Terbium Technetium Comparison
Periodic Table
Symbol
Tb
Tc
Group Number
Not Available
7
11
Period Number
6
5
Block
f block
d block
Element Family
Lanthanide
Transition Metal
CAS Number
7440279
99+
7440268
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.
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
Sources
Found in Minerals, Found with Other Rare Earth Metals, Mining, Ores of Minerals
Made by Bombarding Molybdenum with Deuterons
History
Who Discovered
Carl Gustaf Mosander
Emilio Segrè and Carlo Perriero
Discovery
In 1842
In 1937
Abundance
Abundance In Universe
5 * 10-8 %
27
Not Available
Abundance In Sun
~0.00000001 %
29
~-9999 %
Abundance In Meteorites
0.00 %
99+
Not Available
Abundance In Earth's Crust
0.00 %
40
Not Available
Abundance In Oceans
0.00 %
99+
Not Available
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.
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
Industrial Uses
Electronic Industry
NA
Medical Uses
NA
NA
Other Uses
Alloys
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Low Toxic
Low Toxic
Present in Human Body
No
No
In Blood
Not Available
0.00 Blood/mg dm-3
37
In Bone
Not Available
0.00 p.p.m.
36
Physical Properties
Melting Point
1,356.00 °C
33
2,200.00 °C
9
Boiling Point
3,123.00 °C
29
4,877.00 °C
7
Appearance
Physical State
Solid
Solid
Color
Silvery White
Shiny Gray
Luster
Metallic
NA
Hardness
Brinell Hardness
677.00 MPa
17
Not Available
Vickers Hardness
863.00 MPa
13
Not Available
Speed of Sound
2,620.00 m/s
35
16,200.00 m/s
1
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
Tc
Isotopes
Known Isotopes
26
13
18
21
Electronegativity
Pauling Electronegativity
Not Available
1.90
11
Allred Rochow Electronegativity
1.10
30
1.36
20
Allen Electronegativity
Not Available
1.51
28
Electropositivity
Pauling Electropositivity
Not Available
2.10
99+
Ionization Energies
1st Energy Level
603.40 kJ/mol
99+
702.00 kJ/mol
36
2nd Energy Level
1,174.80 kJ/mol
99+
1,470.00 kJ/mol
99+
3rd Energy Level
2,417.00 kJ/mol
99+
2,850.00 kJ/mol
33
4th Energy Level
4,203.00 kJ/mol
31
Not Available
Electrochemical Equivalent
1.98 g/amp-hr
31
0.52 g/amp-hr
99+
Electron Work Function
3.00 eV
36
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
65
99+
43
99+
Electron Configuration
[Xe] 4f9 6s2
[Kr] 4d5 5s2
Crystal Structure
Hexagonal Close Packed (HCP)
Hexagonal Close Packed (HCP)
Crystal Lattice
HCP-Crystal-Structure-of-Terbium.jpg#100
HCP-Crystal-Structure-of-Technetium.jpg#100
Atom
Number of Protons
65
99+
43
99+
Number of Neutrons
94
36
55
99+
Number of Electrons
65
99+
43
99+
Radius of an Atom
Atomic Radius
177.00 pm
17
136.00 pm
99+
Covalent Radius
194.00 pm
16
147.00 pm
37
Van der Waals Radius
221.00 pm
22
200.00 pm
28
Atomic Weight
158.93 amu
99+
98.00 amu
99+
Atomic Volume
19.20 cm3/mol
22
8.50 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
46.80 (-eV)
33
180.00 (-eV)
3
Lattice Constant
360.10 pm
36
273.50 pm
99+
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, 2 π/3
Lattice C/A Ratio
1.58
13
1.60
5
Mechanical Properties
Density
Density At Room Temperature
8.23 g/cm3
99+
11.00 g/cm3
34
Density When Liquid (at m.p.)
7.65 g/cm3
30
Not Available
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
Not Available
Elasticity properties
Shear Modulus
22.10 GPa
32
Not Available
Bulk Modulus
38.70 GPa
33
Not Available
Young's Modulus
55.70 GPa
34
Not Available
Poisson Ratio
0.26
21
Not Available
Other Mechanical Properties
Ductile, Malleable
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
8.23
39
11.50
24
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
1.15 nΩ·m
99+
200.00 nΩ·m
18
Electrical Conductivity
0.01 106/cm Ω
99+
0.07 106/cm Ω
30
Electron Affinity
50.00 kJ/mol
21
53.00 kJ/mol
18
Thermal Properties
Specific Heat
0.18 J/(kg K)
33
0.21 J/(kg K)
29
Molar Heat Capacity
28.91 J/mol·K
9
24.27 J/mol·K
99+
Thermal Conductivity
11.10 W/m·K
99+
50.60 W/m·K
30
Critical Temperature
Not Available
Not Available
Thermal Expansion
10.30 µm/(m·K)
38
7.10 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
330.90 kJ/mol
26
660.00 kJ/mol
6
Enthalpy of Fusion
10.80 kJ/mol
34
23.01 kJ/mol
9
Enthalpy of Atomization
314.00 kJ/mol
33
649.00 kJ/mol
8
Standard Molar Entropy
73.20 J/mol.K
10
181.10 J/mol.K
2
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