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What is Protactinium?
Protactinium


Periodic Table
Symbol
Pa
Group Number
3 15
Period Number
7 1
Block
f block
Element Family
Actinide
CAS Number
7440133 66
Space Group Name
I4/mmm
Space Group Number
139.00 11
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
Sources
Found in Uranium Ores, Mining, Ores of metals
History
Who Discovered
William Crookes
Discovery
In 1900
Abundance
Abundance In Universe
0.00 % 17
Abundance In Sun
0.00 % 26
Abundance In Meteorites
-
Abundance In Earth's Crust
0.00 % 57
Abundance In Oceans
0.00 % 47
Abundance In Humans
0.00 % 24
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
Industrial Uses
-
Medical Uses
-
Other Uses
-
Biological Properties
Toxicity
Highly Toxic
Present in Human Body
No
In Blood
0.00 Blood/mg dm-3 40
In Bone
0.00 p.p.m. 41
Physical
Melting Point
1,568.00 °C 21
Boiling Point
4,027.00 °C 12
Appearance
Physical State
Solid
Color
Silver
Luster
Metallic
Hardness
Mohs Hardness
5.00 8
Brinell Hardness
125.00 MPa 58
Vickers Hardness
220.00 MPa 50
Speed of Sound
12,400.00 m/s 3
Optical Properties
Refractive Index
1.60 33
Reflectivity
60.00 % 23
Allotropes
No
α Allotropes
-
β Allotropes
-
γ Allotropes
-
Chemical
Chemical Formula
Pa
Isotopes
Known Isotopes
27 12
Electronegativity
Pauling Electronegativity
1.50 28
Sanderson Electronegativity
1.50 18
Allred Rochow Electronegativity
1.14 29
Mulliken-Jaffe Electronegativity
1.50 26
Allen Electronegativity
1.50 32
Electropositivity
Pauling Electropositivity
2.50 27
Ionization Energies
1st Energy Level
568.00 kJ/mol 68
2nd Energy Level
1,128.00 kJ/mol 73
3rd Energy Level
1,814.00 kJ/mol 85
4th Energy Level
2,991.00 kJ/mol 76
5th Energy Level
5,120.00 kJ/mol 71
6th Energy Level
5,680.00 kJ/mol 74
7th Energy level
5,680.00 kJ/mol 65
8th Energy Level
5,680.00 kJ/mol 63
9th Energy Level
5,120.00 kJ/mol 75
10th Energy Level
5,120.00 kJ/mol 72
11th Energy Level
5,680.00 kJ/mol 66
12th Energy Level
5,680.00 kJ/mol 68
13th Energy Level
5,680.00 kJ/mol 57
14th Energy Level
5,680.00 kJ/mol 45
15th Energy Level
56,800.00 kJ/mol 57
16th Energy Level
56,800.00 kJ/mol 45
17th Energy Level
568.50 kJ/mol 71
18th Energy Level
5,680.00 kJ/mol 59
19th Energy Level
568.30 kJ/mol 69
20th Energy Level
568.00 kJ/mol 63
21st Energy Level
568.00 kJ/mol 73
22nd Energy Level
568.00 kJ/mol 58
23rd Energy Level
568.00 kJ/mol 73
24th Energy Level
568.00 kJ/mol 60
25th Energy Level
568.00 kJ/mol 60
26th Energy Level
568.00 kJ/mol 67
27th Energy Level
568.00 kJ/mol 63
28th Energy Level
568.00 kJ/mol 67
29th Energy Level
568.00 kJ/mol 69
30th Energy Level
568.00 kJ/mol 64
Electrochemical Equivalent
1.72 g/amp-hr 47
Electron Work Function
5.89 eV 3
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Atomic
Atomic Number
91 27
Electron Configuration
[Rn] 5f2 6d1 7s2
Crystal Structure
Tetragonal (TETR)
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100
Atom
Number of Protons
91 27
Number of Neutrons
122 22
Number of Electrons
91 27
Radius of an Atom
Atomic Radius
163.00 pm 27
Covalent Radius
200.00 pm 11
Van der Waals Radius
243.00 pm 15
Atomic Weight
231.04 amu 24
Atomic Volume
15.00 cm3/mol 50
Adjacent Atomic Numbers
Previous Element
16
Next Element
15
Valence Electron Potential
92.00 (-eV) 11
Lattice Constant
392.50 pm 26
Lattice Angles
π/2, π/2, π/2
Lattice C/A Ratio
1.58 36
Mechanical
Density
Density At Room Temperature
15.37 g/cm3 20
Density When Liquid (at m.p.)
15.37 g/cm3 21
Tensile Strength
80.00 MPa 29
Viscosity
0.00 25
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa) 37
Vapor Pressure at 2000 K
0.00 (Pa) 32
Elasticity properties
Shear Modulus
16.00 GPa 49
Bulk Modulus
47.00 GPa 26
Young's Modulus
47.00 GPa 41
Poisson Ratio
0.23 30
Other Mechanical Properties
-
Magnetic
Magnetic Characteristics
Specific Gravity
15.37 23
Magnetic Ordering
Paramagnetic
Permeability
0.00 H/m 10
Susceptibility
0.00 21
Electrical Properties
Electrical Property
Conductor
Resistivity
177.00 nΩ·m 21
Electrical Conductivity
0.05 106/cm Ω 39
Electron Affinity
53.03 kJ/mol 22
Thermal
Specific Heat
0.12 J/(kg K) 42
Molar Heat Capacity
27.20 J/mol·K 24
Thermal Conductivity
47.00 W/m·K 32
Critical Temperature
1,841.00 K 25
Thermal Expansion
9.90 µm/(m·K) 53
Enthalpy
Enthalpy of Vaporization
481.00 kJ/mol 17
Enthalpy of Fusion
12.34 kJ/mol 34
Enthalpy of Atomization
481.90 kJ/mol 19
Standard Molar Entropy
198.10 J/mol.K 1
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