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Silver vs Hafnium

Silver
Hafnium
Hafnium vs Silver


Periodic Table
Symbol
Ag   
Hf   
Group Number
11   
7
4   
14
Period Number
5   
6   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440224   
99+
7440586   
30
Space Group Name
Fm_ 3m   
P63/mmc   
Space Group Number
225.00   
2
194.00   
5
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.
  
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
Sources
Earth's crust, Found in Minerals, Ores of metals   
By-product Zirconium Refining   
History
  
  
Who Discovered
Unknown   
Dirk Coster and George de Hevesy   
Discovery
Before 5000 BC   
In 1922   
Abundance
  
  
Abundance In Universe
6 * 10-8 %   
26
7 * 10-8 %   
25
Abundance In Sun
~0.0000001 %   
26
~0.0000001 %   
26
Abundance In Meteorites
0.00 %   
38
0.00 %   
37
Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
31
Abundance In Oceans
0.00 %   
19
0.00 %   
27
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.
  
  • It has an ability to absorb neutrons and hence it is used to make control rods in nuclear submarines. And this metal is also used in Plasma welding torches.
  • It alloys with iron, titanium and niobium are very useful.
  
Industrial Uses
Chemical Industry, Clothing Industry, Electrical Industry   
Ammunition Industry   
Medical Uses
Dentistry, Pharmaceutical Industry   
NA   
Other Uses
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues   
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Non Toxic   
Toxic   
Present in Human Body
Yes   
No   
In Blood
0.00 Blood/mg dm-3   
29
Not Available   
In Bone
0.44 p.p.m.   
20
Not Available   
Physical Properties
Melting Point
961.93 °C   
99+
2,150.00 °C   
10
Boiling Point
2,212.00 °C   
99+
5,400.00 °C   
5
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Gray   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
2.50   
14
5.50   
7
Brinell Hardness
251.00 MPa   
37
1,450.00 MPa   
6
Vickers Hardness
229.00 MPa   
30
1,520.00 MPa   
5
Speed of Sound
2,680.00 m/s   
34
3,010.00 m/s   
27
Optical Properties
  
  
Reflectivity
97.00 %   
1
Not Available   
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
Ag   
Hf   
Isotopes
  
  
Known Isotopes
36   
3
32   
7
Electronegativity
  
  
Pauling Electronegativity
1.93   
9
1.30   
32
Sanderson Electronegativity
1.83   
11
Not Available   
Allred Rochow Electronegativity
1.42   
18
1.23   
25
Mulliken-Jaffe Electronegativity
1.47   
15
Not Available   
Allen Electronegativity
1.87   
7
1.16   
37
Electropositivity
  
  
Pauling Electropositivity
2.07   
99+
2.70   
22
Ionization Energies
  
  
1st Energy Level
731.00 kJ/mol   
27
658.50 kJ/mol   
40
2nd Energy Level
2,070.00 kJ/mol   
11
1,440.00 kJ/mol   
99+
3rd Energy Level
3,361.00 kJ/mol   
19
2,250.00 kJ/mol   
99+
4th Energy Level
Not Available   
3,216.00 kJ/mol   
99+
Electrochemical Equivalent
4.02 g/amp-hr   
7
1.66 g/amp-hr   
99+
Electron Work Function
4.26 eV   
20
3.90 eV   
27
Other Chemical Properties
Chemical Stability, Ionization, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
47   
99+
72   
99+
Electron Configuration
[Kr] 4d10 5s1   
[Xe] 4f14 5d2 6s2   
Crystal Structure
Face Centered Cubic (FCC)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
FCC-Crystal-Structure-of-Silver.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
47   
99+
72   
99+
Number of Neutrons
61   
99+
106   
29
Number of Electrons
47   
99+
72   
99+
Radius of an Atom
  
  
Atomic Radius
144.00 pm   
36
159.00 pm   
28
Covalent Radius
145.00 pm   
39
175.00 pm   
23
Van der Waals Radius
172.00 pm   
38
200.00 pm   
28
Atomic Weight
107.87 amu   
99+
178.49 amu   
39
Atomic Volume
10.30 cm3/mol   
99+
13.60 cm3/mol   
38
Adjacent Atomic Numbers
  
  
Previous Element
Palladium
  
Lutetium
  
Next Element
Cadmium
  
Tantalum
  
Valence Electron Potential
11.40 (-eV)   
99+
81.00 (-eV)   
16
Lattice Constant
408.53 pm   
20
319.64 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.58   
12
Mechanical Properties
Density
  
  
Density At Room Temperature
10.49 g/cm3   
35
13.31 g/cm3   
26
Density When Liquid (at m.p.)
9.32 g/cm3   
21
12.00 g/cm3   
12
Tensile Strength
Not Available   
445.00 MPa   
8
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
14
Not Available   
Vapor Pressure at 2000 K
Not Available   
0.00 (Pa)   
24
Elasticity properties
  
  
Shear Modulus
30.00 GPa   
23
30.00 GPa   
23
Bulk Modulus
100.00 GPa   
16
110.00 GPa   
15
Young's Modulus
83.00 GPa   
23
78.00 GPa   
25
Poisson Ratio
0.37   
7
0.37   
7
Other Mechanical Properties
Ductile, Malleable   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
10.50   
26
13.31   
18
Magnetic Ordering
Diamagnetic   
Paramagnetic   
Susceptibility
0.00   
5
Not Available   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
15.87 nΩ·m   
99+
331.00 nΩ·m   
14
Electrical Conductivity
0.63 106/cm Ω   
1
0.03 106/cm Ω   
39
Electron Affinity
125.60 kJ/mol   
5
0.00 kJ/mol   
40
Thermal Properties
Specific Heat
0.24 J/(kg K)   
25
0.14 J/(kg K)   
37
Molar Heat Capacity
25.35 J/mol·K   
99+
25.73 J/mol·K   
36
Thermal Conductivity
429.00 W/m·K   
1
23.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
18.90 µm/(m·K)   
23
5.90 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
255.10 kJ/mol   
37
661.10 kJ/mol   
5
Enthalpy of Fusion
11.30 kJ/mol   
31
25.10 kJ/mol   
8
Enthalpy of Atomization
284.50 kJ/mol   
37
703.00 kJ/mol   
5
Standard Molar Entropy
42.60 J/mol.K   
35
43.60 J/mol.K   
34
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