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Protactinium vs Technetium

Protactinium
Technetium
Technetium vs Protactinium


Periodic Table
Symbol
Pa   
Tc   
Group Number
Not Available   
7   
11
Period Number
7   
5   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440133   
99+
7440268   
99+
Space Group Name
I4/mmm   
P63/mmc   
Space Group Number
139.00   
8
194.00   
5
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
Sources
Found in Uranium Ores, Mining, Ores of metals   
Made by Bombarding Molybdenum with Deuterons   
History
  
  
Who Discovered
William Crookes   
Emilio Segrè and Carlo Perriero   
Discovery
In 1900   
In 1937   
Abundance
  
  
Abundance In Earth's Crust
0.00 %   
99+
Not Available   
Abundance In Oceans
0.00 %   
99+
Not Available   
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Highly Toxic   
Low 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
0.00 p.p.m.   
36
Physical Properties
Melting Point
1,568.00 °C   
21
2,200.00 °C   
9
Boiling Point
4,027.00 °C   
12
4,877.00 °C   
7
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Shiny Gray   
Luster
Metallic   
NA   
Hardness
  
  
Speed of Sound
Not Available   
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
Pa   
Tc   
Isotopes
  
  
Known Isotopes
27   
12
18   
21
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
1.90   
11
Allred Rochow Electronegativity
1.14   
28
1.36   
20
Allen Electronegativity
Not Available   
1.51   
28
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
2.10   
99+
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
702.00 kJ/mol   
36
2nd Energy Level
1,128.00 kJ/mol   
99+
1,470.00 kJ/mol   
99+
3rd Energy Level
1,814.00 kJ/mol   
99+
2,850.00 kJ/mol   
33
4th Energy Level
2,991.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.72 g/amp-hr   
99+
0.52 g/amp-hr   
99+
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
91   
27
43   
99+
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Kr] 4d5 5s2   
Crystal Structure
Tetragonal (TETR)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
HCP-Crystal-Structure-of-Technetium.jpg#100   
Atom
  
  
Number of Protons
91   
27
43   
99+
Number of Neutrons
122   
21
55   
99+
Number of Electrons
91   
27
43   
99+
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
136.00 pm   
99+
Covalent Radius
200.00 pm   
11
147.00 pm   
37
Van der Waals Radius
243.00 pm   
11
200.00 pm   
28
Atomic Weight
231.04 amu   
24
98.00 amu   
99+
Atomic Volume
15.00 cm3/mol   
34
8.50 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Molybdenum
  
Next Element
Uranium
  
Ruthenium
  
Valence Electron Potential
92.00 (-eV)   
11
180.00 (-eV)   
3
Lattice Constant
392.50 pm   
23
273.50 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.60   
5
Mechanical Properties
Density
  
  
Density At Room Temperature
15.37 g/cm3   
20
11.00 g/cm3   
34
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Unknown   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
15.37   
12
11.50   
24
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
177.00 nΩ·m   
21
200.00 nΩ·m   
18
Electrical Conductivity
0.05 106/cm Ω   
34
0.07 106/cm Ω   
30
Electron Affinity
Not Available   
53.00 kJ/mol   
18
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.21 J/(kg K)   
29
Molar Heat Capacity
Not Available   
24.27 J/mol·K   
99+
Thermal Conductivity
47.00 W/m·K   
32
50.60 W/m·K   
30
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
9.90 µm/(m·K)   
40
7.10 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
660.00 kJ/mol   
6
Enthalpy of Fusion
12.34 kJ/mol   
28
23.01 kJ/mol   
9
Enthalpy of Atomization
Not Available   
649.00 kJ/mol   
8
Standard Molar Entropy
198.10 J/mol.K   
1
181.10 J/mol.K   
2
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