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Holmium vs Hafnium

Holmium
Hafnium
Hafnium vs Holmium


Periodic Table
Symbol
Ho   
Hf   
Group Number
Not Available   
4   
14
Period Number
6   
6   
Block
f block   
d block   
Element Family
Lanthanide   
Transition Metal   
CAS Number
7440600   
29
7440586   
30
Space Group Name
P63/mmc   
P63/mmc   
Space Group Number
194.00   
5
194.00   
5
Facts
Interesting Facts
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
By-product Zirconium Refining   
History
  
  
Who Discovered
Marc Delafontaine   
Dirk Coster and George de Hevesy   
Discovery
In 1878   
In 1922   
Abundance
  
  
Abundance In Universe
5 * 10-8 %   
27
7 * 10-8 %   
25
Abundance In Sun
~-9999 %   
~0.0000001 %   
26
Abundance In Meteorites
0.00 %   
99+
0.00 %   
37
Abundance In Earth's Crust
0.00 %   
38
0.00 %   
31
Abundance In Oceans
0.00 %   
99+
0.00 %   
27
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.
  
  • 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
NA   
Ammunition Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research   
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Low Toxic   
Toxic   
Present in Human Body
No   
No   
Physical Properties
Melting Point
1,461.00 °C   
30
2,150.00 °C   
10
Boiling Point
2,600.00 °C   
99+
5,400.00 °C   
5
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Gray   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
5.50   
7
Brinell Hardness
746.00 MPa   
13
1,450.00 MPa   
6
Vickers Hardness
481.00 MPa   
23
1,520.00 MPa   
5
Speed of Sound
2,760.00 m/s   
30
3,010.00 m/s   
27
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
Ho   
Hf   
Isotopes
  
  
Known Isotopes
34   
5
32   
7
Electronegativity
  
  
Pauling Electronegativity
1.23   
37
1.30   
32
Allred Rochow Electronegativity
1.10   
30
1.23   
25
Allen Electronegativity
Not Available   
1.16   
37
Electropositivity
  
  
Pauling Electropositivity
2.77   
17
2.70   
22
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
658.50 kJ/mol   
40
2nd Energy Level
1,140.00 kJ/mol   
99+
1,440.00 kJ/mol   
99+
3rd Energy Level
2,204.00 kJ/mol   
99+
2,250.00 kJ/mol   
99+
4th Energy Level
4,100.00 kJ/mol   
34
3,216.00 kJ/mol   
99+
Electrochemical Equivalent
2.02 g/amp-hr   
29
1.66 g/amp-hr   
99+
Electron Work Function
Not Available   
3.90 eV   
27
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
67   
99+
72   
99+
Electron Configuration
[Xe] 4f11 6s2   
[Xe] 4f14 5d2 6s2   
Crystal Structure
Hexagonal Close Packed (HCP)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
HCP-Crystal-Structure-of-Holmium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
67   
99+
72   
99+
Number of Neutrons
98   
34
106   
29
Number of Electrons
67   
99+
72   
99+
Radius of an Atom
  
  
Atomic Radius
176.00 pm   
18
159.00 pm   
28
Covalent Radius
192.00 pm   
17
175.00 pm   
23
Van der Waals Radius
216.00 pm   
24
200.00 pm   
28
Atomic Weight
164.93 amu   
99+
178.49 amu   
39
Atomic Volume
18.70 cm3/mol   
24
13.60 cm3/mol   
38
Adjacent Atomic Numbers
  
  
Previous Element
Dysprosium
  
Lutetium
  
Next Element
Erbium
  
Tantalum
  
Valence Electron Potential
47.90 (-eV)   
31
81.00 (-eV)   
16
Lattice Constant
357.73 pm   
38
319.64 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
1.57   
17
1.58   
12
Mechanical Properties
Density
  
  
Density At Room Temperature
8.79 g/cm3   
99+
13.31 g/cm3   
26
Density When Liquid (at m.p.)
8.34 g/cm3   
26
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)   
16
Not Available   
Vapor Pressure at 2000 K
Not Available   
0.00 (Pa)   
24
Elasticity properties
  
  
Shear Modulus
26.30 GPa   
28
30.00 GPa   
23
Bulk Modulus
40.20 GPa   
32
110.00 GPa   
15
Young's Modulus
64.80 GPa   
31
78.00 GPa   
25
Poisson Ratio
0.23   
29
0.37   
7
Other Mechanical Properties
Ductile, Malleable, Sectile   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
8.80   
35
13.31   
18
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
814.00 nΩ·m   
4
331.00 nΩ·m   
14
Electrical Conductivity
0.01 106/cm Ω   
99+
0.03 106/cm Ω   
39
Electron Affinity
50.00 kJ/mol   
21
0.00 kJ/mol   
40
Thermal Properties
Specific Heat
0.16 J/(kg K)   
35
0.14 J/(kg K)   
37
Molar Heat Capacity
27.15 J/mol·K   
19
25.73 J/mol·K   
36
Thermal Conductivity
16.20 W/m·K   
99+
23.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
11.20 µm/(m·K)   
35
5.90 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
241.00 kJ/mol   
38
661.10 kJ/mol   
5
Enthalpy of Fusion
11.76 kJ/mol   
29
25.10 kJ/mol   
8
Enthalpy of Atomization
301.00 kJ/mol   
36
703.00 kJ/mol   
5
Standard Molar Entropy
75.30 J/mol.K   
8
43.60 J/mol.K   
34
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