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Holmium vs Platinum

Holmium
Platinum
Platinum vs Holmium


Periodic Table
Symbol
Ho  
Pt  
Group Number
3  
15
10  
8
Period Number
6  
6  
Block
f block  
d block  
Element Family
Lanthanide  
Transition Metal  
CAS Number
7440600  
29
7440064  
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.
  
  • Platinum is the rarest metal from the Precious metal categories..
  • Commercially Platinum is produced as a byproduct in ores of nickel.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Mining, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
Marc Delafontaine  
Antonio de Ulloa  
Discovery
In 1878  
In 1735  
Abundance
  
  
Abundance In Universe
0.00 %  
28
0.00 %  
20
Abundance In Sun
-  
0.00 %  
19
Abundance In Meteorites
0.00 %  
99+
0.00 %  
25
Abundance In Earth's Crust
0.00 %  
38
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
-  
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.
  
  • Platinum metal is mainly used in jewellery.
  • Platinum is used as an industrial catalyst in production of nitric acid, silicone and benzene.
  
Industrial Uses
-  
Aerospace Industry, Chemical Industry  
Medical Uses
-  
Dentistry, Pharmaceutical Industry, Surgical Instruments Manufacturing  
Other Uses
Alloys, Nuclear Research  
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues  
Biological Properties
  
  
Toxicity
Low Toxic  
Non Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
37
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,461.00 °C  
30
1,772.00 °C  
16
Boiling Point
2,600.00 °C  
99+
3,827.00 °C  
15
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
4.00  
11
3.50  
12
Brinell Hardness
746.00 MPa  
14
300.00 MPa  
99+
Vickers Hardness
481.00 MPa  
36
400.00 MPa  
99+
Speed of Sound
2,760.00 m/s  
99+
2,800.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.67  
29
2.41  
6
Reflectivity
67.00 %  
16
73.00 %  
10
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ho  
Pt  
Isotopes
  
  
Known Isotopes
34  
5
35  
4
Electronegativity
  
  
Pauling Electronegativity
1.23  
38
2.28  
4
Sanderson Electronegativity
1.23  
30
2.28  
5
Allred Rochow Electronegativity
1.10  
31
1.44  
18
Mulliken-Jaffe Electronegativity
1.23  
37
2.20  
6
Allen Electronegativity
1.23  
99+
1.72  
19
Electropositivity
  
  
Pauling Electropositivity
2.77  
17
1.72  
99+
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol  
99+
870.00 kJ/mol  
10
2nd Energy Level
1,140.00 kJ/mol  
99+
1,791.00 kJ/mol  
22
3rd Energy Level
2,204.00 kJ/mol  
99+
2,277.00 kJ/mol  
99+
4th Energy Level
4,100.00 kJ/mol  
99+
8,702.00 kJ/mol  
6
5th Energy Level
5,810.00 kJ/mol  
99+
8,702.00 kJ/mol  
9
6th Energy Level
5,810.00 kJ/mol  
99+
8,700.00 kJ/mol  
27
7th Energy level
5,810.00 kJ/mol  
99+
8,700.00 kJ/mol  
23
8th Energy Level
5,810.00 kJ/mol  
99+
8,700.00 kJ/mol  
23
9th Energy Level
6,500.00 kJ/mol  
39
5,660.00 kJ/mol  
99+
10th Energy Level
6,500.00 kJ/mol  
99+
8,700.00 kJ/mol  
24
11th Energy Level
5,810.00 kJ/mol  
99+
8,700.00 kJ/mol  
21
12th Energy Level
5,810.00 kJ/mol  
99+
8,700.00 kJ/mol  
99+
13th Energy Level
5,810.00 kJ/mol  
99+
8,700.00 kJ/mol  
16
14th Energy Level
5,810.00 kJ/mol  
40
870.00 kJ/mol  
99+
15th Energy Level
58,100.00 kJ/mol  
99+
87,000.00 kJ/mol  
9
16th Energy Level
581.00 kJ/mol  
99+
870.00 kJ/mol  
99+
17th Energy Level
581.00 kJ/mol  
99+
870.00 kJ/mol  
27
18th Energy Level
5,810.00 kJ/mol  
99+
8,700.00 kJ/mol  
16
19th Energy Level
581.00 kJ/mol  
99+
870.00 kJ/mol  
25
20th Energy Level
581.00 kJ/mol  
99+
870.00 kJ/mol  
15
21st Energy Level
581.00 kJ/mol  
99+
870.00 kJ/mol  
38
22nd Energy Level
581.00 kJ/mol  
99+
870.00 kJ/mol  
13
23rd Energy Level
5,810.00 kJ/mol  
20
870.10 kJ/mol  
39
24th Energy Level
581.00 kJ/mol  
99+
870.00 kJ/mol  
9
25th Energy Level
581.00 kJ/mol  
99+
870.00 kJ/mol  
7
26th Energy Level
581.00 kJ/mol  
99+
870.00 kJ/mol  
7
27th Energy Level
584.70 kJ/mol  
99+
870.10 kJ/mol  
6
28th Energy Level
581.00 kJ/mol  
99+
870.10 kJ/mol  
9
29th Energy Level
584.70 kJ/mol  
99+
870.00 kJ/mol  
10
30th Energy Level
581.00 kJ/mol  
99+
870.00 kJ/mol  
7
Electrochemical Equivalent
2.02 g/amp-hr  
33
1.82 g/amp-hr  
39
Electron Work Function
4.90 eV  
12
5.65 eV  
4
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Chemical Stability, Anti Corrosion, Ionization  
Atomic
Atomic Number
67  
99+
78  
38
Electron Configuration
[Xe] 4f11 6s2  
[Xe] 4f14 5d9 6s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Face Centered Cubic (FCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Holmium.jpg#100  
FCC-Crystal-Structure-of-Platinum.jpg#100  
Atom
  
