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Iridium vs Holmium

Iridium
Holmium
Holmium vs Iridium


Periodic Table
Symbol
Ir  
Ho  
Group Number
9  
9
3  
15
Period Number
6  
6  
Block
d block  
f block  
Element Family
Transition Metal  
Lanthanide  
CAS Number
7439885  
99+
7440600  
29
Space Group Name
Fm_ 3m  
P63/mmc  
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 .
  
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Smithson Tennant  
Marc Delafontaine  
Discovery
In 1803  
In 1878  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
28
Abundance In Sun
0.00 %  
25
-  
Abundance In Meteorites
0.00 %  
29
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
38
Abundance In Oceans
-  
0.00 %  
99+
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.
  
  • Holmium metal has an ability to absorb neutrons, so this metal is used in nuclear reactors to keep the chain reactions of elements under control.
  • Alloys of Holmium are used to produce Magnet.
  
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys, Nuclear Research  
Biological Properties
  
  
Toxicity
Toxic  
Low 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
1,461.00 °C  
30
Boiling Point
4,527.00 °C  
10
2,600.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.50  
5
4.00  
11
Brinell Hardness
1,670.00 MPa  
5
746.00 MPa  
14
Vickers Hardness
1,760.00 MPa  
8
481.00 MPa  
36
Speed of Sound
4,825.00 m/s  
17
2,760.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.40  
7
1.67  
29
Reflectivity
78.00 %  
8
67.00 %  
16
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ir  
Ho  
Isotopes
  
  
Known Isotopes
34  
5
34  
5
Electronegativity
  
  
Pauling Electronegativity
2.20  
5
1.23  
38
Sanderson Electronegativity
2.20  
8
1.23  
30
Allred Rochow Electronegativity
1.55  
12
1.10  
31
Mulliken-Jaffe Electronegativity
2.20  
6
1.23  
37
Allen Electronegativity
1.68  
20
1.23  
99+
Electropositivity
  
  
Pauling Electropositivity
1.80  
99+
2.77  
17
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol  
9
581.00 kJ/mol  
99+
2nd Energy Level
1,600.00 kJ/mol  
36
1,140.00 kJ/mol  
99+
3rd Energy Level
2,256.10 kJ/mol  
99+
2,204.00 kJ/mol  
99+
4th Energy Level
880.00 kJ/mol  
99+
4,100.00 kJ/mol  
99+
5th Energy Level
8,800.00 kJ/mol  
8
5,810.00 kJ/mol  
99+
6th Energy Level
8,800.00 kJ/mol  
25
5,810.00 kJ/mol  
99+
7th Energy level
8,800.00 kJ/mol  
22
5,810.00 kJ/mol  
99+
8th Energy Level
8,800.00 kJ/mol  
22
5,810.00 kJ/mol  
99+
9th Energy Level
8,800.00 kJ/mol  
21
6,500.00 kJ/mol  
39
10th Energy Level
8,800.00 kJ/mol  
23
6,500.00 kJ/mol  
99+
11th Energy Level
8,800.00 kJ/mol  
20
5,810.00 kJ/mol  
99+
12th Energy Level
8,800.00 kJ/mol  
40
5,810.00 kJ/mol  
99+
13th Energy Level
8,800.00 kJ/mol  
15
5,810.00 kJ/mol  
99+
14th Energy Level
8,800.00 kJ/mol  
14
5,810.00 kJ/mol  
40
15th Energy Level
88,000.00 kJ/mol  
8
58,100.00 kJ/mol  
99+
16th Energy Level
88,000.00 kJ/mol  
9
581.00 kJ/mol  
99+
17th Energy Level
880.00 kJ/mol  
26
581.00 kJ/mol  
99+
18th Energy Level
8,800.00 kJ/mol  
15
5,810.00 kJ/mol  
99+
19th Energy Level
880.00 kJ/mol  
24
581.00 kJ/mol  
99+
20th Energy Level
880.00 kJ/mol  
14
581.00 kJ/mol  
99+
21st Energy Level
880.00 kJ/mol  
37
581.00 kJ/mol  
99+
22nd Energy Level
880.00 kJ/mol  
12
581.00 kJ/mol  
99+
23rd Energy Level
8,800.00 kJ/mol  
7
5,810.00 kJ/mol  
20
24th Energy Level
880.00 kJ/mol  
8
581.00 kJ/mol  
99+
25th Energy Level
880.00 kJ/mol  
6
581.00 kJ/mol  
99+
26th Energy Level
880.00 kJ/mol  
6
581.00 kJ/mol  
99+
27th Energy Level
880.00 kJ/mol  
5
584.70 kJ/mol  
99+
28th Energy Level
880.00 kJ/mol  
8
581.00 kJ/mol  
99+
29th Energy Level
880.00 kJ/mol  
9
584.70 kJ/mol  
99+
30th Energy Level
880.00 kJ/mol  
6
581.00 kJ/mol  
99+
Electrochemical Equivalent
1.14 g/amp-hr  
99+
2.02 g/amp-hr  
33
Electron Work Function
4.55 eV  
18
4.90 eV  
12
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity  
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
77  
39
67  
99+
Electron Configuration
[Xe] 4f14 5d7 6s2  
[Xe] 4f11 6s2  
Crystal Structure
Face Centered Cubic (FCC)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100  
HCP-Crystal-Structure-of-Holmium.jpg#100  
Atom
  
