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Gadolinium vs Hafnium

Gadolinium
Hafnium
Hafnium vs Gadolinium


Periodic Table
Symbol
Gd  
Hf  
Group Number
0  
18
4  
14
Period Number
6  
6  
Block
f block  
d block  
Element Family
Lanthanide  
Transition Metal  
CAS Number
7440542  
33
7440586  
30
Space Group Name
P63/mmc  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Gadolinium is not found free in nature, hence it is not a native metal.
  • Gadolinium metal found in minerals like Monazite and Bastnaesite.
  
  • 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  
By-product Zirconium Refining  
History
  
  
Who Discovered
Jean Charles Galissard de Marignac  
Dirk Coster and George de Hevesy  
Discovery
In 1880  
In 1922  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
26
Abundance In Sun
0.00 %  
25
0.00 %  
26
Abundance In Meteorites
0.00 %  
34
0.00 %  
37
Abundance In Earth's Crust
0.00 %  
30
0.00 %  
31
Abundance In Oceans
0.00 %  
38
0.00 %  
27
Abundance In Humans
0.00 %  
24
0.00 %  
14
Uses
Uses & Benefits
  • Its alloys are also used in making Magnets, electronic components and Data storage devices.
  • Compound of Gadolinium metal are used in magnetic resonance imaging (MRI).
  
  • 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
Aerospace Industry, Electrical Industry, Electronic Industry  
Ammunition Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
Non Toxic  
Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,311.00 °C  
35
2,150.00 °C  
10
Boiling Point
3,233.00 °C  
26
5,400.00 °C  
5
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
4.50  
10
5.50  
7
Brinell Hardness
700.00 MPa  
17
1,450.00 MPa  
6
Vickers Hardness
510.00 MPa  
34
1,520.00 MPa  
10
Speed of Sound
2,680.00 m/s  
99+
3,010.00 m/s  
39
Optical Properties
  
  
Refractive Index
1.97  
16
2.00  
15
Reflectivity
59.00 %  
24
71.00 %  
12
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Gd  
Hf  
Isotopes
  
  
Known Isotopes
26  
13
32  
7
Electronegativity
  
  
Pauling Electronegativity
1.20  
40
1.30  
33
Sanderson Electronegativity
1.20  
32
1.30  
25
Allred Rochow Electronegativity
1.11  
30
1.23  
26
Mulliken-Jaffe Electronegativity
1.20  
39
1.30  
33
Allen Electronegativity
1.20  
99+
1.16  
99+
Electropositivity
  
  
Pauling Electropositivity
2.80  
15
2.70  
22
Ionization Energies
  
  
1st Energy Level
593.40 kJ/mol  
99+
658.50 kJ/mol  
40
2nd Energy Level
1,170.00 kJ/mol  
99+
1,440.00 kJ/mol  
99+
3rd Energy Level
1,990.00 kJ/mol  
99+
2,250.00 kJ/mol  
99+
4th Energy Level
4,250.00 kJ/mol  
40
3,216.00 kJ/mol  
99+
5th Energy Level
5,930.00 kJ/mol  
99+
6,585.00 kJ/mol  
33
6th Energy Level
5,930.00 kJ/mol  
99+
6,585.00 kJ/mol  
99+
7th Energy level
5,930.00 kJ/mol  
99+
6,580.00 kJ/mol  
99+
8th Energy Level
5,930.00 kJ/mol  
99+
6,580.00 kJ/mol  
99+
9th Energy Level
5,930.00 kJ/mol  
99+
6,585.00 kJ/mol  
38
10th Energy Level
5,930.00 kJ/mol  
99+
6,590.00 kJ/mol  
40
11th Energy Level
5,930.00 kJ/mol  
99+
6,585.00 kJ/mol  
40
12th Energy Level
59,300.00 kJ/mol  
17
6,580.00 kJ/mol  
99+
13th Energy Level
5,930.00 kJ/mol  
99+
6,580.00 kJ/mol  
35
14th Energy Level
5,930.00 kJ/mol  
36
658.50 kJ/mol  
99+
15th Energy Level
59,300.00 kJ/mol  
99+
65,800.00 kJ/mol  
34
16th Energy Level
59,300.00 kJ/mol  
37
658.50 kJ/mol  
99+
17th Energy Level
594.10 kJ/mol  
99+
658.50 kJ/mol  
99+
18th Energy Level
5,930.00 kJ/mol  
99+
6,585.00 kJ/mol  
36
19th Energy Level
593.40 kJ/mol  
99+
658.50 kJ/mol  
99+
20th Energy Level
594.00 kJ/mol  
99+
658.00 kJ/mol  
37
21st Energy Level
593.40 kJ/mol  
99+
658.50 kJ/mol  
99+
22nd Energy Level
593.00 kJ/mol  
99+
658.00 kJ/mol  
31
23rd Energy Level
593.40 kJ/mol  
99+
658.50 kJ/mol  
99+
24th Energy Level
593.40 kJ/mol  
99+
658.50 kJ/mol  
31
25th Energy Level
593.00 kJ/mol  
99+
658.00 kJ/mol  
33
26th Energy Level
593.40 kJ/mol  
99+
658.50 kJ/mol  
32
27th Energy Level
593.40 kJ/mol  
99+
658.50 kJ/mol  
33
28th Energy Level
593.40 kJ/mol  
99+
658.50 kJ/mol  
38
29th Energy Level
593.40 kJ/mol  
99+
658.50 kJ/mol  
39
30th Energy Level
593.40 kJ/mol  
99+
658.00 kJ/mol  
35
Electrochemical Equivalent
1.96 g/amp-hr  
36
1.66 g/amp-hr  
99+
Electron Work Function
3.10 eV  
99+
3.90 eV  
36
Other Chemical Properties
Corrosion, Flammable, Ionization, Radioactive Isotopes  
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
64  
99+
72  
99+
Electron Configuration
[Xe] 4f7 5d1 6s2  
[Xe] 4f14 5d2 6s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
HCP-Crystal-Structure-of-Gadolinium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
64  
99+
72  
99+
Number of Neutrons
93  
38
106  
30
Number of Electrons
64  
99+
72  
99+
Radius of an Atom
  