  
Number of Protons
67  
99+
78  
38
Number of Neutrons
98  
35
117  
25
Number of Electrons
67  
99+
78  
38
Radius of an Atom
  
  
Atomic Radius
176.00 pm  
20
139.00 pm  
99+
Covalent Radius
192.00 pm  
17
136.00 pm  
99+
Van der Waals Radius
216.00 pm  
30
175.00 pm  
99+
Atomic Weight
164.93 amu  
99+
47.87 amu  
99+
Atomic Volume
18.70 cm3/mol  
36
9.09 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Dysprosium
  
Iridium
  
Next Element
Erbium
  
Gold
  
Valence Electron Potential
47.90 (-eV)  
32
392.42 (-eV)  
1
Lattice Constant
357.73 pm  
99+
392.42 pm  
27
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.57  
40
1.56  
99+
Mechanical
Density
  
  
Density At Room Temperature
8.79 g/cm3  
99+
21.45 g/cm3  
11
Density When Liquid (at m.p.)
8.34 g/cm3  
99+
19.77 g/cm3  
12
Tensile Strength
270.00 MPa  
17
125.00 MPa  
26
Viscosity
0.00  
25
0.00  
16
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
17
0.00 (Pa)  
16
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.07 (Pa)  
18
Elasticity properties
  
  
Shear Modulus
26.30 GPa  
35
61.00 GPa  
14
Bulk Modulus
40.20 GPa  
37
230.00 GPa  
6
Young's Modulus
64.80 GPa  
33
168.00 GPa  
15
Poisson Ratio
0.23  
29
0.38  
6
Other Mechanical Properties
Ductile, Malleable, Sectile  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
8.80  
99+
21.45  
13
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
7
0.00 H/m  
14
Susceptibility
0.00  
11
0.00  
20
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
814.00 nΩ·m  
4
105.00 nΩ·m  
30
Electrical Conductivity
0.01 106/cm Ω  
99+
0.10 106/cm Ω  
26
Electron Affinity
50.00 kJ/mol  
26
205.30 kJ/mol  
2
Thermal
Specific Heat
0.16 J/(kg K)  
36
0.13 J/(kg K)  
40
Molar Heat Capacity
27.15 J/mol·K  
25
25.86 J/mol·K  
99+
Thermal Conductivity
16.20 W/m·K  
99+
71.60 W/m·K  
24
Critical Temperature
1,747.00 K  
34
2,041.00 K  
19
Thermal Expansion
11.20 µm/(m·K)  
99+
8.80 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
241.00 kJ/mol  
99+
510.50 kJ/mol  
15
Enthalpy of Fusion
11.76 kJ/mol  
35
19.70 kJ/mol  
12
Enthalpy of Atomization
301.00 kJ/mol  
99+
565.00 kJ/mol  
15
Standard Molar Entropy
75.30 J/mol.K  
8
41.60 J/mol.K  
99+
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