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Samarium vs Cobalt

Samarium
Cobalt
Cobalt vs Samarium


Periodic Table
Symbol
Sm  
Co  
Group Number
3  
15
9  
9
Period Number
6  
4  
Block
f block  
d block  
Element Family
Lanthanide  
Transition Metal  
CAS Number
7440199  
99+
7440484  
38
Space Group Name
R_ 3m  
P63/mmc  
Space Group Number
166.00  
9
194.00  
7
Facts
Interesting Facts
  • Samarium metals helps stimulating body metabolism.
  • Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
  
  • The main source of Cobalt is as a by-product of copper and nickel metal mining.
  • Cobalt metal can be obtained from other elements like Oxygen, Sulfur and Arsenic.
  • It s also used in electroplating process as it exhibits anti cession properties.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found in Compounds, Mining, Ores of Minerals  
History
  
  
Who Discovered
Lecoq de Boisbaudran  
Georg Brandt  
Discovery
In 1879  
In 1732  
Abundance
  
  
Abundance In Universe
0.00 %  
20
0.00 %  
10
Abundance In Sun
0.00 %  
26
0.00 %  
9
Abundance In Meteorites
0.00 %  
37
0.06 %  
10
Abundance In Earth's Crust
0.00 %  
29
0.00 %  
21
Abundance In Oceans
0.00 %  
40
0.00 %  
20
Abundance In Humans
0.00 %  
24
0.00 %  
20
Uses
Uses & Benefits
  • Magnets of Samarium cobalt alloy are stronger than that of Iron and hence, they are used in microwave application.
  • Samarium metal also used in optical lasers and infrared absorbing glasses and as a neutron absorber.
  
  • Its alloys with aluminum and nickel are used to make powerful magnets.
  • Few other alloys exhibit high-temperature strength and hence they are used in Turbines of Jet and Gas engine.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Chemical Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
Pharmaceutical Industry  
Other Uses
Alloys, In Nuclear Reactors  
Alloys  
Biological Properties
  
  
Toxicity
Slightly Toxic  
Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.01 Blood/mg dm-3  
22
0.04 Blood/mg dm-3  
18
In Bone
0.00 p.p.m.  
99+
0.04 p.p.m.  
32
Physical
Melting Point
1,072.00 °C  
99+
1,495.00 °C  
29
Boiling Point
1,900.00 °C  
99+
2,870.00 °C  
35
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Gray  
Luster
Lustrous  
Metallic  
Hardness
  
  
Mohs Hardness
5.50  
7
5.00  
8
Brinell Hardness
441.00 MPa  
32
470.00 MPa  
31
Vickers Hardness
412.00 MPa  
40
1,043.00 MPa  
18
Speed of Sound
2,130.00 m/s  
99+
4,720.00 m/s  
18
Optical Properties
  
  
Refractive Index
1.80  
22
2.50  
5
Reflectivity
65.00 %  
18
67.00 %  
16
Allotropes
No  
Yes  
α Allotropes
-  
α-Cobalt  
β Allotropes
-  
β-Cobalt  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Sm  
Co  
Isotopes
  
  
Known Isotopes
30  
9
26  
13
Electronegativity
  
  
Pauling Electronegativity
1.17  
99+
1.88  
13
Sanderson Electronegativity
1.17  
33
2.56  
1
Allred Rochow Electronegativity
1.07  
33
1.70  
6
Mulliken-Jaffe Electronegativity
1.17  
40
1.88  
14
Allen Electronegativity
1.17  
99+
1.84  
13
Electropositivity
  
