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Gadolinium vs Holmium

Gadolinium
Holmium
Holmium vs Gadolinium


Periodic Table
Symbol
Gd  
Ho  
Group Number
0  
18
3  
15
Period Number
6  
6  
Block
f block  
f block  
Element Family
Lanthanide  
Lanthanide  
CAS Number
7440542  
33
7440600  
29
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.
  
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
Sources
Found in Minerals, Mining  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Jean Charles Galissard de Marignac  
Marc Delafontaine  
Discovery
In 1880  
In 1878  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
28
Abundance In Sun
0.00 %  
25
-  
Abundance In Meteorites
0.00 %  
34
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
30
0.00 %  
38
Abundance In Oceans
0.00 %  
38
0.00 %  
99+
Abundance In Humans
0.00 %  
24
0.00 %  
24
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).
  
  • 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, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys, Nuclear Research  
Biological Properties
  
  
Toxicity
Non Toxic  
Low 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
1,461.00 °C  
30
Boiling Point
3,233.00 °C  
26
2,600.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
4.50  
10
4.00  
11
Brinell Hardness
700.00 MPa  
17
746.00 MPa  
14
Vickers Hardness
510.00 MPa  
34
481.00 MPa  
36
Speed of Sound
2,680.00 m/s  
99+
2,760.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.97  
16
1.67  
29
Reflectivity
59.00 %  
24
67.00 %  
16
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Gd  
Ho  
Isotopes
  
  
Known Isotopes
26  
13
34  
5
Electronegativity
  
  
Pauling Electronegativity
1.20  
40
1.23  
38
Sanderson Electronegativity
1.20  
32
1.23  
30
Allred Rochow Electronegativity
1.11  
30
1.10  
31
Mulliken-Jaffe Electronegativity
1.20  
39
1.23  
37
Allen Electronegativity
1.20  
99+
1.23  
99+
Electropositivity
  
  
Pauling Electropositivity
2.80  
15
2.77  
17
Ionization Energies
  
  
1st Energy Level
593.40 kJ/mol  
99+
581.00 kJ/mol  
99+
2nd Energy Level
1,170.00 kJ/mol  
99+
1,140.00 kJ/mol  
99+
3rd Energy Level
1,990.00 kJ/mol  
99+
2,204.00 kJ/mol  
99+
4th Energy Level
4,250.00 kJ/mol  
40
4,100.00 kJ/mol  
99+
5th Energy Level
5,930.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
6th Energy Level
5,930.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
7th Energy level
5,930.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
8th Energy Level
5,930.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
9th Energy Level
5,930.00 kJ/mol  
99+
6,500.00 kJ/mol  
39
10th Energy Level
5,930.00 kJ/mol  
99+
6,500.00 kJ/mol  
99+
11th Energy Level
5,930.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
12th Energy Level
59,300.00 kJ/mol  
17
5,810.00 kJ/mol  
99+
13th Energy Level
5,930.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
14th Energy Level
5,930.00 kJ/mol  
36
5,810.00 kJ/mol  
40
15th Energy Level
59,300.00 kJ/mol  
99+
58,100.00 kJ/mol  
99+
16th Energy Level
59,300.00 kJ/mol  
37
581.00 kJ/mol  
99+
17th Energy Level
594.10 kJ/mol  
99+
581.00 kJ/mol  
99+
18th Energy Level
5,930.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
19th Energy Level
593.40 kJ/mol  
99+
581.00 kJ/mol  
99+
20th Energy Level
594.00 kJ/mol  
99+
581.00 kJ/mol  
99+
21st Energy Level
593.40 kJ/mol  
99+
581.00 kJ/mol  
99+
22nd Energy Level
593.00 kJ/mol  
99+
581.00 kJ/mol  
99+
23rd Energy Level
593.40 kJ/mol  
99+
5,810.00 kJ/mol  
20
24th Energy Level
593.40 kJ/mol  
99+
581.00 kJ/mol  
99+
25th Energy Level
593.00 kJ/mol  
99+
581.00 kJ/mol  
99+
26th Energy Level
593.40 kJ/mol  
99+
581.00 kJ/mol  
99+
27th Energy Level
593.40 kJ/mol  
99+
584.70 kJ/mol  
99+
28th Energy Level
593.40 kJ/mol  
99+
581.00 kJ/mol  
99+
29th Energy Level
593.40 kJ/mol  
99+
584.70 kJ/mol  
99+
30th Energy Level
593.40 kJ/mol  
99+
581.00 kJ/mol  
99+
Electrochemical Equivalent
1.96 g/amp-hr  
36
2.02 g/amp-hr  
33
Electron Work Function
3.10 eV  
99+
4.90 eV  
12
Other Chemical Properties
Corrosion, Flammable, Ionization, Radioactive Isotopes  
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
64  
99+
67  
99+
Electron Configuration
[Xe] 4f7 5d1 6s2  
[Xe] 4f11 6s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
HCP-Crystal-Structure-of-Gadolinium.jpg#100  
HCP-Crystal-Structure-of-Holmium.jpg#100  
Atom
  
