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Samarium Cadmium Comparison

Samarium
Cadmium
Cadmium Samarium comparison


Periodic Table
Symbol
Sm   
Cd   
Group Number
Not Available   
12   
6
Period Number
6   
5   
Block
f block   
d block   
Element Family
Lanthanide   
Transition Metal   
CAS Number
7440199   
99+
7440439   
99+
Space Group Name
R_ 3m   
P63/mmc   
Space Group Number
166.00   
6
194.00   
5
Facts
Interesting Facts
  • Samarium metals helps stimulating body metabolism.
  • Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
  
  • Naturally occurring minor elements include Cadmium.
  • Cadmium is released into atmosphere to control volcanic eruption and forest fires.
  • It is used for electroplating of Steel for corrosion resistance.
  • It can absorb neutrons and used in nuclear reactor to control atomic fission.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
Found As a By-product, Found in Minerals, Mining   
History
  
  
Who Discovered
Lecoq de Boisbaudran   
Karl Samuel Leberecht Hermann and Friedrich Stromeyer   
Discovery
In 1879   
In 1817   
Abundance
  
  
Abundance In Universe
5 * 10-7 %   
19
2 * 10-7 %   
22
Abundance In Sun
~0.0000001 %   
26
~0.0000006 %   
21
Abundance In Meteorites
0.00 %   
37
0.00 %   
31
Abundance In Earth's Crust
0.00 %   
29
0.00 %   
99+
Abundance In Oceans
0.00 %   
40
0.00 %   
28
Abundance In Humans
Not Available   
0.00 %   
11
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.
  
  • It has very limited uses as it is a toxic metal and it can cause birth defects, cancer, etc.
  • Almost 80% of Cadmium metal is used in Nickel cadmium Batteries and now it is getting replaced with nickel hydride.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Aerospace Industry, Ammunition Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
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
0.01 Blood/mg dm-3   
24
In Bone
Not Available   
1.80 p.p.m.   
15
Physical Properties
Melting Point
1,072.00 °C   
99+
320.90 °C   
99+
Boiling Point
1,900.00 °C   
99+
765.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery Bluish-Gray   
Luster
Lustrous   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
2.00   
16
Brinell Hardness
441.00 MPa   
27
203.00 MPa   
39
Vickers Hardness
412.00 MPa   
24
Not Available   
Speed of Sound
2,130.00 m/s   
99+
2,310.00 m/s   
39
Optical Properties
  
  
Reflectivity
Not Available   
67.00 %   
11
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
Sm   
Cd   
Isotopes
  
  
Known Isotopes
30   
9
34   
5
Electronegativity
  
  
Pauling Electronegativity
1.17   
40
1.69   
17
Sanderson Electronegativity
Not Available   
1.98   
9
Allred Rochow Electronegativity
1.07   
32
1.46   
15
Mulliken-Jaffe Electronegativity
Not Available   
1.53   
13
Allen Electronegativity
Not Available   
1.52   
27
Electropositivity
  
  
Pauling Electropositivity
2.83   
14
2.31   
37
Ionization Energies
  
  
1st Energy Level
544.50 kJ/mol   
99+
867.80 kJ/mol   
11
2nd Energy Level
1,070.00 kJ/mol   
99+
1,631.40 kJ/mol   
32
3rd Energy Level
2,260.00 kJ/mol   
99+
3,616.00 kJ/mol   
13
4th Energy Level
3,990.00 kJ/mol   
37
Not Available   
Electrochemical Equivalent
1.87 g/amp-hr   
34
2.10 g/amp-hr   
27
Electron Work Function
2.70 eV   
99+
4.22 eV   
22
Other Chemical Properties
Ionization, Radioactive Isotopes   
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
62   
99+
48   
99+
Electron Configuration
[Xe] 4f6 6s2   
[Kr] 4d10 5s2   
Crystal Structure
Rhombohedral (RHO)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
RHO-Crystal-Structure-of-Samarium.jpg#100   
HCP-Crystal-Structure-of-Cadmium.jpg#100   
Atom
  
  
Number of Protons
62   
99+
48   
99+
Number of Neutrons
88   
39
64   
99+
Number of Electrons
62   
99+
48   
99+
Radius of an Atom
  
  
Atomic Radius
180.00 pm   
14
151.00 pm   
32
Covalent Radius
198.00 pm   
13
144.00 pm   
40
Van der Waals Radius
229.00 pm   
20
158.00 pm   
99+
Atomic Weight
150.36 amu   
99+
112.41 amu   
99+
Atomic Volume
19.95 cm3/mol   
19
13.10 cm3/mol   
39
Adjacent Atomic Numbers
  
  
Previous Element
Promethium
  
Silver
  
Next Element
Europium
  
Indium
  
Valence Electron Potential
44.80 (-eV)   
37
30.00 (-eV)   
99+
Lattice Constant
362.10 pm   
33
297.94 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.89   
1
Mechanical Properties
Density
  
  
Density At Room Temperature
7.52 g/cm3   
99+
8.65 g/cm3   
99+
Density When Liquid (at m.p.)
7.16 g/cm3   
32
8.00 g/cm3   
28
Tensile Strength
Not Available   
62.00 MPa   
16
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.94 (Pa)   
9
Not Available   
Elasticity properties
  
  
Shear Modulus
19.50 GPa   
34
19.00 GPa   
35
Bulk Modulus
37.80 GPa   
35
42.00 GPa   
29
Young's Modulus
49.70 GPa   
37
50.00 GPa   
36
Poisson Ratio
0.27   
19
0.30   
14
Other Mechanical Properties
NA   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
7.52   
99+
8.65   
36
Magnetic Ordering
Paramagnetic   
Diamagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Semiconductor   
Resistivity
0.94 nΩ·m   
99+
72.70 nΩ·m   
36
Electrical Conductivity
0.01 106/cm Ω   
99+
0.14 106/cm Ω   
15
Electron Affinity
50.00 kJ/mol   
21
0.00 kJ/mol   
40
Thermal Properties
Specific Heat
0.20 J/(kg K)   
31
0.23 J/(kg K)   
26
Molar Heat Capacity
29.54 J/mol·K   
7
26.02 J/mol·K   
32
Thermal Conductivity
13.30 W/m·K   
99+
96.60 W/m·K   
16
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
12.70 µm/(m·K)   
30
30.80 µm/(m·K)   
10
Enthalpy
  
  
Enthalpy of Vaporization
166.40 kJ/mol   
99+
100.00 kJ/mol   
99+
Enthalpy of Fusion
8.62 kJ/mol   
40
6.19 kJ/mol   
99+
Enthalpy of Atomization
209.00 kJ/mol   
99+
113.00 kJ/mol   
99+
Standard Molar Entropy
69.60 J/mol.K   
15
51.80 J/mol.K   
27
Summary >>
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