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Terbium vs Lanthanum

Terbium
Lanthanum
Lanthanum vs Terbium


Periodic Table
Symbol
Tb  
La  
Group Number
3  
15
3  
15
Period Number
6  
6  
Block
f block  
f block  
Element Family
Lanthanide  
Lanthanide  
CAS Number
7440279  
99+
7439910  
99+
Space Group Name
P63/mmc  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • At times Terbium metal acts same as Calcium.
  • Terbium metal closely similar to Lanthanum metal.
  
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
  
Sources
Found in Minerals, Found with Other Rare Earth Metals, Mining, Ores of Minerals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Carl Gustaf Mosander  
Carl Gustaf Mosander  
Discovery
In 1842  
In 1838  
Abundance
  
  
Abundance In Universe
0.00 %  
28
0.00 %  
23
Abundance In Sun
0.00 %  
29
0.00 %  
25
Abundance In Meteorites
0.00 %  
99+
0.00 %  
32
Abundance In Earth's Crust
0.00 %  
40
0.00 %  
19
Abundance In Oceans
0.00 %  
99+
0.00 %  
29
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Terbium salts are used in optical devices like laser devices.
  • Terbium’s alloy lengthens and shortens the magnetic field and this effect forms loudspeaker.
  
  • 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.
  
Industrial Uses
Electronic Industry  
Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys, Mirror Manufacturing  
Biological Properties
  
  
Toxicity
Low Toxic  
Low Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
37
0.00 Blood/mg dm-3  
32
In Bone
0.00 p.p.m.  
99+
0.08 p.p.m.  
29
Physical
Melting Point
1,356.00 °C  
33
920.00 °C  
99+
Boiling Point
3,123.00 °C  
30
3,469.00 °C  
19
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
-  
Hardness
  
  
Mohs Hardness
1.50  
19
2.50  
15
Brinell Hardness
677.00 MPa  
19
350.00 MPa  
36
Vickers Hardness
863.00 MPa  
20
360.00 MPa  
99+
Speed of Sound
2,620.00 m/s  
99+
2,475.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.60  
32
1.80  
22
Reflectivity
35.00 %  
34
70.00 %  
13
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Tb  
La  
Isotopes
  
  
Known Isotopes
26  
13
31  
8
Electronegativity
  
  
Pauling Electronegativity
1.20  
40
1.10  
99+
Sanderson Electronegativity
1.20  
32
1.10  
38
Allred Rochow Electronegativity
1.10  
31
1.08  
32
Mulliken-Jaffe Electronegativity
1.20  
39
1.10  
99+
Allen Electronegativity
1.20  
99+
1.10  
99+
Electropositivity
  
  
Pauling Electropositivity
2.20  
39
2.90  
10
Ionization Energies
  
  
1st Energy Level
603.40 kJ/mol  
99+
538.10 kJ/mol  
99+
2nd Energy Level
1,174.80 kJ/mol  
99+
1,067.00 kJ/mol  
99+
3rd Energy Level
2,417.00 kJ/mol  
99+
1,850.30 kJ/mol  
99+
4th Energy Level
4,203.00 kJ/mol  
99+
4,819.00 kJ/mol  
32
5th Energy Level
5,658.00 kJ/mol  
99+
5,940.00 kJ/mol  
99+
6th Energy Level
5,658.00 kJ/mol  
99+
5,380.00 kJ/mol  
99+
7th Energy level
5,420.00 kJ/mol  
99+
5,380.00 kJ/mol  
99+
8th Energy Level
5,650.00 kJ/mol  
99+
5,380.00 kJ/mol  
99+
9th Energy Level
5,650.00 kJ/mol  
99+
5,380.00 kJ/mol  
99+
10th Energy Level
5,650.00 kJ/mol  
99+
5,380.00 kJ/mol  
99+
11th Energy Level
5,650.00 kJ/mol  
99+
5,380.00 kJ/mol  
99+
12th Energy Level
5,650.00 kJ/mol  
99+
5,380.00 kJ/mol  
99+
13th Energy Level
5,650.00 kJ/mol  
99+
5,380.00 kJ/mol  
99+
14th Energy Level
5,650.00 kJ/mol  
99+
5,380.00 kJ/mol  
99+
15th Energy Level
56,500.00 kJ/mol  
99+
53,800.00 kJ/mol  
99+
16th Energy Level
56,500.00 kJ/mol  
99+
53,800.00 kJ/mol  
99+
17th Energy Level
565.80 kJ/mol  
99+
538.10 kJ/mol  
99+
18th Energy Level
5,658.00 kJ/mol  
99+
5,380.00 kJ/mol  
99+
19th Energy Level
565.00 kJ/mol  
99+
538.10 kJ/mol  
99+
20th Energy Level
565.00 kJ/mol  
99+
538.00 kJ/mol  
99+
21st Energy Level
565.80 kJ/mol  
99+
538.10 kJ/mol  
99+
22nd Energy Level
565.00 kJ/mol  
99+
538.00 kJ/mol  
99+
23rd Energy Level
565.80 kJ/mol  
99+
5,380.00 kJ/mol  
25
24th Energy Level
565.80 kJ/mol  
99+
538.00 kJ/mol  
99+
25th Energy Level
565.00 kJ/mol  
99+
538.00 kJ/mol  
99+
26th Energy Level
565.80 kJ/mol  
99+
538.00 kJ/mol  
99+
27th Energy Level
565.80 kJ/mol  
99+
538.10 kJ/mol  
99+
28th Energy Level
565.80 kJ/mol  
99+
538.00 kJ/mol  
99+
29th Energy Level
565.80 kJ/mol  
99+
538.10 kJ/mol  
99+
30th Energy Level
565.00 kJ/mol  
99+
538.00 kJ/mol  
99+
Electrochemical Equivalent
1.98 g/amp-hr  
35
1.73 g/amp-hr  
99+
Electron Work Function
3.00 eV  
99+
3.50 eV  
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
65  
99+
57  
99+
Electron Configuration
[Xe] 4f9 6s2  
[Xe] 5d2 6s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
HCP-Crystal-Structure-of-Terbium.jpg#100  
DHCP-Crystal-Structure-of-Lanthanum.jpg#100  
Atom
  
