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Holmium vs Iridium

Holmium
Iridium
Iridium vs Holmium


Periodic Table
Symbol
Ho  
Ir  
Group Number
3  
15
9  
9
Period Number
6  
6  
Block
f block  
d block  
Element Family
Lanthanide  
Transition Metal  
CAS Number
7440600  
29
7439885  
99+
Space Group Name
P63/mmc  
Fm_ 3m  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Marc Delafontaine  
Smithson Tennant  
Discovery
In 1878  
In 1803  
Abundance
  
  
Abundance In Universe
0.00 %  
28
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 %  
38
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • 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.
  
  • 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, Nuclear Research  
Alloys  
Biological Properties
  
  
Toxicity
Low Toxic  
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
1,461.00 °C  
30
2,410.00 °C  
7
Boiling Point
2,600.00 °C  
99+
4,527.00 °C  
10
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
4.00  
11
6.50  
5
Brinell Hardness
746.00 MPa  
14
1,670.00 MPa  
5
Vickers Hardness
481.00 MPa  
36
1,760.00 MPa  
8
Speed of Sound
2,760.00 m/s  
99+
4,825.00 m/s  
17
Optical Properties
  
  
Refractive Index
1.67  
29
2.40  
7
Reflectivity
67.00 %  
16
78.00 %  
8
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ho  
Ir  
Isotopes
  
  
Known Isotopes
34  
5
34  
5
Electronegativity
  
  
Pauling Electronegativity
1.23  
38
2.20  
5
Sanderson Electronegativity
1.23  
30
2.20  
8
Allred Rochow Electronegativity
1.10  
31
1.55  
12
Mulliken-Jaffe Electronegativity
1.23  
37
2.20  
6
Allen Electronegativity
1.23  
99+
1.68  
20
Electropositivity
  
  
Pauling Electropositivity
2.77  
17
1.80  
99+
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol  
99+
880.00 kJ/mol  
9
2nd Energy Level
1,140.00 kJ/mol  
99+
1,600.00 kJ/mol  
36
3rd Energy Level
2,204.00 kJ/mol  
99+
2,256.10 kJ/mol  
99+
4th Energy Level
4,100.00 kJ/mol  
99+
880.00 kJ/mol  
99+
5th Energy Level
5,810.00 kJ/mol  
99+
8,800.00 kJ/mol  
8
6th Energy Level
5,810.00 kJ/mol  
99+
8,800.00 kJ/mol  
25
7th Energy level
5,810.00 kJ/mol  
99+
8,800.00 kJ/mol  
22
8th Energy Level
5,810.00 kJ/mol  
99+
8,800.00 kJ/mol  
22
9th Energy Level
6,500.00 kJ/mol  
39
8,800.00 kJ/mol  
21
10th Energy Level
6,500.00 kJ/mol  
99+
8,800.00 kJ/mol  
23
11th Energy Level
5,810.00 kJ/mol  
99+
8,800.00 kJ/mol  
20
12th Energy Level
5,810.00 kJ/mol  
99+
8,800.00 kJ/mol  
40
13th Energy Level
5,810.00 kJ/mol  
99+
8,800.00 kJ/mol  
15
14th Energy Level
5,810.00 kJ/mol  
40
8,800.00 kJ/mol  
14
15th Energy Level
58,100.00 kJ/mol  
99+
88,000.00 kJ/mol  
8
16th Energy Level
581.00 kJ/mol  
99+
88,000.00 kJ/mol  
9
17th Energy Level
581.00 kJ/mol  
99+
880.00 kJ/mol  
26
18th Energy Level
5,810.00 kJ/mol  
99+
8,800.00 kJ/mol  
15
19th Energy Level
581.00 kJ/mol  
99+
880.00 kJ/mol  
24
20th Energy Level
581.00 kJ/mol  
99+
880.00 kJ/mol  
14
21st Energy Level
581.00 kJ/mol  
99+
880.00 kJ/mol  
37
22nd Energy Level
581.00 kJ/mol  
99+
880.00 kJ/mol  
12
23rd Energy Level
5,810.00 kJ/mol  
20
8,800.00 kJ/mol  
7
24th Energy Level
581.00 kJ/mol  
99+
880.00 kJ/mol  
8
25th Energy Level
581.00 kJ/mol  
99+
880.00 kJ/mol  
6
26th Energy Level
581.00 kJ/mol  
99+
880.00 kJ/mol  
6
27th Energy Level
584.70 kJ/mol  
99+
880.00 kJ/mol  
5
28th Energy Level
581.00 kJ/mol  
99+
880.00 kJ/mol  
8
29th Energy Level
584.70 kJ/mol  
99+
880.00 kJ/mol  
9
30th Energy Level
581.00 kJ/mol  
99+
880.00 kJ/mol  
6
Electrochemical Equivalent
2.02 g/amp-hr  
33
1.14 g/amp-hr  
99+
Electron Work Function
4.90 eV  
12
4.55 eV  
18
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Flammable, Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
67  
99+
77  
39
Electron Configuration
[Xe] 4f11 6s2  
[Xe] 4f14 5d7 6s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Face Centered Cubic (FCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Holmium.jpg#100  
FCC-Crystal-Structure-of-Iridium.jpg#100  
Atom
  