  
Number of Protons
74  
99+
67  
99+
Number of Neutrons
110  
28
98  
35
Number of Electrons
74  
99+
67  
99+
Radius of an Atom
  
  
Atomic Radius
136.00 pm  
99+
176.00 pm  
20
Covalent Radius
141.00 pm  
99+
192.00 pm  
17
Van der Waals Radius
202.00 pm  
34
216.00 pm  
30
Atomic Weight
192.22 amu  
34
164.93 amu  
99+
Atomic Volume
9.53 cm3/mol  
99+
18.70 cm3/mol  
36
Adjacent Atomic Numbers
  
  
Previous Element
Osmium
  
Dysprosium
  
Next Element
Platinum
  
Erbium
  
Valence Electron Potential
140.00 (-eV)  
5
47.90 (-eV)  
32
Lattice Constant
383.90 pm  
29
357.73 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.58  
35
1.57  
40
Mechanical
Density
  
  
Density At Room Temperature
22.56 g/cm3  
10
8.79 g/cm3  
99+
Density When Liquid (at m.p.)
19.00 g/cm3  
13
8.34 g/cm3  
99+
Tensile Strength
2,000.00 MPa  
2
270.00 MPa  
17
Viscosity
0.00  
21
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
17
Vapor Pressure at 2000 K
0.00 (Pa)  
26
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
210.00 GPa  
2
26.30 GPa  
35
Bulk Modulus
320.00 GPa  
3
40.20 GPa  
37
Young's Modulus
528.00 GPa  
1
64.80 GPa  
33
Poisson Ratio
0.26  
22
0.23  
29
Other Mechanical Properties
-  
Ductile, Malleable, Sectile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
21.78  
12
8.80  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
16
0.00 H/m  
7
Susceptibility
0.00  
5
0.00  
11
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
47.10 nΩ·m  
99+
814.00 nΩ·m  
4
Electrical Conductivity
0.19 106/cm Ω  
10
0.01 106/cm Ω  
99+
Electron Affinity
151.00 kJ/mol  
4
50.00 kJ/mol  
26
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.16 J/(kg K)  
36
Molar Heat Capacity
25.10 J/mol·K  
99+
27.15 J/mol·K  
25
Thermal Conductivity
147.00 W/m·K  
10
16.20 W/m·K  
99+
Critical Temperature
2,719.00 K  
8
1,747.00 K  
34
Thermal Expansion
6.40 µm/(m·K)  
99+
11.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol  
1
241.00 kJ/mol  
99+
Enthalpy of Fusion
35.23 kJ/mol  
1
11.76 kJ/mol  
35
Enthalpy of Atomization
837.00 kJ/mol  
1
301.00 kJ/mol  
99+
Standard Molar Entropy
35.50 J/mol.K  
99+
75.30 J/mol.K  
8
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