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Iridium vs Silver

Iridium
Silver
Silver vs Iridium


Periodic Table
Symbol
Ir  
Ag  
Group Number
9  
9
11  
7
Period Number
6  
5  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7439885  
99+
7440224  
99+
Space Group Name
Fm_ 3m  
Fm_ 3m  
Space Group Number
225.00  
3
225.00  
3
Facts
Interesting Facts
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
  • It is the most reflective element.
  • Silver is the second most ductile metal after Gold.
  • It is also used in Dentistry as a dental alloys for clips and crowning.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Earth's crust, Found in Minerals, Ores of metals  
History
  
  
Who Discovered
Smithson Tennant  
-  
Discovery
In 1803  
Before 5000 BC  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
27
Abundance In Sun
0.00 %  
25
0.00 %  
26
Abundance In Meteorites
0.00 %  
29
0.00 %  
38
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
0.00 %  
19
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.
  
  • Silver is mainly used for Jewelry and show piece.
  • It is used for manufacturing high quality mirrors due to its reflectivity property.
  
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry  
Chemical Industry, Clothing Industry, Electrical Industry  
Medical Uses
-  
Dentistry, Pharmaceutical Industry  
Other Uses
Alloys  
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues  
Biological Properties
  
  
Toxicity
Toxic  
Non Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
29
In Bone
0.00 p.p.m.  
99+
0.44 p.p.m.  
24
Physical
Melting Point
2,410.00 °C  
7
961.93 °C  
99+
Boiling Point
4,527.00 °C  
10
2,212.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.50  
5
2.50  
15
Brinell Hardness
1,670.00 MPa  
5
251.00 MPa  
99+
Vickers Hardness
1,760.00 MPa  
8
229.00 MPa  
99+
Speed of Sound
4,825.00 m/s  
17
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.40  
7
0.16  
99+
Reflectivity
78.00 %  
8
97.00 %  
1
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ir  
Ag  
Isotopes
  
  
Known Isotopes
34  
5
36  
3
Electronegativity
  
  
Pauling Electronegativity
2.20  
5
1.93  
10
Sanderson Electronegativity
2.20  
8
1.83  
14
Allred Rochow Electronegativity
1.55  
12
1.42  
19
Mulliken-Jaffe Electronegativity
2.20  
6
1.47  
28
Allen Electronegativity
1.68  
20
1.87  
10
Electropositivity
  
  
Pauling Electropositivity
1.80  
99+
2.07  
99+
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol  
9
731.00 kJ/mol  
27
2nd Energy Level
1,600.00 kJ/mol  
36
2,070.00 kJ/mol  
11
3rd Energy Level
2,256.10 kJ/mol  
99+
3,361.00 kJ/mol  
19
4th Energy Level
880.00 kJ/mol  
99+
7,310.00 kJ/mol  
10
5th Energy Level
8,800.00 kJ/mol  
8
7,310.00 kJ/mol  
24
6th Energy Level
8,800.00 kJ/mol  
25
7,310.00 kJ/mol  
39
7th Energy level
8,800.00 kJ/mol  
22
7,310.00 kJ/mol  
33
8th Energy Level
8,800.00 kJ/mol  
22
7,310.00 kJ/mol  
31
9th Energy Level
8,800.00 kJ/mol  
21
7,310.00 kJ/mol  
27
10th Energy Level
8,800.00 kJ/mol  
23
7,310.00 kJ/mol  
32
11th Energy Level
8,800.00 kJ/mol  
20
7,310.00 kJ/mol  
31
12th Energy Level
8,800.00 kJ/mol  
40
7,310.00 kJ/mol  
99+
13th Energy Level
8,800.00 kJ/mol  
15
7,310.00 kJ/mol  
25
14th Energy Level
8,800.00 kJ/mol  
14
731.00 kJ/mol  
99+
15th Energy Level
88,000.00 kJ/mol  
8
73,100.00 kJ/mol  
22
16th Energy Level
88,000.00 kJ/mol  
9
73,100.00 kJ/mol  
17
17th Energy Level
880.00 kJ/mol  
26
731.00 kJ/mol  
38
18th Energy Level
8,800.00 kJ/mol  
15
7,310.00 kJ/mol  
28
19th Energy Level
880.00 kJ/mol  
24
731.00 kJ/mol  
35
20th Energy Level
880.00 kJ/mol  
14
731.00 kJ/mol  
29
21st Energy Level
880.00 kJ/mol  
37
731.00 kJ/mol  
99+
22nd Energy Level
880.00 kJ/mol  
12
731.00 kJ/mol  
23
23rd Energy Level
8,800.00 kJ/mol  
7
731.00 kJ/mol  
99+
24th Energy Level
880.00 kJ/mol  
8
731.00 kJ/mol  
22
25th Energy Level
880.00 kJ/mol  
6
731.00 kJ/mol  
22
26th Energy Level
880.00 kJ/mol  
6
731.00 kJ/mol  
22
27th Energy Level
880.00 kJ/mol  
5
731.00 kJ/mol  
21
28th Energy Level
880.00 kJ/mol  
8
731.00 kJ/mol  
27
29th Energy Level
880.00 kJ/mol  
9
731.00 kJ/mol  
28
30th Energy Level
880.00 kJ/mol  
6
731.00 kJ/mol  
22
Electrochemical Equivalent
1.14 g/amp-hr  
99+
4.02 g/amp-hr  
7
Electron Work Function
4.55 eV  
18
4.26 eV  
27
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity  
Chemical Stability, Ionization, Solubility  
Atomic
Atomic Number
77  
39
47  
99+
Electron Configuration
[Xe] 4f14 5d7 6s2  
[Kr] 4d10 5s1  
Crystal Structure
Face Centered Cubic (FCC)  
Face Centered Cubic (FCC)  
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100  
FCC-Crystal-Structure-of-Silver.jpg#100  
Atom
  
