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