Terbium Lanthanum Comparison
Periodic Table
Symbol
Tb
La
Group Number
Not Available
Not Available
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
5
194.00
5
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
5 * 10-8 %
27
2 * 10-7 %
22
Abundance In Sun
~0.00000001 %
29
~0.0000002 %
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
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
NA
NA
Other Uses
Alloys
Alloys, Mirror Manufacturing
Biological Properties
Toxicity
Low Toxic
Low Toxic
Present in Human Body
No
Yes
In Bone
Not Available
0.08 p.p.m.
24
Physical Properties
Melting Point
1,356.00 °C
33
920.00 °C
99+
Boiling Point
3,123.00 °C
29
3,469.00 °C
18
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery White
Luster
Metallic
NA
Hardness
Mohs Hardness
Not Available
2.50
14
Brinell Hardness
677.00 MPa
17
350.00 MPa
30
Vickers Hardness
863.00 MPa
13
360.00 MPa
26
Speed of Sound
2,620.00 m/s
35
2,475.00 m/s
37
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
Tb
La
Isotopes
Known Isotopes
26
13
31
8
Electronegativity
Pauling Electronegativity
Not Available
1.10
99+
Allred Rochow Electronegativity
1.10
30
1.08
31
Electropositivity
Pauling Electropositivity
Not Available
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
31
4,819.00 kJ/mol
22
5th Energy Level
Not Available
5,940.00 kJ/mol
25
Electrochemical Equivalent
1.98 g/amp-hr
31
1.73 g/amp-hr
99+
Electron Work Function
3.00 eV
36
3.50 eV
31
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility
Ionization, Radioactive Isotopes, Solubility
Atomic Properties
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
36
82
99+
Number of Electrons
65
99+
57
99+
Radius of an Atom
Atomic Radius
177.00 pm
17
187.00 pm
8
Covalent Radius
194.00 pm
16
207.00 pm
6
Van der Waals Radius
221.00 pm
22
240.00 pm
13
Atomic Weight
158.93 amu
99+
138.91 amu
99+
Atomic Volume
19.20 cm3/mol
22
20.73 cm3/mol
16
Adjacent Atomic Numbers
Valence Electron Potential
46.80 (-eV)
33
40.71 (-eV)
99+
Lattice Constant
360.10 pm
36
377.20 pm
28
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, 2 π/3
Lattice C/A Ratio
1.58
13
1.62
2
Mechanical Properties
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
30
5.94 g/cm3
99+
Tensile Strength
60.00 MPa
17
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
29
Not Available
Vapor Pressure at 2000 K
12.50 (Pa)
8
0.98 (Pa)
15
Elasticity properties
Shear Modulus
22.10 GPa
32
14.30 GPa
40
Bulk Modulus
38.70 GPa
33
27.90 GPa
99+
Young's Modulus
55.70 GPa
34
36.60 GPa
99+
Poisson Ratio
0.26
21
0.28
17
Other Mechanical Properties
Ductile, Malleable
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
8.23
39
6.17
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
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
21
48.00 kJ/mol
23
Thermal Properties
Specific Heat
0.18 J/(kg K)
33
0.19 J/(kg K)
32
Molar Heat Capacity
28.91 J/mol·K
9
27.11 J/mol·K
21
Thermal Conductivity
11.10 W/m·K
99+
13.40 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
10.30 µm/(m·K)
38
12.10 µm/(m·K)
32
Enthalpy
Enthalpy of Vaporization
330.90 kJ/mol
26
399.60 kJ/mol
17
Enthalpy of Fusion
10.80 kJ/mol
34
6.20 kJ/mol
99+
Enthalpy of Atomization
314.00 kJ/mol
33
431.00 kJ/mol
16
Standard Molar Entropy
73.20 J/mol.K
10
56.90 J/mol.K
23
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