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Silver vs Iridium

Silver
Iridium
Iridium vs Silver


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