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Rhenium vs Holmium

Rhenium
Holmium
Holmium vs Rhenium


Periodic Table
Symbol
Re  
Ho  
Group Number
7  
11
Not Available  
Period Number
6  
6  
Block
d block  
f block  
Element Family
Transition Metal  
Lanthanide  
CAS Number
7440155  
99+
7440600  
29
Space Group Name
P63/mmc  
P63/mmc  
Space Group Number
194.00  
5
194.00  
5
Facts
Interesting Facts
  • Chemical properties of Rhenium are similar to Manganese.
  • Rhenium metal is created while refining Molybdenum.
  
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Masataka Ogawa  
Marc Delafontaine  
Discovery
In 1908  
In 1878  
Abundance
  
  
Abundance In Universe
2 * 10-8 %  
29
5 * 10-8 %  
27
Abundance In Sun
~0.00000001 %  
29
~-9999 %  
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
38
Abundance In Oceans
0.00 %  
34
0.00 %  
99+
Uses
Uses & Benefits
  • Alloys of Rhenium are used as an electric contact material. It can resist withstand arc corrosion.
  • Its catalysts are used in hydrogenation of fine chemicals. Its Alloy with nickel is used to produce turbine blades.
  
  • 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.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
NA  
Medical Uses
NA  
NA  
Other Uses
Alloys  
Alloys, Nuclear Research  
Biological Properties
  
  
Toxicity
Low Toxic  
Low Toxic  
Present in Human Body
No  
No  
Physical Properties
Melting Point
3,180.00 °C  
2
1,461.00 °C  
30
Boiling Point
5,627.00 °C  
2
2,600.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Gray  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
7.00  
3
Not Available  
Brinell Hardness
1,320.00 MPa  
8
746.00 MPa  
13
Vickers Hardness
1,350.00 MPa  
7
481.00 MPa  
23
Speed of Sound
4,700.00 m/s  
15
2,760.00 m/s  
30
Optical Properties
  
  
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
Re  
Ho  
Isotopes
  
  
Known Isotopes
33  
6
34  
5
Electronegativity
  
  
Pauling Electronegativity
1.90  
11
1.23  
37
Allred Rochow Electronegativity
1.46  
15
1.10  
30
Allen Electronegativity
1.60  
21
Not Available  
Electropositivity
  
  
Pauling Electropositivity
2.10  
99+
2.77  
17
Ionization Energies
  
  
1st Energy Level
760.00 kJ/mol  
20
581.00 kJ/mol  
99+
2nd Energy Level
1,260.00 kJ/mol  
99+
1,140.00 kJ/mol  
99+
3rd Energy Level
2,510.00 kJ/mol  
99+
2,204.00 kJ/mol  
99+
4th Energy Level
3,640.00 kJ/mol  
99+
4,100.00 kJ/mol  
34
Electrochemical Equivalent
0.99 g/amp-hr  
99+
2.02 g/amp-hr  
29
Electron Work Function
4.96 eV  
7
Not Available  
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Solubility  
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic Properties
Atomic Number
75  
99+
67  
99+
Electron Configuration
[Xe] 4f14 5d5 6s2  
[Xe] 4f11 6s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
HCP-Crystal-Structure-of-Holmium.jpg#100  
Atom
  
  
Number of Protons
75  
40
67  
99+
Number of Neutrons
111  
26
98  
34
Number of Electrons
75  
40
67  
99+
Radius of an Atom
  
  
Atomic Radius
137.00 pm  
40
176.00 pm  
18
Covalent Radius
151.00 pm  
34
192.00 pm  
17
Van der Waals Radius
200.00 pm  
28
216.00 pm  
24
Atomic Weight
186.21 amu  
36
164.93 amu  
99+
Atomic Volume
8.85 cm3/mol  
99+
18.70 cm3/mol  
24
Adjacent Atomic Numbers
  
  
Previous Element
Tungsten
  
Dysprosium
  
Next Element
Osmium
  
Erbium
  
Valence Electron Potential
180.00 (-eV)  
3
47.90 (-eV)  
31
Lattice Constant
276.10 pm  
99+
357.73 pm  
38
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.62  
3
1.57  
17
Mechanical Properties
Density
  
  
Density At Room Temperature
21.02 g/cm3  
12
8.79 g/cm3  
99+
Density When Liquid (at m.p.)
18.90 g/cm3  
4
8.34 g/cm3  
26
Tensile Strength
1,070.00 MPa  
3
Not Available  
Viscosity
Not Available  
Not Available  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available  
0.00 (Pa)  
16
Vapor Pressure at 2000 K
0.00 (Pa)  
29
Not Available  
Elasticity properties
  
  
Shear Modulus
178.00 GPa  
3
26.30 GPa  
28
Bulk Modulus
370.00 GPa  
2
40.20 GPa  
32
Young's Modulus
463.00 GPa  
2
64.80 GPa  
31
Poisson Ratio
0.30  
14
0.23  
29
Other Mechanical Properties
Ductile, Malleable  
Ductile, Malleable, Sectile  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
21.02  
5
8.80  
35
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
193.00 nΩ·m  
20
814.00 nΩ·m  
4
Electrical Conductivity
0.05 106/cm Ω  
33
0.01 106/cm Ω  
99+
Electron Affinity
14.50 kJ/mol  
35
50.00 kJ/mol  
21
Thermal Properties
Specific Heat
0.13 J/(kg K)  
39
0.16 J/(kg K)  
35
Molar Heat Capacity
25.48 J/mol·K  
38
27.15 J/mol·K  
19
Thermal Conductivity
48.00 W/m·K  
31
16.20 W/m·K  
99+
Critical Temperature
Not Available  
Not Available  
Thermal Expansion
6.20 µm/(m·K)  
99+
11.20 µm/(m·K)  
35
Enthalpy
  
  
Enthalpy of Vaporization
707.10 kJ/mol  
3
241.00 kJ/mol  
38
Enthalpy of Fusion
33.05 kJ/mol  
2
11.76 kJ/mol  
29
Enthalpy of Atomization
791.00 kJ/mol  
2
301.00 kJ/mol  
36
Standard Molar Entropy
36.90 J/mol.K  
99+
75.30 J/mol.K  
8
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