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Holmium vs Iridium

Holmium
Iridium
Iridium vs Holmium


Periodic Table
Symbol
Ho   
Ir   
Group Number
Not Available   
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   
5
225.00   
2
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
5 * 10-8 %   
27
2 * 10-7 %   
22
Abundance In Sun
~-9999 %   
~0.0000002 %   
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+
Not Available   
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
NA   
Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research   
Alloys   
Biological Properties
  
  
Toxicity
Low Toxic   
Toxic   
Present in Human Body
No   
Yes   
Physical Properties
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
Not Available   
6.50   
5
Brinell Hardness
746.00 MPa   
13
1,670.00 MPa   
5
Vickers Hardness
481.00 MPa   
23
1,760.00 MPa   
3
Speed of Sound
2,760.00 m/s   
30
4,825.00 m/s   
13
Optical Properties
  
  
Reflectivity
Not Available   
78.00 %   
6
Allotropes
No   
No   
α Allotropes
Not Available   
Not Available   
β Allotropes
Not Available   
Not Available   
γ Allotropes
Not Available   
Not Available   
Chemical Properties
Chemical Formula
Ho   
Ir   
Isotopes
  
  
Known Isotopes
34   
5
34   
5
Electronegativity
  
  
Pauling Electronegativity
1.23   
37
2.20   
4
Allred Rochow Electronegativity
1.10   
30
1.55   
11
Allen Electronegativity
Not Available   
1.68   
17
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   
35
3rd Energy Level
2,204.00 kJ/mol   
99+
Not Available   
4th Energy Level
4,100.00 kJ/mol   
34
Not Available   
Electrochemical Equivalent
2.02 g/amp-hr   
29
1.14 g/amp-hr   
99+
Electron Work Function
Not Available   
4.55 eV   
13
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Flammable, Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
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   
34
110   
27
Number of Electrons
67   
99+
74   
99+
Radius of an Atom
  
  
Atomic Radius
176.00 pm   
18
136.00 pm   
99+
Covalent Radius
192.00 pm   
17
141.00 pm   
99+
Van der Waals Radius
216.00 pm   
24
202.00 pm   
27
Atomic Weight
164.93 amu   
99+
192.22 amu   
34
Atomic Volume
18.70 cm3/mol   
24
9.53 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Dysprosium
  
Osmium
  
Next Element
Erbium
  
Platinum
  
Valence Electron Potential
47.90 (-eV)   
31
140.00 (-eV)   
5
Lattice Constant
357.73 pm   
38
383.90 pm   
26
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
1.57   
17
Not Available   
Mechanical Properties
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   
26
19.00 g/cm3   
3
Tensile Strength
Not Available   
2,000.00 MPa   
2
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
16
Not Available   
Vapor Pressure at 2000 K
Not Available   
0.00 (Pa)   
25
Elasticity properties
  
  
Shear Modulus
26.30 GPa   
28
210.00 GPa   
2
Bulk Modulus
40.20 GPa   
32
320.00 GPa   
3
Young's Modulus
64.80 GPa   
31
528.00 GPa   
1
Poisson Ratio
0.23   
29
0.26   
22
Other Mechanical Properties
Ductile, Malleable, Sectile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
8.80   
35
21.78   
3
Magnetic Ordering
Paramagnetic   
Paramagnetic   
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   
21
151.00 kJ/mol   
4
Thermal Properties
Specific Heat
0.16 J/(kg K)   
35
0.13 J/(kg K)   
39
Molar Heat Capacity
27.15 J/mol·K   
19
25.10 J/mol·K   
99+
Thermal Conductivity
16.20 W/m·K   
99+
147.00 W/m·K   
10
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
11.20 µm/(m·K)   
35
6.40 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
241.00 kJ/mol   
38
799.10 kJ/mol   
1
Enthalpy of Fusion
11.76 kJ/mol   
29
35.23 kJ/mol   
1
Enthalpy of Atomization
301.00 kJ/mol   
36
837.00 kJ/mol   
1
Standard Molar Entropy
75.30 J/mol.K   
8
35.50 J/mol.K   
99+
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