th Energy Level
5,560.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
9th Energy Level
5,560.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
10th Energy Level
7,600.00 kJ/mol  
31
6,350.00 kJ/mol  
99+
11th Energy Level
7,600.00 kJ/mol  
30
6,400.00 kJ/mol  
99+
12th Energy Level
7,600.00 kJ/mol  
99+
60,100.00 kJ/mol  
16
13th Energy Level
7,600.00 kJ/mol  
23
6,350.00 kJ/mol  
37
14th Energy Level
7,600.00 kJ/mol  
20
1,150.00 kJ/mol  
99+
15th Energy Level
76,000.00 kJ/mol  
20
63,500.00 kJ/mol  
37
16th Energy Level
76,000.00 kJ/mol  
15
635.00 kJ/mol  
99+
17th Energy Level
760.10 kJ/mol  
36
1,107.00 kJ/mol  
21
18th Energy Level
7,600.00 kJ/mol  
26
6,350.00 kJ/mol  
39
19th Energy Level
760.40 kJ/mol  
33
635.00 kJ/mol  
99+
20th Energy Level
760.00 kJ/mol  
27
635.00 kJ/mol  
40
21st Energy Level
760.00 kJ/mol  
99+
6,350.00 kJ/mol  
13
22nd Energy Level
760.00 kJ/mol  
21
635.00 kJ/mol  
34
23rd Energy Level
760.00 kJ/mol  
99+
6,350.00 kJ/mol  
13
24th Energy Level
760.00 kJ/mol  
18
635.00 kJ/mol  
36
25th Energy Level
760.00 kJ/mol  
18
635.00 kJ/mol  
38
26th Energy Level
760.00 kJ/mol  
18
635.00 kJ/mol  
37
27th Energy Level
760.00 kJ/mol  
17
635.00 kJ/mol  
39
28th Energy Level
760.00 kJ/mol  
23
635.00 kJ/mol  
99+
29th Energy Level
760.00 kJ/mol  
24
635.00 kJ/mol  
99+
30th Energy Level
760.00 kJ/mol  
18
635.00 kJ/mol  
40
Electrochemical Equivalent
0.99 g/amp-hr  
99+
3.21 g/amp-hr  
13
Electron Work Function
4.96 eV  
11
3.89 eV  
37
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
75  
99+
101  
17
Electron Configuration
[Xe] 4f14 5d5 6s2  
[Rn] 5f13 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Not Known  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
75  
40
101  
17
Number of Neutrons
111  
27
157  
8
Number of Electrons
75  
40
101  
17
Radius of an Atom
  
  
Atomic Radius
137.00 pm  
99+
175.00 pm  
21
Covalent Radius
151.00 pm  
36
175.00 pm  
25
Van der Waals Radius
200.00 pm  
35
246.00 pm  
12
Atomic Weight
186.21 amu  
36
258.00 amu  
14
Atomic Volume
8.85 cm3/mol  
99+
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Tungsten
  
Fermium
  
Next Element
Osmium
  
Nobelium
  
Valence Electron Potential
180.00 (-eV)  
3
63.70 (-eV)  
23
Lattice Constant
276.10 pm  
99+
-  
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.62  
17
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
21.02 g/cm3  
12
10.30 g/cm3  
38
Density When Liquid (at m.p.)
18.90 g/cm3  
14
10.30 g/cm3  
39
Tensile Strength
1,070.00 MPa  
3
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)  
40
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
178.00 GPa  
3
32.00 GPa  
24
Bulk Modulus
370.00 GPa  
2
0.00 GPa  
99+
Young's Modulus
463.00 GPa  
2
12.00 GPa  
99+
Poisson Ratio
0.30  
14
0.30  
14
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
21.02  
14
13.50  
29
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
8
0.00 H/m  
11
Susceptibility
0.00  
26
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
193.00 nΩ·m  
20
0.63 nΩ·m  
99+
Electrical Conductivity
0.05 106/cm Ω  
38
0.00 106/cm Ω  
99+
Electron Affinity
14.50 kJ/mol  
99+
50.00 kJ/mol  
26
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.10 J/(kg K)  
99+
Molar Heat Capacity
25.48 J/mol·K  
99+
27.00 J/mol·K  
29
Thermal Conductivity
48.00 W/m·K  
31
0.00 W/m·K  
99+
Critical Temperature
3,459.00 K  
2
1,100.00 K  
99+
Thermal Expansion
6.20 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
707.10 kJ/mol  
4
380.50 kJ/mol  
26
Enthalpy of Fusion
33.05 kJ/mol  
2
-  
Enthalpy of Atomization
791.00 kJ/mol  
2
410.80 kJ/mol  
25
Standard Molar Entropy
36.90 J/mol.K  
99+
37.40 J/mol.K  
99+
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