  
Number of Protons
67  
99+
74  
99+
Number of Neutrons
98  
35
110  
28
Number of Electrons
67  
99+
74  
99+
Radius of an Atom
  
  
Atomic Radius
176.00 pm  
20
136.00 pm  
99+
Covalent Radius
192.00 pm  
17
141.00 pm  
99+
Van der Waals Radius
216.00 pm  
30
202.00 pm  
34
Atomic Weight
164.93 amu  
99+
192.22 amu  
34
Atomic Volume
18.70 cm3/mol  
36
9.53 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Dysprosium
  
Osmium
  
Next Element
Erbium
  
Platinum
  
Valence Electron Potential
47.90 (-eV)  
32
140.00 (-eV)  
5
Lattice Constant
357.73 pm  
99+
383.90 pm  
29
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.57  
40
1.58  
35
Mechanical
Density
  
  
Density At Room Temperature
8.79 g/cm3  
99+
22.56 g/cm3  
10
Density When Liquid (at m.p.)
8.34 g/cm3  
99+
19.00 g/cm3  
13
Tensile Strength
270.00 MPa  
17
2,000.00 MPa  
2
Viscosity
0.00  
25
0.00  
21
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
17
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
26
Elasticity properties
  
  
Shear Modulus
26.30 GPa  
35
210.00 GPa  
2
Bulk Modulus
40.20 GPa  
37
320.00 GPa  
3
Young's Modulus
64.80 GPa  
33
528.00 GPa  
1
Poisson Ratio
0.23  
29
0.26  
22
Other Mechanical Properties
Ductile, Malleable, Sectile  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
8.80  
99+
21.78  
12
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
7
0.00 H/m  
16
Susceptibility
0.00  
11
0.00  
5
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
814.00 nΩ·m  
4
47.10 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.19 106/cm Ω  
10
Electron Affinity
50.00 kJ/mol  
26
151.00 kJ/mol  
4
Thermal
Specific Heat
0.16 J/(kg K)  
36
0.13 J/(kg K)  
40
Molar Heat Capacity
27.15 J/mol·K  
25
25.10 J/mol·K  
99+
Thermal Conductivity
16.20 W/m·K  
99+
147.00 W/m·K  
10
Critical Temperature
1,747.00 K  
34
2,719.00 K  
8
Thermal Expansion
11.20 µm/(m·K)  
99+
6.40 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
241.00 kJ/mol  
99+
799.10 kJ/mol  
1
Enthalpy of Fusion
11.76 kJ/mol  
35
35.23 kJ/mol  
1
Enthalpy of Atomization
301.00 kJ/mol  
99+
837.00 kJ/mol  
1
Standard Molar Entropy
75.30 J/mol.K  
8
35.50 J/mol.K  
99+
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