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Technetium vs Promethium

Technetium
Promethium
Promethium vs Technetium


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
  
  
Previous Element
Molybdenum
  
Neodymium
  
Next Element
Ruthenium
  
Samarium
  
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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