Technetium vs Promethium
Periodic Table
Symbol
Tc
Pm
Group Number
7
11
Not Available
Period Number
5
6
Block
d block
f block
Element Family
Transition Metal
Lanthanide
CAS Number
7440268
99+
7440122
99+
Space Group Name
P63/mmc
Not Available
Space Group Number
194.00
5
Not Available
Facts
Interesting Facts
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
- Promethium metal found in Pitchblende.
- Promethium metal is highly radioactive metal.
Sources
Made by Bombarding Molybdenum with Deuterons
Found in Minerals, Mining
History
Who Discovered
Emilio Segrè and Carlo Perriero
Chien Shiung Wu, Emilio Segrè, Hans Bethe
Discovery
In 1937
In 1942
Abundance
Uses
Uses & Benefits
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
- It is used for research purpose. Very small amount of this metal is used in atomic batteries.
- Its radioactive decay is used for a phosphor to give off light. The light emitted is converted into electricity.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
Alloys, Nuclear Research, Research Purposes
NA
Biological Properties
Toxicity
Low Toxic
Non Toxic
Present in Human Body
No
No
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
37
In Bone
0.00 p.p.m.
36
Not Available
Physical Properties
Melting Point
2,200.00 °C
9
1,042.00 °C
99+
Boiling Point
4,877.00 °C
7
3,000.00 °C
31
Appearance
Physical State
Solid
Solid
Color
Shiny Gray
Unknown
Luster
NA
Metallic
Hardness
Speed of Sound
16,200.00 m/s
1
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
Tc
Pm
Isotopes
Known Isotopes
18
21
27
12
Electronegativity
Pauling Electronegativity
1.90
11
Not Available
Allred Rochow Electronegativity
1.36
20
1.07
32
Allen Electronegativity
1.51
28
Not Available
Electropositivity
Pauling Electropositivity
2.10
99+
Not Available
Ionization Energies
1st Energy Level
702.00 kJ/mol
36
540.00 kJ/mol
99+
2nd Energy Level
1,470.00 kJ/mol
99+
1,050.00 kJ/mol
99+
3rd Energy Level
2,850.00 kJ/mol
33
2,150.00 kJ/mol
99+
4th Energy Level
Not Available
3,970.00 kJ/mol
38
Electrochemical Equivalent
0.52 g/amp-hr
99+
1.80 g/amp-hr
36
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Ionization, Radioactive Isotopes, Solubility
Atomic Properties
Atomic Number
43
99+
61
99+
Electron Configuration
[Kr] 4d5 5s2
[Xe] 4f5 6s2
Crystal Structure
Hexagonal Close Packed (HCP)
Double Hexagonal Close Packed (DHCP)
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100
DHCP-Crystal-Structure-of-Promethium.jpg#100
Atom
Number of Protons
43
99+
61
99+
Number of Neutrons
55
99+
84
40
Number of Electrons
43
99+
61
99+
Radius of an Atom
Atomic Radius
136.00 pm
99+
183.00 pm
10
Covalent Radius
147.00 pm
37
199.00 pm
12
Van der Waals Radius
200.00 pm
28
236.00 pm
16
Atomic Weight
98.00 amu
99+
145.00 amu
99+
Atomic Volume
8.50 cm3/mol
99+
22.39 cm3/mol
12
Adjacent Atomic Numbers
Valence Electron Potential
180.00 (-eV)
3
44.10 (-eV)
39
Lattice Constant
273.50 pm
99+
Not Available
Lattice Angles
π/2, π/2, 2 π/3
Unknown
Lattice C/A Ratio
1.60
5
Not Available
Mechanical Properties
Density
Density At Room Temperature
11.00 g/cm3
34
7.26 g/cm3
99+
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Shear Modulus
Not Available
18.00 GPa
36
Bulk Modulus
Not Available
33.00 GPa
36
Young's Modulus
Not Available
46.00 GPa
38
Poisson Ratio
Not Available
0.28
17
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
11.50
24
7.26
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
200.00 nΩ·m
18
0.75 nΩ·m
99+
Electrical Conductivity
0.07 106/cm Ω
30
Not Available
Electron Affinity
53.00 kJ/mol
18
50.00 kJ/mol
21
Thermal Properties
Specific Heat
0.21 J/(kg K)
29
0.18 J/(kg K)
33
Molar Heat Capacity
24.27 J/mol·K
99+
Not Available
Thermal Conductivity
50.60 W/m·K
30
17.90 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
7.10 µm/(m·K)
99+
9.00 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
660.00 kJ/mol
6
Not Available
Enthalpy of Fusion
23.01 kJ/mol
9
7.50 kJ/mol
99+
Enthalpy of Atomization
649.00 kJ/mol
8
310.00 kJ/mol
34
Standard Molar Entropy
181.10 J/mol.K
2
Not Available
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