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Iridium vs Mendelevium

Iridium
Mendelevium
Mendelevium vs Iridium


Periodic Table
Symbol
Ir  
Md  
Group Number
9  
9
3  
15
Period Number
6  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7439885  
99+
7440111  
99+
Space Group Name
Fm_ 3m  
-  
Space Group Number
225.00  
3
194.00  
7
Facts
Interesting Facts
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
  • 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
Smithson Tennant  
Lawrence Berkeley National Laboratory  
Discovery
In 1803  
In 1955  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
40
Abundance In Sun
0.00 %  
25
-  
Abundance In Meteorites
0.00 %  
29
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
-  
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • 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.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Toxic  
-  
Present in Human Body
Yes  
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
2,410.00 °C  
7
827.00 °C  
99+
Boiling Point
4,527.00 °C  
10
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
-  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.50  
5
-  
Brinell Hardness
1,670.00 MPa  
5
350.00 MPa  
36
Vickers Hardness
1,760.00 MPa  
8
0.00 MPa  
99+
Speed of Sound
4,825.00 m/s  
17
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.40  
7
1.30  
99+
Reflectivity
78.00 %  
8
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ir  
Md  
Isotopes
  
  
Known Isotopes
34  
5
16  
23
Electronegativity
  
  
Pauling Electronegativity
2.20  
5
1.30  
33
Sanderson Electronegativity
2.20  
8
1.30  
25
Allred Rochow Electronegativity
1.55  
12
1.20  
28
Mulliken-Jaffe Electronegativity
2.20  
6
1.30  
33
Allen Electronegativity
1.68  
20
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
1.80  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol  
9
635.00 kJ/mol  
99+
2nd Energy Level
1,600.00 kJ/mol  
36
1,235.00 kJ/mol  
99+
3rd Energy Level
2,256.10 kJ/mol  
99+
2,470.00 kJ/mol  
99+
4th Energy Level
880.00 kJ/mol  
99+
3,840.00 kJ/mol  
99+
5th Energy Level
8,800.00 kJ/mol  
8
6,350.00 kJ/mol  
36
6th Energy Level
8,800.00 kJ/mol  
25
6,350.00 kJ/mol  
99+
7th Energy level
8,800.00 kJ/mol  
22
6,350.00 kJ/mol  
99+
8th Energy Level
8,800.00 kJ/mol  
22
6,350.00 kJ/mol  
99+
9th Energy Level
8,800.00 kJ/mol  
21
6,350.00 kJ/mol  
99+
10th Energy Level
8,800.00 kJ/mol  
23
6,350.00 kJ/mol  
99+
11th Energy Level
8,800.00 kJ/mol  
20
6,400.00 kJ/mol  
99+
12th Energy Level
8,800.00 kJ/mol  
40
60,100.00 kJ/mol  
16
13th Energy Level
8,800.00 kJ/mol  
15
6,350.00 kJ/mol  
37
14th Energy Level
8,800.00 kJ/mol  
14
1,150.00 kJ/mol  
99+
15th Energy Level
88,000.00 kJ/mol  
8
63,500.00 kJ/mol  
37
16th Energy Level
88,000.00 kJ/mol  
9
635.00 kJ/mol  
99+
17th Energy Level
880.00 kJ/mol  
26
1,107.00 kJ/mol  
21
18th Energy Level
8,800.00 kJ/mol  
15
6,350.00 kJ/mol  
39
19th Energy Level
880.00 kJ/mol  
24
635.00 kJ/mol  
99+
20th Energy Level
880.00 kJ/mol  
14
635.00 kJ/mol  
40
21st Energy Level
880.00 kJ/mol  
37
6,350.00 kJ/mol  
13
22nd Energy Level
880.00 kJ/mol  
12
635.00 kJ/mol  
34
23rd Energy Level
8,800.00 kJ/mol  
7
6,350.00 kJ/mol  
13
24th Energy Level
880.00 kJ/mol  
8
635.00 kJ/mol  
36
25th Energy Level
880.00 kJ/mol  
6
635.00 kJ/mol  
38
26th Energy Level
880.00 kJ/mol  
6
635.00 kJ/mol  
37
27th Energy Level
880.00 kJ/mol  
5
635.00 kJ/mol  
39
28th Energy Level
880.00 kJ/mol  
8
635.00 kJ/mol  
99+
29th Energy Level
880.00 kJ/mol  
9
635.00 kJ/mol  
99+
30th Energy Level
880.00 kJ/mol  
6
635.00 kJ/mol  
40
Electrochemical Equivalent
1.14 g/amp-hr  
99+
3.21 g/amp-hr  
13
Electron Work Function
4.55 eV  
18
3.89 eV  
37
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
77  
39
101  
17
Electron Configuration
[Xe] 4f14 5d7 6s2  
[Rn] 5f13 7s2  
Crystal Structure
Face Centered Cubic (FCC)  
Not Known  
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
74  
99+
101  
17
Number of Neutrons
110  
28
157  
8
Number of Electrons
74  
99+
101  
17
Radius of an Atom
  
  
Atomic Radius
136.00 pm  
99+
175.00 pm  
21
Covalent Radius
141.00 pm  
99+
175.00 pm  
25
Van der Waals Radius
202.00 pm  
34
246.00 pm  
12
Atomic Weight
192.22 amu  
34
258.00 amu  
14
Atomic Volume
9.53 cm3/mol  
99+
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Osmium
  
Fermium
  
Next Element
Platinum
  
Nobelium
  
Valence Electron Potential
140.00 (-eV)  
5
63.70 (-eV)  
23
Lattice Constant
383.90 pm  
29
-  
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.58  
35
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
22.56 g/cm3  
10
10.30 g/cm3  
38
Density When Liquid (at m.p.)
19.00 g/cm3  
13
10.30 g/cm3  
39
Tensile Strength
2,000.00 MPa  
2
80.00 MPa  
29
Viscosity
0.00  
21
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)  
26
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
210.00 GPa  
2
32.00 GPa  
24
Bulk Modulus
320.00 GPa  
3
0.00 GPa  
99+
Young's Modulus
528.00 GPa  
1
12.00 GPa  
99+
Poisson Ratio
0.26  
22
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
21.78  
12
13.50  
29
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
16
0.00 H/m  
11
Susceptibility
0.00  
5
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
47.10 nΩ·m  
99+
0.63 nΩ·m  
99+
Electrical Conductivity
0.19 106/cm Ω  
10
0.00 106/cm Ω  
99+
Electron Affinity
151.00 kJ/mol  
4
50.00 kJ/mol  
26
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.10 J/(kg K)  
99+
Molar Heat Capacity
25.10 J/mol·K  
99+
27.00 J/mol·K  
29
Thermal Conductivity
147.00 W/m·K  
10
0.00 W/m·K  
99+
Critical Temperature
2,719.00 K  
8
1,100.00 K  
99+
Thermal Expansion
6.40 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol  
1
380.50 kJ/mol  
26
Enthalpy of Fusion
35.23 kJ/mol  
1
-  
Enthalpy of Atomization
837.00 kJ/mol  
1
410.80 kJ/mol  
25
Standard Molar Entropy
35.50 J/mol.K  
99+
37.40 J/mol.K  
99+
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