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Protactinium vs Thorium

Protactinium
Thorium
Thorium vs Protactinium


Periodic Table
Symbol
Pa   
Th   
Group Number
Not Available   
0   
18
Period Number
7   
7   
Block
f block   
f block   
Element Family
Actinide   
Actinide   
CAS Number
7440133   
99+
7440326   
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.
  
  • Thorium metal is used as an alternate option over Uranium for nuclear fuel.
  • Thorium metals appearance (silvery white, soft) is somewhat similar to Lead metal.
  
Sources
Found in Uranium Ores, Mining, Ores of metals   
Found in Minerals, Mining   
History
  
  
Who Discovered
William Crookes   
Jöns Jakob Berzelius   
Discovery
In 1900   
In 1829   
Abundance
  
  
Abundance In Universe
Not Available   
3 * 10-4 %   
9
Abundance In Sun
~-9999 %   
~0.0004 %   
9
Abundance In Meteorites
Not Available   
0.05 %   
11
Abundance In Earth's Crust
0.00 %   
99+
0.66 %   
7
Abundance In Oceans
0.00 %   
99+
0.00 %   
15
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • Thorium metal is used as an allying agent for Magnesium, It imparts greater strength and resistance to temperature.
  • compound of this metal Thorium oxide is used as an industrial catalyst.
  
Industrial Uses
NA   
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
Dentistry, Surgical Instruments Manufacturing   
Other Uses
NA   
Alloys, Jewellery, Sculptures, Statues   
Biological Properties
  
  
Toxicity
Highly Toxic   
Non Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
33
In Bone
0.00 p.p.m.   
36
0.02 p.p.m.   
29
Physical Properties
Melting Point
1,568.00 °C   
21
1,750.00 °C   
17
Boiling Point
4,027.00 °C   
12
4,790.00 °C   
8
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silver   
Luster
Metallic   
NA   
Hardness
  
  
Mohs Hardness
Not Available   
3.00   
12
Brinell Hardness
Not Available   
390.00 MPa   
29
Vickers Hardness
Not Available   
295.00 MPa   
29
Speed of Sound
Not Available   
2,490.00 m/s   
36
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   
Th   
Isotopes
  
  
Known Isotopes
27   
12
28   
11
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
1.30   
32
Allred Rochow Electronegativity
1.14   
28
1.11   
29
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
2.70   
22
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
587.00 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
1,110.00 kJ/mol   
99+
3rd Energy Level
1,814.00 kJ/mol   
99+
1,978.00 kJ/mol   
99+
4th Energy Level
2,991.00 kJ/mol   
99+
2,780.00 kJ/mol   
99+
Electrochemical Equivalent
1.72 g/amp-hr   
99+
2.16 g/amp-hr   
24
Electron Work Function
Not Available   
3.41 eV   
32
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Corrosion, Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
91   
27
90   
28
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Rn] 6d2 7s2   
Crystal Structure
Tetragonal (TETR)   
Face Centered Cubic (FCC)   
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
FCC-Crystal-Structure-of-Thorium.jpg#100   
Atom
  
  
Number of Protons
91   
27
90   
28
Number of Neutrons
122   
21
142   
15
Number of Electrons
91   
27
90   
28
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
179.80 pm   
15
Covalent Radius
200.00 pm   
11
206.00 pm   
7
Van der Waals Radius
243.00 pm   
11
237.00 pm   
15
Atomic Weight
231.04 amu   
24
232.04 amu   
23
Atomic Volume
15.00 cm3/mol   
34
19.90 cm3/mol   
20
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Actinium
  
Next Element
Uranium
  
Protactinium
  
Valence Electron Potential
92.00 (-eV)   
11
59.30 (-eV)   
23
Lattice Constant
392.50 pm   
23
508.42 pm   
14
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
15.37 g/cm3   
20
11.72 g/cm3   
32
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available   
0.00 (Pa)   
22
Elasticity properties
  
  
Shear Modulus
Not Available   
31.00 GPa   
21
Bulk Modulus
Not Available   
54.00 GPa   
22
Young's Modulus
Not Available   
79.00 GPa   
24
Poisson Ratio
Not Available   
0.27   
20
Other Mechanical Properties
Unknown   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
15.37   
12
11.70   
23
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Superconductor   
Resistivity
177.00 nΩ·m   
21
157.00 nΩ·m   
22
Electrical Conductivity
0.05 106/cm Ω   
34
0.07 106/cm Ω   
31
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.12 J/(kg K)   
40
Molar Heat Capacity
Not Available   
26.23 J/mol·K   
30
Thermal Conductivity
47.00 W/m·K   
32
54.00 W/m·K   
28
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
9.90 µm/(m·K)   
40
11.00 µm/(m·K)   
36
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
429.00 kJ/mol   
15
Enthalpy of Fusion
12.34 kJ/mol   
28
15.48 kJ/mol   
19
Enthalpy of Atomization
Not Available   
468.60 kJ/mol   
15
Standard Molar Entropy
198.10 J/mol.K   
1
27.30 J/mol.K   
99+
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