  
Atomic Radius
180.00 pm  
16
159.00 pm  
30
Covalent Radius
196.00 pm  
14
175.00 pm  
25
Van der Waals Radius
237.00 pm  
19
200.00 pm  
35
Atomic Weight
47.87 amu  
99+
178.49 amu  
39
Atomic Volume
19.90 cm3/mol  
32
13.60 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Europium
  
Lutetium
  
Next Element
Terbium
  
Tantalum
  
Valence Electron Potential
46.10 (-eV)  
35
81.00 (-eV)  
16
Lattice Constant
363.60 pm  
35
319.64 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.59  
29
1.58  
34
Mechanical
Density
  
  
Density At Room Temperature
7.90 g/cm3  
99+
13.31 g/cm3  
27
Density When Liquid (at m.p.)
7.40 g/cm3  
99+
12.00 g/cm3  
31
Tensile Strength
158.00 MPa  
23
445.00 MPa  
9
Viscosity
0.00  
23
0.00  
28
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
32
0.00 (Pa)  
37
Vapor Pressure at 2000 K
7.39 (Pa)  
9
0.00 (Pa)  
25
Elasticity properties
  
  
Shear Modulus
21.80 GPa  
99+
30.00 GPa  
27
Bulk Modulus
37.90 GPa  
99+
110.00 GPa  
15
Young's Modulus
54.80 GPa  
38
78.00 GPa  
27
Poisson Ratio
0.26  
23
0.37  
7
Other Mechanical Properties
Ductile, Malleable  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
7.90  
99+
13.31  
30
Magnetic Ordering
Ferromagnetic  
Paramagnetic  
Permeability
0.00 H/m  
12
0.00 H/m  
9
Susceptibility
0.00  
4
0.00  
13
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
1.31 nΩ·m  
99+
331.00 nΩ·m  
14
Electrical Conductivity
0.01 106/cm Ω  
99+
0.03 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.23 J/(kg K)  
27
0.14 J/(kg K)  
38
Molar Heat Capacity
37.03 J/mol·K  
3
25.73 J/mol·K  
99+
Thermal Conductivity
10.60 W/m·K  
99+
23.00 W/m·K  
99+
Critical Temperature
1,585.00 K  
38
2,500.00 K  
11
Thermal Expansion
9.40 µm/(m·K)  
99+
5.90 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
359.40 kJ/mol  
30
661.10 kJ/mol  
6
Enthalpy of Fusion
10.05 kJ/mol  
99+
25.10 kJ/mol  
8
Enthalpy of Atomization
352.00 kJ/mol  
36
703.00 kJ/mol  
5
Standard Molar Entropy
68.10 J/mol.K  
16
43.60 J/mol.K  
99+
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