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Thulium vs Samarium

Thulium
Samarium
Samarium vs Thulium


Periodic Table
Symbol
Tm   
Sm   
Group Number
Not Available   
Not Available   
Period Number
6   
6   
Block
f block   
f block   
Element Family
Lanthanide   
Lanthanide   
CAS Number
7440304   
99+
7440199   
99+
Space Group Name
P63/mmc   
R_ 3m   
Space Group Number
194.00   
5
166.00   
6
Facts
Interesting Facts
  • Thulium metal can resist corrosion due to dry air .
  • Only Tm-169 isotope of Thulium metal occur naturally.
  
  • 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, Ores of Minerals   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Per Teodor Cleve   
Lecoq de Boisbaudran   
Discovery
In 1879   
In 1879   
Abundance
  
  
Abundance In Universe
1 * 10-8 %   
30
5 * 10-7 %   
19
Abundance In Sun
~0.00000002 %   
28
~0.0000001 %   
26
Abundance In Meteorites
0.00 %   
99+
0.00 %   
37
Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
29
Abundance In Oceans
0.00 %   
99+
0.00 %   
40
Uses
Uses & Benefits
  • Thulium metal produces isotopes that emits X-rays. This isotope is used in X-ray machine.
  • Thulium element is also used in Surgical equipment like laser.
  
  • 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
NA   
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys, In Nuclear Reactors   
Biological Properties
  
  
Toxicity
Unknown   
Slightly Toxic   
Present in Human Body
No   
Yes   
In Blood
Not Available   
0.01 Blood/mg dm-3   
22
Physical Properties
Melting Point
1,545.00 °C   
23
1,072.00 °C   
99+
Boiling Point
1,730.00 °C   
99+
1,900.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery Gray   
Silvery White   
Luster
Metallic   
Lustrous   
Hardness
  
  
Brinell Hardness
471.00 MPa   
25
441.00 MPa   
27
Vickers Hardness
520.00 MPa   
21
412.00 MPa   
24
Speed of Sound
Not Available   
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
Tm   
Sm   
Isotopes
  
  
Known Isotopes
32   
7
30   
9
Electronegativity
  
  
Pauling Electronegativity
1.25   
35
1.17   
40
Allred Rochow Electronegativity
1.11   
29
1.07   
32
Electropositivity
  
  
Pauling Electropositivity
2.75   
19
2.83   
14
Ionization Energies
  
  
1st Energy Level
596.70 kJ/mol   
99+
544.50 kJ/mol   
99+
2nd Energy Level
1,160.00 kJ/mol   
99+
1,070.00 kJ/mol   
99+
3rd Energy Level
2,285.00 kJ/mol   
99+
2,260.00 kJ/mol   
99+
4th Energy Level
4,120.00 kJ/mol   
33
3,990.00 kJ/mol   
37
Electrochemical Equivalent
2.10 g/amp-hr   
26
1.87 g/amp-hr   
34
Electron Work Function
Not Available   
2.70 eV   
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
69   
99+
62   
99+
Electron Configuration
[Xe] 4f13 6s2   
[Xe] 4f6 6s2   
Crystal Structure
Hexagonal Close Packed (HCP)   
Rhombohedral (RHO)   
Crystal Lattice
HCP-Crystal-Structure-of-Thulium.jpg#100   
RHO-Crystal-Structure-of-Samarium.jpg#100   
Atom
  
  
Number of Protons
69   
99+
62   
99+
Number of Neutrons
100   
32
88   
39
Number of Electrons
69   
99+
62   
99+
Radius of an Atom
  
  
Atomic Radius
176.00 pm   
18
180.00 pm   
14
Covalent Radius
160.00 pm   
30
198.00 pm   
13
Van der Waals Radius
Not Available   
229.00 pm   
20
Atomic Weight
168.93 amu   
99+
150.36 amu   
99+
Atomic Volume
18.10 cm3/mol   
28
19.95 cm3/mol   
19
Adjacent Atomic Numbers
  
  
Previous Element
Erbium
  
Promethium
  
Next Element
Ytterbium
  
Europium
  
Valence Electron Potential
49.70 (-eV)   
28
44.80 (-eV)   
37
Lattice Constant
353.75 pm   
40
362.10 pm   
33
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
1.57   
17
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
9.32 g/cm3   
40
7.52 g/cm3   
99+
Density When Liquid (at m.p.)
8.56 g/cm3   
24
7.16 g/cm3   
32
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.06 (Pa)   
10
0.94 (Pa)   
9
Elasticity properties
  
  
Shear Modulus
30.50 GPa   
22
19.50 GPa   
34
Bulk Modulus
44.50 GPa   
26
37.80 GPa   
35
Young's Modulus
74.00 GPa   
27
49.70 GPa   
37
Poisson Ratio
0.21   
31
0.27   
19
Other Mechanical Properties
Ductile, Malleable   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
9.32   
31
7.52   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
676.00 nΩ·m   
5
0.94 nΩ·m   
99+
Electrical Conductivity
0.02 106/cm Ω   
99+
0.01 106/cm Ω   
99+
Electron Affinity
50.00 kJ/mol   
21
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
0.16 J/(kg K)   
35
0.20 J/(kg K)   
31
Molar Heat Capacity
27.03 J/mol·K   
22
29.54 J/mol·K   
7
Thermal Conductivity
16.90 W/m·K   
99+
13.30 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
13.30 µm/(m·K)   
29
12.70 µm/(m·K)   
30
Enthalpy
  
  
Enthalpy of Vaporization
191.00 kJ/mol   
99+
166.40 kJ/mol   
99+
Enthalpy of Fusion
16.80 kJ/mol   
17
8.62 kJ/mol   
40
Enthalpy of Atomization
247.00 kJ/mol   
99+
209.00 kJ/mol   
99+
Standard Molar Entropy
74.00 J/mol.K   
9
69.60 J/mol.K   
15
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