  
Number of Protons
74  
99+
47  
99+
Number of Neutrons
110  
28
61  
99+
Number of Electrons
74  
99+
47  
99+
Radius of an Atom
  
  
Atomic Radius
136.00 pm  
99+
144.00 pm  
38
Covalent Radius
141.00 pm  
99+
145.00 pm  
99+
Van der Waals Radius
202.00 pm  
34
172.00 pm  
99+
Atomic Weight
192.22 amu  
34
107.87 amu  
99+
Atomic Volume
9.53 cm3/mol  
99+
10.30 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Osmium
  
Palladium
  
Next Element
Platinum
  
Cadmium
  
Valence Electron Potential
140.00 (-eV)  
5
11.40 (-eV)  
99+
Lattice Constant
383.90 pm  
29
408.53 pm  
23
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.58  
35
1.59  
26
Mechanical
Density
  
  
Density At Room Temperature
22.56 g/cm3  
10
10.49 g/cm3  
37
Density When Liquid (at m.p.)
19.00 g/cm3  
13
9.32 g/cm3  
99+
Tensile Strength
2,000.00 MPa  
2
170.00 MPa  
21
Viscosity
0.00  
21
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
14
Vapor Pressure at 2000 K
0.00 (Pa)  
26
0.00 (Pa)  
38
Elasticity properties
  
  
Shear Modulus
210.00 GPa  
2
30.00 GPa  
27
Bulk Modulus
320.00 GPa  
3
100.00 GPa  
16
Young's Modulus
528.00 GPa  
1
83.00 GPa  
25
Poisson Ratio
0.26  
22
0.37  
7
Other Mechanical Properties
-  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
21.78  
12
10.50  
39
Magnetic Ordering
Paramagnetic  
Diamagnetic  
Permeability
0.00 H/m  
16
0.00 H/m  
17
Susceptibility
0.00  
5
0.00  
32
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
47.10 nΩ·m  
99+
15.87 nΩ·m  
99+
Electrical Conductivity
0.19 106/cm Ω  
10
0.63 106/cm Ω  
1
Electron Affinity
151.00 kJ/mol  
4
125.60 kJ/mol  
5
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.24 J/(kg K)  
25
Molar Heat Capacity
25.10 J/mol·K  
99+
25.35 J/mol·K  
99+
Thermal Conductivity
147.00 W/m·K  
10
429.00 W/m·K  
1
Critical Temperature
2,719.00 K  
8
1,235.00 K  
99+
Thermal Expansion
6.40 µm/(m·K)  
99+
18.90 µm/(m·K)  
25
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol  
1
255.10 kJ/mol  
99+
Enthalpy of Fusion
35.23 kJ/mol  
1
11.30 kJ/mol  
37
Enthalpy of Atomization
837.00 kJ/mol  
1
284.50 kJ/mol  
99+
Standard Molar Entropy
35.50 J/mol.K  
99+
42.60 J/mol.K  
99+
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