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Hafnium vs Holmium

Hafnium
Holmium
Holmium vs Hafnium


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