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Holmium vs Silver

Holmium
Silver
Silver vs Holmium


Periodic Table
Symbol
Ho  
Ag  
Group Number
3  
15
11  
7
Period Number
6  
5  
Block
f block  
d block  
Element Family
Lanthanide  
Transition Metal  
CAS Number
7440600  
29
7440224  
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.
  
  • 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
Marc Delafontaine  
-  
Discovery
In 1878  
Before 5000 BC  
Abundance
  
  
Abundance In Universe
0.00 %  
28
0.00 %  
27
Abundance In Sun
-  
0.00 %  
26
Abundance In Meteorites
0.00 %  
99+
0.00 %  
38
Abundance In Earth's Crust
0.00 %  
38
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
0.00 %  
19
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.
  
  • Silver is mainly used for Jewelry and show piece.
  • It is used for manufacturing high quality mirrors due to its reflectivity property.
  
Industrial Uses
-  
Chemical Industry, Clothing Industry, Electrical Industry  
Medical Uses
-  
Dentistry, Pharmaceutical Industry  
Other Uses
Alloys, Nuclear Research  
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues  
Biological Properties
  
  
Toxicity
Low Toxic  
Non Toxic  
Present in Human Body
No  
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
1,461.00 °C  
30
961.93 °C  
99+
Boiling Point
2,600.00 °C  
99+
2,212.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
4.00  
11
2.50  
15
Brinell Hardness
746.00 MPa  
14
251.00 MPa  
99+
Vickers Hardness
481.00 MPa  
36
229.00 MPa  
99+
Speed of Sound
2,760.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.67  
29
0.16  
99+
Reflectivity
67.00 %  
16
97.00 %  
1
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ho  
Ag  
Isotopes
  
  
Known Isotopes
34  
5
36  
3
Electronegativity
  
  
Pauling Electronegativity
1.23  
38
1.93  
10
Sanderson Electronegativity
1.23  
30
1.83  
14
Allred Rochow Electronegativity
1.10  
31
1.42  
19
Mulliken-Jaffe Electronegativity
1.23  
37
1.47  
28
Allen Electronegativity
1.23  
99+
1.87  
10
Electropositivity
  
  
Pauling Electropositivity
2.77  
17
2.07  
99+
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol  
99+
731.00 kJ/mol  
27
2nd Energy Level
1,140.00 kJ/mol  
99+
2,070.00 kJ/mol  
11
3rd Energy Level
2,204.00 kJ/mol  
99+
3,361.00 kJ/mol  
19
4th Energy Level
4,100.00 kJ/mol  
99+
7,310.00 kJ/mol  
10
5th Energy Level
5,810.00 kJ/mol  
99+
7,310.00 kJ/mol  
24
6th Energy Level
5,810.00 kJ/mol  
99+
7,310.00 kJ/mol  
39
7th Energy level
5,810.00 kJ/mol  
99+
7,310.00 kJ/mol  
33
8th Energy Level
5,810.00 kJ/mol  
99+
7,310.00 kJ/mol  
31
9th Energy Level
6,500.00 kJ/mol  
39
7,310.00 kJ/mol  
27
10th Energy Level
6,500.00 kJ/mol  
99+
7,310.00 kJ/mol  
32
11th Energy Level
5,810.00 kJ/mol  
99+
7,310.00 kJ/mol  
31
12th Energy Level
5,810.00 kJ/mol  
99+
7,310.00 kJ/mol  
99+
13th Energy Level
5,810.00 kJ/mol  
99+
7,310.00 kJ/mol  
25
14th Energy Level
5,810.00 kJ/mol  
40
731.00 kJ/mol  
99+
15th Energy Level
58,100.00 kJ/mol  
99+
73,100.00 kJ/mol  
22
16th Energy Level
581.00 kJ/mol  
99+
73,100.00 kJ/mol  
17
17th Energy Level
581.00 kJ/mol  
99+
731.00 kJ/mol  
38
18th Energy Level
5,810.00 kJ/mol  
99+
7,310.00 kJ/mol  
28
19th Energy Level
581.00 kJ/mol  
99+
731.00 kJ/mol  
35
20th Energy Level
581.00 kJ/mol  
99+
731.00 kJ/mol  
29
21st Energy Level
581.00 kJ/mol  
99+
731.00 kJ/mol  
99+
22nd Energy Level
581.00 kJ/mol  
99+
731.00 kJ/mol  
23
23rd Energy Level
5,810.00 kJ/mol  
20
731.00 kJ/mol  
99+
24th Energy Level
581.00 kJ/mol  
99+
731.00 kJ/mol  
22
25th Energy Level
581.00 kJ/mol  
99+
731.00 kJ/mol  
22
26th Energy Level
581.00 kJ/mol  
99+
731.00 kJ/mol  
22
27th Energy Level
584.70 kJ/mol  
99+
731.00 kJ/mol  
21
28th Energy Level
581.00 kJ/mol  
99+
731.00 kJ/mol  
27
29th Energy Level
584.70 kJ/mol  
99+
731.00 kJ/mol  
28
30th Energy Level
581.00 kJ/mol  
99+
731.00 kJ/mol  
22
Electrochemical Equivalent
2.02 g/amp-hr  
33
4.02 g/amp-hr  
7
Electron Work Function
4.90 eV  
12
4.26 eV  
27
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Chemical Stability, Ionization, Solubility  
Atomic
Atomic Number
67  
99+
47  
99+
Electron Configuration
[Xe] 4f11 6s2  
[Kr] 4d10 5s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Face Centered Cubic (FCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Holmium.jpg#100  
FCC-Crystal-Structure-of-Silver.jpg#100  
Atom
  
