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Mendelevium vs Iridium

Mendelevium
Iridium
Iridium vs Mendelevium


Periodic Table
Symbol
Md  
Ir  
Group Number
3  
15
9  
9
Period Number
7  
6  
Block
f block  
d block  
Element Family
Actinide  
Transition Metal  
CAS Number
7440111  
99+
7439885  
99+
Space Group Name
-  
Fm_ 3m  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
Sources
Bombarding Einsteinium with Helium Ions  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory  
Smithson Tennant  
Discovery
In 1955  
In 1803  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
23
Abundance In Sun
-  
0.00 %  
25
Abundance In Meteorites
0.00 %  
99+
0.00 %  
29
Abundance In Earth's Crust
-  
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
  • Iridium has an anti corrosion properties and it is used in special alloy with Osmium metal and that alloy is used in pen tips and compass bearings.
  
Industrial Uses
-  
Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
-  
Alloys  
Biological Properties
  
  
Toxicity
-  
Toxic  
Present in Human Body
No  
Yes  
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+
2,410.00 °C  
7
Boiling Point
0.00 °C  
99+
4,527.00 °C  
10
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
-  
6.50  
5
Brinell Hardness
350.00 MPa  
36
1,670.00 MPa  
5
Vickers Hardness
0.00 MPa  
99+
1,760.00 MPa  
8
Speed of Sound
2,680.00 m/s  
99+
4,825.00 m/s  
17
Optical Properties
  
  
Refractive Index
1.30  
99+
2.40  
7
Reflectivity
66.00 %  
17
78.00 %  
8
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Md  
Ir  
Isotopes
  
  
Known Isotopes
16  
23
34  
5
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
2.20  
5
Sanderson Electronegativity
1.30  
25
2.20  
8
Allred Rochow Electronegativity
1.20  
28
1.55  
12
Mulliken-Jaffe Electronegativity
1.30  
33
2.20  
6
Allen Electronegativity
1.30  
40
1.68  
20
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
1.80  
99+
Ionization Energies
  
  
1st Energy Level
635.00 kJ/mol  
99+
880.00 kJ/mol  
9
2nd Energy Level
1,235.00 kJ/mol  
99+
1,600.00 kJ/mol  
36
3rd Energy Level
2,470.00 kJ/mol  
99+
2,256.10 kJ/mol  
99+
4th Energy Level
3,840.00 kJ/mol  
99+
880.00 kJ/mol  
99+
5th Energy Level
6,350.00 kJ/mol  
36
8,800.00 kJ/mol  
8
6th Energy Level
6,350.00 kJ/mol  
99+
8,800.00 kJ/mol  
25
7th Energy level
6,350.00 kJ/mol  
99+
8,800.00 kJ/mol  
22
8th Energy Level
6,350.00 kJ/mol  
99+
8,800.00 kJ/mol  
22
9th Energy Level
6,350.00 kJ/mol  
99+
8,800.00 kJ/mol  
21
10th Energy Level
6,350.00 kJ/mol  
99+
8,800.00 kJ/mol  
23
11th Energy Level
6,400.00 kJ/mol  
99+
8,800.00 kJ/mol  
20
12th Energy Level
60,100.00 kJ/mol  
16
8,800.00 kJ/mol  
40
13th Energy Level
6,350.00 kJ/mol  
37
8,800.00 kJ/mol  
15
14th Energy Level
1,150.00 kJ/mol  
99+
8,800.00 kJ/mol  
14
15th Energy Level
63,500.00 kJ/mol  
37
88,000.00 kJ/mol  
8
16th Energy Level
635.00 kJ/mol  
99+
88,000.00 kJ/mol  
9
17th Energy Level
1,107.00 kJ/mol  
21
880.00 kJ/mol  
26
18th Energy Level
6,350.00 kJ/mol  
39
8,800.00 kJ/mol  
15
19th Energy Level
635.00 kJ/mol  
99+
880.00 kJ/mol  
24
20th Energy Level
635.00 kJ/mol  
40
880.00 kJ/mol  
14
21st Energy Level
6,350.00 kJ/mol  
13
880.00 kJ/mol  
37
22nd Energy Level
635.00 kJ/mol  
34
880.00 kJ/mol  
12
23rd Energy Level
6,350.00 kJ/mol  
13
8,800.00 kJ/mol  
7
24th Energy Level
635.00 kJ/mol  
36
880.00 kJ/mol  
8
25th Energy Level
635.00 kJ/mol  
38
880.00 kJ/mol  
6
26th Energy Level
635.00 kJ/mol  
37
880.00 kJ/mol  
6
27th Energy Level
635.00 kJ/mol  
39
880.00 kJ/mol  
5
28th Energy Level
635.00 kJ/mol  
99+
880.00 kJ/mol  
8
29th Energy Level
635.00 kJ/mol  
99+
880.00 kJ/mol  
9
30th Energy Level
635.00 kJ/mol  
40
880.00 kJ/mol  
6
Electrochemical Equivalent
3.21 g/amp-hr  
13
1.14 g/amp-hr  
99+
Electron Work Function
3.89 eV  
37
4.55 eV  
18
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Flammable, Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
101  
17
77  
39
Electron Configuration
[Rn] 5f13 7s2  
[Xe] 4f14 5d7 6s2  
Crystal Structure
Not Known  
Face Centered Cubic (FCC)  
Crystal Lattice
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
FCC-Crystal-Structure-of-Iridium.jpg#100  
Atom
  