  
Number of Protons
65  
99+
57  
99+
Number of Neutrons
94  
37
82  
99+
Number of Electrons
65  
99+
57  
99+
Radius of an Atom
  
  
Atomic Radius
177.00 pm  
19
187.00 pm  
10
Covalent Radius
194.00 pm  
16
207.00 pm  
6
Van der Waals Radius
221.00 pm  
27
240.00 pm  
17
Atomic Weight
158.93 amu  
99+
138.91 amu  
99+
Atomic Volume
19.20 cm3/mol  
34
20.73 cm3/mol  
26
Adjacent Atomic Numbers
  
  
Previous Element
Gadolinium
  
Barium
  
Next Element
Dysprosium
  
Cerium
  
Valence Electron Potential
46.80 (-eV)  
34
40.71 (-eV)  
99+
Lattice Constant
360.10 pm  
40
377.20 pm  
31
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.58  
35
1.62  
16
Mechanical
Density
  
  
Density At Room Temperature
8.23 g/cm3  
99+
6.16 g/cm3  
99+
Density When Liquid (at m.p.)
7.65 g/cm3  
99+
5.94 g/cm3  
99+
Tensile Strength
60.00 MPa  
35
45.00 MPa  
40
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
31
0.00 (Pa)  
22
Vapor Pressure at 2000 K
12.50 (Pa)  
8
0.98 (Pa)  
15
Elasticity properties
  
  
Shear Modulus
22.10 GPa  
99+
14.30 GPa  
99+
Bulk Modulus
38.70 GPa  
40
27.90 GPa  
99+
Young's Modulus
55.70 GPa  
37
36.60 GPa  
99+
Poisson Ratio
0.26  
21
0.28  
17
Other Mechanical Properties
Ductile, Malleable  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
8.23  
99+
6.17  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
15
Susceptibility
0.00  
24
0.00  
25
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
1.15 nΩ·m  
99+
615.00 nΩ·m  
7
Electrical Conductivity
0.01 106/cm Ω  
99+
0.01 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
48.00 kJ/mol  
28
Thermal
Specific Heat
0.18 J/(kg K)  
34
0.19 J/(kg K)  
33
Molar Heat Capacity
28.91 J/mol·K  
12
27.11 J/mol·K  
27
Thermal Conductivity
11.10 W/m·K  
99+
13.40 W/m·K  
99+
Critical Temperature
1,629.00 K  
37
1,193.00 K  
99+
Thermal Expansion
10.30 µm/(m·K)  
99+
12.10 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
330.90 kJ/mol  
99+
399.60 kJ/mol  
24
Enthalpy of Fusion
10.80 kJ/mol  
40
6.20 kJ/mol  
99+
Enthalpy of Atomization
314.00 kJ/mol  
99+
431.00 kJ/mol  
21
Standard Molar Entropy
73.20 J/mol.K  
10
56.90 J/mol.K  
31
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