  
Pauling Electropositivity
2.83  
14
2.12  
99+
Ionization Energies
  
  
1st Energy Level
544.50 kJ/mol  
99+
760.40 kJ/mol  
19
2nd Energy Level
1,070.00 kJ/mol  
99+
1,648.00 kJ/mol  
32
3rd Energy Level
2,260.00 kJ/mol  
99+
3,232.00 kJ/mol  
22
4th Energy Level
3,990.00 kJ/mol  
99+
4,950.00 kJ/mol  
29
5th Energy Level
5,445.00 kJ/mol  
99+
7,670.00 kJ/mol  
18
6th Energy Level
5,445.00 kJ/mol  
99+
9,840.00 kJ/mol  
18
7th Energy level
5,445.00 kJ/mol  
99+
12,440.00 kJ/mol  
11
8th Energy Level
5,400.00 kJ/mol  
99+
15,230.00 kJ/mol  
12
9th Energy Level
5,440.00 kJ/mol  
99+
17,959.00 kJ/mol  
13
10th Energy Level
5,445.00 kJ/mol  
99+
26,570.00 kJ/mol  
7
11th Energy Level
5,445.00 kJ/mol  
99+
29,400.00 kJ/mol  
8
12th Energy Level
5,440.00 kJ/mol  
99+
32,400.00 kJ/mol  
30
13th Energy Level
5,445.00 kJ/mol  
99+
36,600.00 kJ/mol  
8
14th Energy Level
5,450.00 kJ/mol  
99+
39,700.00 kJ/mol  
9
15th Energy Level
54,450.00 kJ/mol  
99+
42,800.00 kJ/mol  
99+
16th Energy Level
54,400.00 kJ/mol  
99+
49,396.00 kJ/mol  
99+
17th Energy Level
544.50 kJ/mol  
99+
52,737.00 kJ/mol  
13
18th Energy Level
5,445.00 kJ/mol  
99+
134,810.00 kJ/mol  
1
19th Energy Level
544.50 kJ/mol  
99+
145,170.00 kJ/mol  
2
20th Energy Level
624.00 kJ/mol  
99+
154,700.00 kJ/mol  
4
21st Energy Level
544.50 kJ/mol  
99+
167,400.00 kJ/mol  
4
22nd Energy Level
624.00 kJ/mol  
37
178,100.00 kJ/mol  
3
23rd Energy Level
544.50 kJ/mol  
99+
189,300.00 kJ/mol  
3
24th Energy Level
544.50 kJ/mol  
99+
760.40 kJ/mol  
17
25th Energy Level
544.00 kJ/mol  
99+
760.40 kJ/mol  
17
26th Energy Level
544.50 kJ/mol  
99+
760.40 kJ/mol  
17
27th Energy Level
544.50 kJ/mol  
99+
760.40 kJ/mol  
16
28th Energy Level
544.50 kJ/mol  
99+
760.40 kJ/mol  
22
29th Energy Level
544.50 kJ/mol  
99+
760.40 kJ/mol  
23
30th Energy Level
544.00 kJ/mol  
99+
760.40 kJ/mol  
17
Electrochemical Equivalent
1.87 g/amp-hr  
38
1.10 g/amp-hr  
99+
Electron Work Function
2.70 eV  
99+
5.00 eV  
9
Other Chemical Properties
Ionization, Radioactive Isotopes  
Chemical Stability, Ionization  
Atomic
Atomic Number
62  
99+
22  
99+
Electron Configuration
[Xe] 4f6 6s2  
[Ar] 3d2 4s2  
Crystal Structure
Rhombohedral (RHO)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
RHO-Crystal-Structure-of-Samarium.jpg#100  
HCP-Crystal-Structure-of-Cobalt.jpg#100  
Atom
  
  
Number of Protons
62  
99+
22  
99+
Number of Neutrons
88  
40
26  
99+
Number of Electrons
62  
99+
22  
99+
Radius of an Atom
  
  
Atomic Radius
180.00 pm  
16
147.00 pm  
36
Covalent Radius
198.00 pm  
13
160.00 pm  
32
Van der Waals Radius
229.00 pm  
25
200.00 pm  
35
Atomic Weight
150.36 amu  
99+
47.87 amu  
99+
Atomic Volume
19.95 cm3/mol  
31
10.64 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Promethium
  
Iron
  
Next Element
Europium
  
Nickel
  
Valence Electron Potential
44.80 (-eV)  
38
95.20 (-eV)  
10
Lattice Constant
362.10 pm  
37
295.08 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.62  
15
1.26  
99+
Mechanical
Density
  
  
Density At Room Temperature
7.52 g/cm3  
99+
4.51 g/cm3  
99+
Density When Liquid (at m.p.)
7.16 g/cm3  
99+
4.11 g/cm3  
99+
Tensile Strength
50.00 MPa  
38
434.00 MPa  
10
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.94 (Pa)  
9
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
29
0.98 (Pa)  
14
Elasticity properties
  
  
Shear Modulus
19.50 GPa  
99+
44.00 GPa  
17
Bulk Modulus
37.80 GPa  
99+
110.00 GPa  
15
Young's Modulus
49.70 GPa  
40
116.00 GPa  
20
Poisson Ratio
0.27  
19
0.32  
12
Other Mechanical Properties
-  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
7.52  
99+
4,500.00  
1
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
9
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
3
Electrical Properties
  
  
Electrical Property
Conductor  
Poor Conductor  
Resistivity
0.94 nΩ·m  
99+
420.00 nΩ·m  
12
Electrical Conductivity
0.01 106/cm Ω  
99+
0.02 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
7.60 kJ/mol  
99+
Thermal
Specific Heat
0.20 J/(kg K)  
32
0.52 J/(kg K)  
9
Molar Heat Capacity
29.54 J/mol·K  
9
25.06 J/mol·K  
99+
Thermal Conductivity
13.30 W/m·K  
99+
21.90 W/m·K  
99+
Critical Temperature
1,345.00 K  
99+
1,768.00 K  
32
Thermal Expansion
12.70 µm/(m·K)  
39
8.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
166.40 kJ/mol  
99+
429.00 kJ/mol  
20
Enthalpy of Fusion
8.62 kJ/mol  
99+
15.48 kJ/mol  
19
Enthalpy of Atomization
209.00 kJ/mol  
99+
468.60 kJ/mol  
20
Standard Molar Entropy
69.60 J/mol.K  
15
27.30 J/mol.K  
99+
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