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Samarium vs Cesium

Samarium
Cesium
Cesium vs Samarium


Periodic Table
Symbol
Sm   
Cs   
Group Number
Not Available   
1   
17
Period Number
6   
6   
Block
f block   
s block   
Element Family
Lanthanide   
Alkali   
CAS Number
7440199   
99+
7440462   
40
Space Group Name
R_ 3m   
Im_ 3m   
Space Group Number
166.00   
6
229.00   
1
Facts
Interesting Facts
  • Samarium metals helps stimulating body metabolism.
  • Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
  
Not Available   
Sources
Found in Minerals, Mining, Ores of Minerals   
Earth's crust, Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Lecoq de Boisbaudran   
Robert Bunsen and Gustav Kirchhoff   
Discovery
In 1879   
In 1860   
Abundance
  
  
Abundance In Universe
5 * 10-7 %   
19
8 * 10-8 %   
24
Abundance In Sun
~0.0000001 %   
26
~0.0000008 %   
20
Abundance In Meteorites
0.00 %   
37
0.00 %   
38
Abundance In Earth's Crust
0.00 %   
29
0.00 %   
35
Abundance In Oceans
0.00 %   
40
0.00 %   
17
Abundance In Humans
Not Available   
0.00 %   
17
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.
  
  • The most common use of cesium metal is as a drilling fluid. It is also used in optical glass manufacturing.
  • In vacuum tubes and radiation monitor equipment this metal is used as a catalyst promoter.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, In Nuclear Reactors   
Alloys   
Biological Properties
  
  
Toxicity
Slightly Toxic   
Mildly Toxic   
Present in Human Body
Yes   
Yes   
In Blood
0.01 Blood/mg dm-3   
22
0.00 Blood/mg dm-3   
28
In Bone
Not Available   
0.05 p.p.m.   
26
Physical Properties
Melting Point
1,072.00 °C   
99+
28.50 °C   
99+
Boiling Point
1,900.00 °C   
99+
678.40 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery Gold   
Luster
Lustrous   
NA   
Hardness
  
  
Mohs Hardness
Not Available   
0.20   
25
Brinell Hardness
441.00 MPa   
27
0.14 MPa   
99+
Vickers Hardness
412.00 MPa   
24
Not Available   
Speed of Sound
2,130.00 m/s   
99+
Not Available   
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
Sm   
Cs   
Isotopes
  
  
Known Isotopes
30   
9
36   
3
Electronegativity
  
  
Pauling Electronegativity
1.17   
40
0.79   
99+
Sanderson Electronegativity
Not Available   
0.22   
33
Allred Rochow Electronegativity
1.07   
32
0.86   
99+
Mulliken-Jaffe Electronegativity
Not Available   
0.62   
26
Allen Electronegativity
Not Available   
0.66   
99+
Electropositivity
  
  
Pauling Electropositivity
2.83   
14
3.21   
2
Ionization Energies
  
  
1st Energy Level
544.50 kJ/mol   
99+
375.70 kJ/mol   
99+
2nd Energy Level
1,070.00 kJ/mol   
99+
2,234.30 kJ/mol   
8
3rd Energy Level
2,260.00 kJ/mol   
99+
3,400.00 kJ/mol   
16
4th Energy Level
3,990.00 kJ/mol   
37
Not Available   
Electrochemical Equivalent
1.87 g/amp-hr   
34
4.96 g/amp-hr   
3
Electron Work Function
2.70 eV   
99+
2.14 eV   
99+
Other Chemical Properties
Ionization, Radioactive Isotopes   
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
62   
99+
55   
99+
Electron Configuration
[Xe] 4f6 6s2   
[Xe] 6s1   
Crystal Structure
Rhombohedral (RHO)   
Body Centered Cubic (BCC)   
Crystal Lattice
RHO-Crystal-Structure-of-Samarium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
62   
99+
55   
99+
Number of Neutrons
88   
39
78   
99+
Number of Electrons
62   
99+
55   
99+
Radius of an Atom
  
  
Atomic Radius
180.00 pm   
14
265.00 pm   
1
Covalent Radius
198.00 pm   
13
244.00 pm   
2
Van der Waals Radius
229.00 pm   
20
343.00 pm   
2
Atomic Weight
150.36 amu   
99+
132.91 amu   
99+
Atomic Volume
19.95 cm3/mol   
19
71.07 cm3/mol   
1
Adjacent Atomic Numbers
  
  
Previous Element
Promethium
  
Tin
  
Next Element
Europium
  
Barium
  
Valence Electron Potential
44.80 (-eV)   
37
8.62 (-eV)   
99+
Lattice Constant
362.10 pm   
33
614.10 pm   
5
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
7.52 g/cm3   
99+
1.93 g/cm3   
99+
Density When Liquid (at m.p.)
7.16 g/cm3   
32
1.84 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
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
Not Available   
Bulk Modulus
37.80 GPa   
35
1.60 GPa   
99+
Young's Modulus
49.70 GPa   
37
1.70 GPa   
99+
Poisson Ratio
0.27   
19
Not Available   
Other Mechanical Properties
NA   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
7.52   
99+
1.87   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Semiconductor   
Resistivity
0.94 nΩ·m   
99+
205.00 nΩ·m   
17
Electrical Conductivity
0.01 106/cm Ω   
99+
0.05 106/cm Ω   
35
Electron Affinity
50.00 kJ/mol   
21
45.50 kJ/mol   
25
Thermal Properties
Specific Heat
0.20 J/(kg K)   
31
0.24 J/(kg K)   
23
Molar Heat Capacity
29.54 J/mol·K   
7
32.21 J/mol·K   
4
Thermal Conductivity
13.30 W/m·K   
99+
35.90 W/m·K   
36
Critical Temperature
Not Available   
1,938.00 K   
5
Thermal Expansion
12.70 µm/(m·K)   
30
97.00 µm/(m·K)   
1
Enthalpy
  
  
Enthalpy of Vaporization
166.40 kJ/mol   
99+
65.90 kJ/mol   
99+
Enthalpy of Fusion
8.62 kJ/mol   
40
2.10 kJ/mol   
99+
Enthalpy of Atomization
209.00 kJ/mol   
99+
78.20 kJ/mol   
99+
Standard Molar Entropy
69.60 J/mol.K   
15
85.20 J/mol.K   
3
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