Terbium vs Lead
Periodic Table
Symbol
Tb
Pb
Group Number
Not Available
14
4
Period Number
6
6
Block
f block
p block
Element Family
Lanthanide
Post-Transition
CAS Number
7440279
99+
7439921
99+
Space Group Name
P63/mmc
Fm_ 3m
Space Group Number
194.00
5
225.00
2
Facts
Interesting Facts
- At times Terbium metal acts same as Calcium.
- Terbium metal closely similar to Lanthanum metal.
- Galena mineral contains almost 87% of Lead metal in it, Galena is sulfide mineral.
- The best available source of Lead metal today is by recycling automobile batteries.
Sources
Found in Minerals, Found with Other Rare Earth Metals, Mining, Ores of Minerals
Earth's crust, Found in Minerals, Mining, Ores of metals, Ores of Minerals
History
Who Discovered
Carl Gustaf Mosander
Unknown
Discovery
In 1842
In Middle Easterns (7000 BCE)
Abundance
Abundance In Universe
5 * 10-8 %
27
1 * 10-6 %
16
Abundance In Sun
~0.00000001 %
29
~0.000001 %
18
Abundance In Meteorites
0.00 %
99+
0.00 %
23
Abundance In Earth's Crust
0.00 %
40
0.00 %
26
Abundance In Oceans
0.00 %
99+
0.00 %
22
Abundance In Humans
Not Available
0.00 %
8
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 is also used in insecticides, hair dyes and as an anti-knocking additive for petrol. But all these are banned by the government as Lead metal is known for detrimental to health.
Industrial Uses
Electronic Industry
Chemical Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
Surgical Instruments Manufacturing
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Low Toxic
Toxic
Present in Human Body
No
Yes
In Blood
Not Available
0.21 Blood/mg dm-3
11
In Bone
Not Available
30.00 p.p.m.
10
Physical Properties
Melting Point
1,356.00 °C
33
327.50 °C
99+
Boiling Point
3,123.00 °C
29
1,740.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery White
Gray
Luster
Metallic
Metallic
Hardness
Mohs Hardness
Not Available
1.50
18
Brinell Hardness
677.00 MPa
17
38.00 MPa
99+
Vickers Hardness
863.00 MPa
13
Not Available
Speed of Sound
2,620.00 m/s
35
1,190.00 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
Tb
Pb
Isotopes
Known Isotopes
26
13
35
4
Electronegativity
Pauling Electronegativity
Not Available
1.87
13
Sanderson Electronegativity
Not Available
2.29
4
Allred Rochow Electronegativity
1.10
30
1.55
11
Mulliken-Jaffe Electronegativity
Not Available
2.41
2
Allen Electronegativity
Not Available
1.85
8
Electropositivity
Pauling Electropositivity
Not Available
1.67
99+
Ionization Energies
1st Energy Level
603.40 kJ/mol
99+
715.60 kJ/mol
31
2nd Energy Level
1,174.80 kJ/mol
99+
1,450.50 kJ/mol
99+
3rd Energy Level
2,417.00 kJ/mol
99+
3,081.50 kJ/mol
23
4th Energy Level
4,203.00 kJ/mol
31
4,083.00 kJ/mol
35
5th Energy Level
Not Available
6,640.00 kJ/mol
20
Electrochemical Equivalent
1.98 g/amp-hr
31
3.87 g/amp-hr
9
Electron Work Function
3.00 eV
36
4.25 eV
21
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility
Anti Corrosion, Ionization, Radioactive Isotopes
Atomic Properties
Atomic Number
65
99+
82
34
Electron Configuration
[Xe] 4f9 6s2
[Xe] 4f14 5d10 6s2 6p2
Crystal Structure
Hexagonal Close Packed (HCP)
Face Centered Cubic (FCC)
Crystal Lattice
HCP-Crystal-Structure-of-Terbium.jpg#100
FCC-Crystal-Structure-of-Lead.jpg#100
Atom
Number of Protons
65
99+
82
34
Number of Neutrons
94
36
125
19
Number of Electrons
65
99+
82
34
Radius of an Atom
Atomic Radius
177.00 pm
17
175.00 pm
19
Covalent Radius
194.00 pm
16
146.00 pm
38
Van der Waals Radius
221.00 pm
22
202.00 pm
27
Atomic Weight
158.93 amu
99+
207.20 amu
30
Atomic Volume
19.20 cm3/mol
22
18.17 cm3/mol
27
Adjacent Atomic Numbers
Valence Electron Potential
46.80 (-eV)
33
24.20 (-eV)
99+
Lattice Constant
360.10 pm
36
495.08 pm
16
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
1.58
13
Not Available
Mechanical Properties
Density
Density At Room Temperature
8.23 g/cm3
99+
11.34 g/cm3
33
Density When Liquid (at m.p.)
7.65 g/cm3
30
10.66 g/cm3
15
Tensile Strength
60.00 MPa
17
12.00 MPa
20
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
29
1.64 (Pa)
7
Vapor Pressure at 2000 K
12.50 (Pa)
8
Not Available
Elasticity properties
Shear Modulus
22.10 GPa
32
5.60 GPa
99+
Bulk Modulus
38.70 GPa
33
46.00 GPa
24
Young's Modulus
55.70 GPa
34
16.00 GPa
99+
Poisson Ratio
0.26
21
0.44
3
Other Mechanical Properties
Ductile, Malleable
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
8.23
39
11.35
25
Magnetic Ordering
Paramagnetic
Diamagnetic
Electrical Properties
Electrical Property
Conductor
Poor Conductor
Resistivity
1.15 nΩ·m
99+
208.00 nΩ·m
16
Electrical Conductivity
0.01 106/cm Ω
99+
0.05 106/cm Ω
36
Electron Affinity
50.00 kJ/mol
21
35.10 kJ/mol
28
Thermal Properties
Specific Heat
0.18 J/(kg K)
33
0.13 J/(kg K)
39
Molar Heat Capacity
28.91 J/mol·K
9
26.65 J/mol·K
26
Thermal Conductivity
11.10 W/m·K
99+
35.30 W/m·K
38
Critical Temperature
Not Available
Not Available
Thermal Expansion
10.30 µm/(m·K)
38
28.90 µm/(m·K)
13
Enthalpy
Enthalpy of Vaporization
330.90 kJ/mol
26
179.40 kJ/mol
99+
Enthalpy of Fusion
10.80 kJ/mol
34
4.77 kJ/mol
99+
Enthalpy of Atomization
314.00 kJ/mol
33
194.60 kJ/mol
99+
Standard Molar Entropy
73.20 J/mol.K
10
64.80 J/mol.K
17
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