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Lanthanum vs Thulium

Lanthanum
Thulium
Thulium vs Lanthanum


Periodic Table
Symbol
La  
Tm  
Group Number
Not Available  
Not Available  
Period Number
6  
6  
Block
f block  
f block  
Element Family
Lanthanide  
Lanthanide  
CAS Number
7439910  
99+
7440304  
99+
Space Group Name
P63/mmc  
P63/mmc  
Space Group Number
194.00  
5
194.00  
5
Facts
Interesting Facts
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
  
  • Thulium metal can resist corrosion due to dry air .
  • Only Tm-169 isotope of Thulium metal occur naturally.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Carl Gustaf Mosander  
Per Teodor Cleve  
Discovery
In 1838  
In 1879  
Abundance
  
  
Abundance In Universe
2 * 10-7 %  
22
1 * 10-8 %  
30
Abundance In Sun
~0.0000002 %  
25
~0.00000002 %  
28
Abundance In Meteorites
0.00 %  
32
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
19
0.00 %  
99+
Abundance In Oceans
0.00 %  
29
0.00 %  
99+
Uses
Uses & Benefits
  • It has no commercial uses, but its alloys are in high demand. Lanthanum and Nickel alloy is used for the hydrogen gas storage.
  • The best-known use for mischmetal alloy of Lanthanum is; as a ‘flints’ for cigarette lighters.
  
  • 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.
  
Industrial Uses
Electrical Industry, Electronic Industry  
NA  
Medical Uses
NA  
NA  
Other Uses
Alloys, Mirror Manufacturing  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
Low Toxic  
Unknown  
Present in Human Body
Yes  
No  
In Bone
0.08 p.p.m.  
24
Not Available  
Physical Properties
Melting Point
920.00 °C  
99+
1,545.00 °C  
23
Boiling Point
3,469.00 °C  
18
1,730.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery Gray  
Luster
NA  
Metallic  
Hardness
  
  
Mohs Hardness
2.50  
14
Not Available  
Brinell Hardness
350.00 MPa  
30
471.00 MPa  
25
Vickers Hardness
360.00 MPa  
26
520.00 MPa  
21
Speed of Sound
2,475.00 m/s  
37
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
La  
Tm  
Isotopes
  
  
Known Isotopes
31  
8
32  
7
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
1.25  
35
Allred Rochow Electronegativity
1.08  
31
1.11  
29
Electropositivity
  
  
Pauling Electropositivity
2.90  
10
2.75  
19
Ionization Energies
  
  
1st Energy Level
538.10 kJ/mol  
99+
596.70 kJ/mol  
99+
2nd Energy Level
1,067.00 kJ/mol  
99+
1,160.00 kJ/mol  
99+
3rd Energy Level
1,850.30 kJ/mol  
99+
2,285.00 kJ/mol  
99+
4th Energy Level
4,819.00 kJ/mol  
22
4,120.00 kJ/mol  
33
5th Energy Level
5,940.00 kJ/mol  
25
Not Available  
Electrochemical Equivalent
1.73 g/amp-hr  
99+
2.10 g/amp-hr  
26
Electron Work Function
3.50 eV  
31
Not Available  
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Solubility  
Atomic Properties
Atomic Number
57  
99+
69  
99+
Electron Configuration
[Xe] 5d2 6s2  
[Xe] 4f13 6s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100  
HCP-Crystal-Structure-of-Thulium.jpg#100  
Atom
  
  
Number of Protons
57  
99+
69  
99+
Number of Neutrons
82  
99+
100  
32
Number of Electrons
57  
99+
69  
99+
Radius of an Atom
  
  
Atomic Radius
187.00 pm  
8
176.00 pm  
18
Covalent Radius
207.00 pm  
6
160.00 pm  
30
Van der Waals Radius
240.00 pm  
13
Not Available  
Atomic Weight
138.91 amu  
99+
168.93 amu  
99+
Atomic Volume
20.73 cm3/mol  
16
18.10 cm3/mol  
28
Adjacent Atomic Numbers
  
  
Previous Element
Barium
  
Erbium
  
Next Element
Cerium
  
Ytterbium
  
Valence Electron Potential
40.71 (-eV)  
99+
49.70 (-eV)  
28
Lattice Constant
377.20 pm  
28
353.75 pm  
40
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.62  
2
1.57  
17
Mechanical Properties
Density
  
  
Density At Room Temperature
6.16 g/cm3  
99+
9.32 g/cm3  
40
Density When Liquid (at m.p.)
5.94 g/cm3  
99+
8.56 g/cm3  
24
Tensile Strength
Not Available  
Not Available  
Viscosity
Not Available  
Not Available  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available  
0.06 (Pa)  
10
Vapor Pressure at 2000 K
0.98 (Pa)  
15
Not Available  
Elasticity properties
  
  
Shear Modulus
14.30 GPa  
40
30.50 GPa  
22
Bulk Modulus
27.90 GPa  
99+
44.50 GPa  
26
Young's Modulus
36.60 GPa  
99+
74.00 GPa  
27
Poisson Ratio
0.28  
17
0.21  
31
Other Mechanical Properties
Ductile  
Ductile, Malleable  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
6.17  
99+
9.32  
31
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
615.00 nΩ·m  
7
676.00 nΩ·m  
5
Electrical Conductivity
0.01 106/cm Ω  
99+
0.02 106/cm Ω  
99+
Electron Affinity
48.00 kJ/mol  
23
50.00 kJ/mol  
21
Thermal Properties
Specific Heat
0.19 J/(kg K)  
32
0.16 J/(kg K)  
35
Molar Heat Capacity
27.11 J/mol·K  
21
27.03 J/mol·K  
22
Thermal Conductivity
13.40 W/m·K  
99+
16.90 W/m·K  
99+
Critical Temperature
Not Available  
Not Available  
Thermal Expansion
12.10 µm/(m·K)  
32
13.30 µm/(m·K)  
29
Enthalpy
  
  
Enthalpy of Vaporization
399.60 kJ/mol  
17
191.00 kJ/mol  
99+
Enthalpy of Fusion
6.20 kJ/mol  
99+
16.80 kJ/mol  
17
Enthalpy of Atomization
431.00 kJ/mol  
16
247.00 kJ/mol  
99+
Standard Molar Entropy
56.90 J/mol.K  
23
74.00 J/mol.K  
9
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