Hafnium Neodymium Comparison
Periodic Table
Symbol
Hf
Nd
Group Number
4
14
1
17
Period Number
6
6
Block
d block
f block
Element Family
Transition Metal
Lanthanide
CAS Number
7440586
30
7440008
99+
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.
- Neodymium is not found free in nature, hence it is not a native metal.
- Neodymium metal found in minerals like Monazite and Bastnaesite.
Sources
By-product Zirconium Refining
Found in Minerals, Mining
History
Who Discovered
Dirk Coster and George de Hevesy
Carl Auer von Welsbach
Discovery
In 1922
In 1885
Abundance
Abundance In Universe
7 * 10-8 %
25
1 * 10-6 %
16
Abundance In Sun
~0.0000001 %
26
~0.0000003 %
24
Abundance In Meteorites
0.00 %
37
0.00 %
30
Abundance In Earth's Crust
0.00 %
31
0.00 %
20
Abundance In Oceans
0.00 %
27
0.00 %
30
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.
- Neodymium-Iron-boron alloy is used to make permanent magnets.
- It is used in microphones, Mp3 player, loudspeakers, mobile phones, etc.
Industrial Uses
Ammunition Industry
Aerospace Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
NA
Other Uses
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes
Alloys
Biological Properties
Toxicity
Toxic
Non Toxic
Present in Human Body
No
No
Physical Properties
Melting Point
2,150.00 °C
10
1,010.00 °C
99+
Boiling Point
5,400.00 °C
5
3,127.00 °C
28
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
265.00 MPa
35
Vickers Hardness
1,520.00 MPa
5
345.00 MPa
27
Speed of Sound
3,010.00 m/s
27
2,330.00 m/s
38
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
Nd
Isotopes
Known Isotopes
32
7
30
9
Electronegativity
Pauling Electronegativity
1.30
32
1.14
99+
Allred Rochow Electronegativity
1.23
25
1.07
32
Allen Electronegativity
1.16
37
Not Available
Electropositivity
Pauling Electropositivity
2.70
22
2.86
13
Ionization Energies
1st Energy Level
658.50 kJ/mol
40
533.10 kJ/mol
99+
2nd Energy Level
1,440.00 kJ/mol
99+
1,040.00 kJ/mol
99+
3rd Energy Level
2,250.00 kJ/mol
99+
2,130.00 kJ/mol
99+
4th Energy Level
3,216.00 kJ/mol
99+
3,900.00 kJ/mol
99+
Electrochemical Equivalent
1.66 g/amp-hr
99+
1.79 g/amp-hr
37
Electron Work Function
3.90 eV
27
3.20 eV
34
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility
Chemical Stability, Corrosion, Flammable, Ionization
Atomic Properties
Atomic Number
72
99+
60
99+
Electron Configuration
[Xe] 4f14 5d2 6s2
[Xe] 4f4 6s2
Crystal Structure
Hexagonal Close Packed (HCP)
Double Hexagonal Close Packed (DHCP)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
DHCP-Crystal-Structure-of-Neodymium.jpg#100
Atom
Number of Protons
72
99+
60
99+
Number of Neutrons
106
29
84
40
Number of Electrons
72
99+
60
99+
Radius of an Atom
Atomic Radius
159.00 pm
28
181.00 pm
13
Covalent Radius
175.00 pm
23
201.00 pm
10
Van der Waals Radius
200.00 pm
28
229.00 pm
20
Atomic Weight
178.49 amu
39
144.24 amu
99+
Atomic Volume
13.60 cm3/mol
38
20.60 cm3/mol
18
Adjacent Atomic Numbers
Valence Electron Potential
81.00 (-eV)
16
43.40 (-eV)
99+
Lattice Constant
319.64 pm
99+
365.80 pm
30
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, 2 π/3
Lattice C/A Ratio
1.58
12
1.61
4
Mechanical Properties
Density
Density At Room Temperature
13.31 g/cm3
26
7.01 g/cm3
99+
Density When Liquid (at m.p.)
12.00 g/cm3
12
6.89 g/cm3
36
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)
21
Vapor Pressure at 2000 K
0.00 (Pa)
24
101.00 (Pa)
2
Elasticity properties
Shear Modulus
30.00 GPa
23
16.30 GPa
38
Bulk Modulus
110.00 GPa
15
31.80 GPa
37
Young's Modulus
78.00 GPa
25
41.40 GPa
40
Poisson Ratio
0.37
7
0.28
16
Other Mechanical Properties
Ductile, Malleable
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
13.31
18
7.00
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
NA
Resistivity
331.00 nΩ·m
14
643.00 nΩ·m
6
Electrical Conductivity
0.03 106/cm Ω
39
0.02 106/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
0.19 J/(kg K)
32
Molar Heat Capacity
25.73 J/mol·K
36
27.45 J/mol·K
17
Thermal Conductivity
23.00 W/m·K
99+
16.50 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
5.90 µm/(m·K)
99+
9.60 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
661.10 kJ/mol
5
273.00 kJ/mol
34
Enthalpy of Fusion
25.10 kJ/mol
8
7.14 kJ/mol
99+
Enthalpy of Atomization
703.00 kJ/mol
5
322.00 kJ/mol
32
Standard Molar Entropy
43.60 J/mol.K
34
71.50 J/mol.K
13
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