  
Number of Protons
101  
17
74  
99+
Number of Neutrons
157  
8
110  
28
Number of Electrons
101  
17
74  
99+
Radius of an Atom
  
  
Atomic Radius
175.00 pm  
21
136.00 pm  
99+
Covalent Radius
175.00 pm  
25
141.00 pm  
99+
Van der Waals Radius
246.00 pm  
12
202.00 pm  
34
Atomic Weight
258.00 amu  
14
192.22 amu  
34
Atomic Volume
19.90 cm3/mol  
32
9.53 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Fermium
  
Osmium
  
Next Element
Nobelium
  
Platinum
  
Valence Electron Potential
63.70 (-eV)  
23
140.00 (-eV)  
5
Lattice Constant
-  
383.90 pm  
29
Lattice Angles
-  
π/2, π/2, π/2  
Lattice C/A Ratio
1.58  
36
1.58  
35
Mechanical
Density
  
  
Density At Room Temperature
10.30 g/cm3  
38
22.56 g/cm3  
10
Density When Liquid (at m.p.)
10.30 g/cm3  
39
19.00 g/cm3  
13
Tensile Strength
80.00 MPa  
29
2,000.00 MPa  
2
Viscosity
0.00  
25
0.00  
21
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)  
26
Elasticity properties
  
  
Shear Modulus
32.00 GPa  
24
210.00 GPa  
2
Bulk Modulus
0.00 GPa  
99+
320.00 GPa  
3
Young's Modulus
12.00 GPa  
99+
528.00 GPa  
1
Poisson Ratio
0.30  
14
0.26  
22
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.50  
29
21.78  
12
Magnetic Ordering
-  
Paramagnetic  
Permeability
0.00 H/m  
11
0.00 H/m  
16
Susceptibility
0.00  
24
0.00  
5
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
0.63 nΩ·m  
99+
47.10 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.19 106/cm Ω  
10
Electron Affinity
50.00 kJ/mol  
26
151.00 kJ/mol  
4
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.13 J/(kg K)  
40
Molar Heat Capacity
27.00 J/mol·K  
29
25.10 J/mol·K  
99+
Thermal Conductivity
0.00 W/m·K  
99+
147.00 W/m·K  
10
Critical Temperature
1,100.00 K  
99+
2,719.00 K  
8
Thermal Expansion
11.60 µm/(m·K)  
99+
6.40 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
380.50 kJ/mol  
26
799.10 kJ/mol  
1
Enthalpy of Fusion
-  
35.23 kJ/mol  
1
Enthalpy of Atomization
410.80 kJ/mol  
25
837.00 kJ/mol  
1
Standard Molar Entropy
37.40 J/mol.K  
99+
35.50 J/mol.K  
99+
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