  
Number of Protons
67  
99+
47  
99+
Number of Neutrons
98  
35
61  
99+
Number of Electrons
67  
99+
47  
99+
Radius of an Atom
  
  
Atomic Radius
176.00 pm  
20
144.00 pm  
38
Covalent Radius
192.00 pm  
17
145.00 pm  
99+
Van der Waals Radius
216.00 pm  
30
172.00 pm  
99+
Atomic Weight
164.93 amu  
99+
107.87 amu  
99+
Atomic Volume
18.70 cm3/mol  
36
10.30 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Dysprosium
  
Palladium
  
Next Element
Erbium
  
Cadmium
  
Valence Electron Potential
47.90 (-eV)  
32
11.40 (-eV)  
99+
Lattice Constant
357.73 pm  
99+
408.53 pm  
23
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.57  
40
1.59  
26
Mechanical
Density
  
  
Density At Room Temperature
8.79 g/cm3  
99+
10.49 g/cm3  
37
Density When Liquid (at m.p.)
8.34 g/cm3  
99+
9.32 g/cm3  
99+
Tensile Strength
270.00 MPa  
17
170.00 MPa  
21
Viscosity
0.00  
25
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
17
0.00 (Pa)  
14
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
38
Elasticity properties
  
  
Shear Modulus
26.30 GPa  
35
30.00 GPa  
27
Bulk Modulus
40.20 GPa  
37
100.00 GPa  
16
Young's Modulus
64.80 GPa  
33
83.00 GPa  
25
Poisson Ratio
0.23  
29
0.37  
7
Other Mechanical Properties
Ductile, Malleable, Sectile  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
8.80  
99+
10.50  
39
Magnetic Ordering
Paramagnetic  
Diamagnetic  
Permeability
0.00 H/m  
7
0.00 H/m  
17
Susceptibility
0.00  
11
0.00  
32
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
814.00 nΩ·m  
4
15.87 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.63 106/cm Ω  
1
Electron Affinity
50.00 kJ/mol  
26
125.60 kJ/mol  
5
Thermal
Specific Heat
0.16 J/(kg K)  
36
0.24 J/(kg K)  
25
Molar Heat Capacity
27.15 J/mol·K  
25
25.35 J/mol·K  
99+
Thermal Conductivity
16.20 W/m·K  
99+
429.00 W/m·K  
1
Critical Temperature
1,747.00 K  
34
1,235.00 K  
99+
Thermal Expansion
11.20 µm/(m·K)  
99+
18.90 µm/(m·K)  
25
Enthalpy
  
  
Enthalpy of Vaporization
241.00 kJ/mol  
99+
255.10 kJ/mol  
99+
Enthalpy of Fusion
11.76 kJ/mol  
35
11.30 kJ/mol  
37
Enthalpy of Atomization
301.00 kJ/mol  
99+
284.50 kJ/mol  
99+
Standard Molar Entropy
75.30 J/mol.K  
8
42.60 J/mol.K  
99+
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