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Thorium vs Samarium

Thorium
Samarium
Samarium vs Thorium


Periodic Table
Symbol
Th   
Sm   
Group Number
0   
18
Not Available   
Period Number
7   
6   
Block
f block   
f block   
Element Family
Actinide   
Lanthanide   
CAS Number
7440326   
99+
7440199   
99+
Space Group Name
P63/mmc   
R_ 3m   
Space Group Number
194.00   
5
166.00   
6
Facts
Interesting Facts
  • Thorium metal is used as an alternate option over Uranium for nuclear fuel.
  • Thorium metals appearance (silvery white, soft) is somewhat similar to Lead metal.
  
  • Samarium metals helps stimulating body metabolism.
  • Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
  
Sources
Found in Minerals, Mining   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Jöns Jakob Berzelius   
Lecoq de Boisbaudran   
Discovery
In 1829   
In 1879   
Abundance
  
  
Abundance In Universe
3 * 10-4 %   
9
5 * 10-7 %   
19
Abundance In Sun
~0.0004 %   
9
~0.0000001 %   
26
Abundance In Meteorites
0.05 %   
11
0.00 %   
37
Abundance In Earth's Crust
0.66 %   
7
0.00 %   
29
Abundance In Oceans
0.00 %   
15
0.00 %   
40
Uses
Uses & Benefits
  • Thorium metal is used as an allying agent for Magnesium, It imparts greater strength and resistance to temperature.
  • compound of this metal Thorium oxide is used as an industrial catalyst.
  
  • 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.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Medical Uses
Dentistry, Surgical Instruments Manufacturing   
NA   
Other Uses
Alloys, Jewellery, Sculptures, Statues   
Alloys, In Nuclear Reactors   
Biological Properties
  
  
Toxicity
Non Toxic   
Slightly Toxic   
Present in Human Body
Yes   
Yes   
In Blood
0.00 Blood/mg dm-3   
33
0.01 Blood/mg dm-3   
22
In Bone
0.02 p.p.m.   
29
Not Available   
Physical Properties
Melting Point
1,750.00 °C   
17
1,072.00 °C   
99+
Boiling Point
4,790.00 °C   
8
1,900.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery White   
Luster
NA   
Lustrous   
Hardness
  
  
Mohs Hardness
3.00   
12
Not Available   
Brinell Hardness
390.00 MPa   
29
441.00 MPa   
27
Vickers Hardness
295.00 MPa   
29
412.00 MPa   
24
Speed of Sound
2,490.00 m/s   
36
2,130.00 m/s   
99+
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
Th   
Sm   
Isotopes
  
  
Known Isotopes
28   
11
30   
9
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.17   
40
Allred Rochow Electronegativity
1.11   
29
1.07   
32
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.83   
14
Ionization Energies
  
  
1st Energy Level
587.00 kJ/mol   
99+
544.50 kJ/mol   
99+
2nd Energy Level
1,110.00 kJ/mol   
99+
1,070.00 kJ/mol   
99+
3rd Energy Level
1,978.00 kJ/mol   
99+
2,260.00 kJ/mol   
99+
4th Energy Level
2,780.00 kJ/mol   
99+
3,990.00 kJ/mol   
37
Electrochemical Equivalent
2.16 g/amp-hr   
24
1.87 g/amp-hr   
34
Electron Work Function
3.41 eV   
32
2.70 eV   
99+
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
90   
28
62   
99+
Electron Configuration
[Rn] 6d2 7s2   
[Xe] 4f6 6s2   
Crystal Structure
Face Centered Cubic (FCC)   
Rhombohedral (RHO)   
Crystal Lattice
FCC-Crystal-Structure-of-Thorium.jpg#100   
RHO-Crystal-Structure-of-Samarium.jpg#100   
Atom
  
  
Number of Protons
90   
28
62   
99+
Number of Neutrons
142   
15
88   
39
Number of Electrons
90   
28
62   
99+
Radius of an Atom
  
  
Atomic Radius
179.80 pm   
15
180.00 pm   
14
Covalent Radius
206.00 pm   
7
198.00 pm   
13
Van der Waals Radius
237.00 pm   
15
229.00 pm   
20
Atomic Weight
232.04 amu   
23
150.36 amu   
99+
Atomic Volume
19.90 cm3/mol   
20
19.95 cm3/mol   
19
Adjacent Atomic Numbers
  
  
Previous Element
Actinium
  
Promethium
  
Next Element
Protactinium
  
Europium
  
Valence Electron Potential
59.30 (-eV)   
23
44.80 (-eV)   
37
Lattice Constant
508.42 pm   
14
362.10 pm   
33
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
11.72 g/cm3   
32
7.52 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
7.16 g/cm3   
32
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.94 (Pa)   
9
Vapor Pressure at 2000 K
0.00 (Pa)   
22
Not Available   
Elasticity properties
  
  
Shear Modulus
31.00 GPa   
21
19.50 GPa   
34
Bulk Modulus
54.00 GPa   
22
37.80 GPa   
35
Young's Modulus
79.00 GPa   
24
49.70 GPa   
37
Poisson Ratio
0.27   
20
0.27   
19
Other Mechanical Properties
Ductile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
11.70   
23
7.52   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Superconductor   
Conductor   
Resistivity
157.00 nΩ·m   
22
0.94 nΩ·m   
99+
Electrical Conductivity
0.07 106/cm Ω   
31
0.01 106/cm Ω   
99+
Electron Affinity
Not Available   
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.20 J/(kg K)   
31
Molar Heat Capacity
26.23 J/mol·K   
30
29.54 J/mol·K   
7
Thermal Conductivity
54.00 W/m·K   
28
13.30 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
11.00 µm/(m·K)   
36
12.70 µm/(m·K)   
30
Enthalpy
  
  
Enthalpy of Vaporization
429.00 kJ/mol   
15
166.40 kJ/mol   
99+
Enthalpy of Fusion
15.48 kJ/mol   
19
8.62 kJ/mol   
40
Enthalpy of Atomization
468.60 kJ/mol   
15
209.00 kJ/mol   
99+
Standard Molar Entropy
27.30 J/mol.K   
99+
69.60 J/mol.K   
15
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