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Protactinium vs Uranium

Protactinium
Uranium
Uranium vs Protactinium


Periodic Table
Symbol
Pa   
U   
Group Number
Not Available   
0   
18
Period Number
7   
7   
Block
f block   
f block   
Element Family
Actinide   
Actinide   
CAS Number
7440133   
99+
7440611   
28
Space Group Name
I4/mmm   
Cmcm   
Space Group Number
139.00   
8
63.00   
10
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • Major mining countries of Uranium include Russia, Australia, Namibia, Canada and Niger and total 33% Uranium are mine in Kazakhstan.
  
Sources
Found in Uranium Ores, Mining, Ores of metals   
Earth's crust, Mining, Ores of Minerals   
History
  
  
Who Discovered
William Crookes   
Not Available   
Discovery
In 1900   
In 1789   
Abundance
  
  
Abundance In Universe
Not Available   
2 * 10-8 %   
29
Abundance In Sun
~-9999 %   
~0.0000001 %   
26
Abundance In Meteorites
Not Available   
0.00 %   
99+
Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
36
Abundance In Oceans
0.00 %   
99+
0.00 %   
11
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • The main use of this metal include nuclear fuel which is used to generate electricity yin nuclear power stations.
  • Synthetic elements like transuranium are made from Uranium metal.
  
Industrial Uses
NA   
Ammunition Industry, Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys, Jewellery, Nuclear Reactor's Fuel, Sculptures, Statues   
Biological Properties
  
  
Toxicity
Highly Toxic   
Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
In Bone
0.00 p.p.m.   
36
Not Available   
Physical Properties
Melting Point
1,568.00 °C   
21
1,132.00 °C   
39
Boiling Point
4,027.00 °C   
12
3,818.00 °C   
16
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery Gray   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
6.00   
6
Brinell Hardness
Not Available   
2,350.00 MPa   
2
Vickers Hardness
Not Available   
1,960.00 MPa   
2
Speed of Sound
Not Available   
3,155.00 m/s   
25
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   
U   
Isotopes
  
  
Known Isotopes
27   
12
25   
14
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
1.38   
28
Allred Rochow Electronegativity
1.14   
28
1.22   
26
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
2.62   
26
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
597.60 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
1,420.00 kJ/mol   
99+
3rd Energy Level
1,814.00 kJ/mol   
99+
1,900.00 kJ/mol   
99+
4th Energy Level
2,991.00 kJ/mol   
99+
3,145.00 kJ/mol   
99+
Electrochemical Equivalent
1.72 g/amp-hr   
99+
1.48 g/amp-hr   
99+
Electron Work Function
Not Available   
3.63 eV   
30
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
91   
27
92   
26
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Rn] 5f3 6d1 7s2   
Crystal Structure
Tetragonal (TETR)   
Orthorhombic (ORTH)   
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
ORTH-Crystal-Structure-of-Uranium.jpg#100   
Atom
  
  
Number of Protons
91   
27
92   
26
Number of Neutrons
122   
21
146   
13
Number of Electrons
91   
27
92   
26
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
156.00 pm   
29
Covalent Radius
200.00 pm   
11
196.00 pm   
14
Van der Waals Radius
243.00 pm   
11
186.00 pm   
33
Atomic Weight
231.04 amu   
24
238.03 amu   
21
Atomic Volume
15.00 cm3/mol   
34
12.59 cm3/mol   
40
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Protactinium
  
Next Element
Uranium
  
Neptunium
  
Valence Electron Potential
92.00 (-eV)   
11
170.00 (-eV)   
4
Lattice Constant
392.50 pm   
23
295.08 pm   
99+
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
19.10 g/cm3   
17
Density When Liquid (at m.p.)
Not Available   
17.30 g/cm3   
7
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available   
0.01 (Pa)   
20
Elasticity properties
  
  
Shear Modulus
Not Available   
111.00 GPa   
10
Bulk Modulus
Not Available   
100.00 GPa   
16
Young's Modulus
Not Available   
208.00 GPa   
10
Poisson Ratio
Not Available   
0.23   
30
Other Mechanical Properties
Unknown   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
15.37   
12
18.80   
10
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Poor Conductor   
Resistivity
177.00 nΩ·m   
21
0.28 nΩ·m   
99+
Electrical Conductivity
0.05 106/cm Ω   
34
0.04 106/cm Ω   
37
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.12 J/(kg K)   
40
Molar Heat Capacity
Not Available   
27.67 J/mol·K   
15
Thermal Conductivity
47.00 W/m·K   
32
27.50 W/m·K   
40
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
9.90 µm/(m·K)   
40
13.90 µm/(m·K)   
27
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
477.00 kJ/mol   
13
Enthalpy of Fusion
12.34 kJ/mol   
28
15.48 kJ/mol   
19
Enthalpy of Atomization
Not Available   
489.50 kJ/mol   
14
Standard Molar Entropy
198.10 J/mol.K   
1
50.20 J/mol.K   
31
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