  
Number of Protons
64  
99+
67  
99+
Number of Neutrons
93  
38
98  
35
Number of Electrons
64  
99+
67  
99+
Radius of an Atom
  
  
Atomic Radius
180.00 pm  
16
176.00 pm  
20
Covalent Radius
196.00 pm  
14
192.00 pm  
17
Van der Waals Radius
237.00 pm  
19
216.00 pm  
30
Atomic Weight
47.87 amu  
99+
164.93 amu  
99+
Atomic Volume
19.90 cm3/mol  
32
18.70 cm3/mol  
36
Adjacent Atomic Numbers
  
  
Previous Element
Europium
  
Dysprosium
  
Next Element
Terbium
  
Erbium
  
Valence Electron Potential
46.10 (-eV)  
35
47.90 (-eV)  
32
Lattice Constant
363.60 pm  
35
357.73 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
1.57  
40
Mechanical
Density
  
  
Density At Room Temperature
7.90 g/cm3  
99+
8.79 g/cm3  
99+
Density When Liquid (at m.p.)
7.40 g/cm3  
99+
8.34 g/cm3  
99+
Tensile Strength
158.00 MPa  
23
270.00 MPa  
17
Viscosity
0.00  
23
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
32
0.00 (Pa)  
17
Vapor Pressure at 2000 K
7.39 (Pa)  
9
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
21.80 GPa  
99+
26.30 GPa  
35
Bulk Modulus
37.90 GPa  
99+
40.20 GPa  
37
Young's Modulus
54.80 GPa  
38
64.80 GPa  
33
Poisson Ratio
0.26  
23
0.23  
29
Other Mechanical Properties
Ductile, Malleable  
Ductile, Malleable, Sectile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
7.90  
99+
8.80  
99+
Magnetic Ordering
Ferromagnetic  
Paramagnetic  
Permeability
0.00 H/m  
12
0.00 H/m  
7
Susceptibility
0.00  
4
0.00  
11
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
1.31 nΩ·m  
99+
814.00 nΩ·m  
4
Electrical Conductivity
0.01 106/cm Ω  
99+
0.01 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
50.00 kJ/mol  
26
Thermal
Specific Heat
0.23 J/(kg K)  
27
0.16 J/(kg K)  
36
Molar Heat Capacity
37.03 J/mol·K  
3
27.15 J/mol·K  
25
Thermal Conductivity
10.60 W/m·K  
99+
16.20 W/m·K  
99+
Critical Temperature
1,585.00 K  
38
1,747.00 K  
34
Thermal Expansion
9.40 µm/(m·K)  
99+
11.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
359.40 kJ/mol  
30
241.00 kJ/mol  
99+
Enthalpy of Fusion
10.05 kJ/mol  
99+
11.76 kJ/mol  
35
Enthalpy of Atomization
352.00 kJ/mol  
36
301.00 kJ/mol  
99+
Standard Molar Entropy
68.10 J/mol.K  
16
75.30 J/mol.K  
8
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