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Pa Element
Protactinium


Periodic Table
0
Symbol
Pa 0
Group Number
Not Available 0
Period Number
7 1
Block
f block 0
Element Family
Actinide 0
CAS Number
7440133 66
Space Group Name
I4/mmm 0
Space Group Number
139.00 8
Facts
0
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
0
Sources
Found in Uranium Ores, Mining, Ores of metals 0
History
0
Who Discovered
William Crookes 0
Discovery
In 1900 0
Abundance
0
Abundance In Universe
Not Available 0
Abundance In Sun
~-9999 % 0
Abundance In Meteorites
Not Available 0
Abundance In Earth's Crust
0.00 % 57
Abundance In Oceans
0.00 % 47
Abundance In Humans
Not Available 0
Uses
0
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
0
Industrial Uses
NA 0
Medical Uses
NA 0
Other Uses
NA 0
Biological Properties
0
Toxicity
Highly Toxic 0
Present in Human Body
No 0
In Blood
0.00 Blood/mg dm-3 37
In Bone
0.00 p.p.m. 36
Physical
0
Melting Point
1,568.00 °C 21
Boiling Point
4,027.00 °C 12
Appearance
0
Physical State
Solid 0
Color
Silver 0
Luster
Metallic 0
Hardness
0
Mohs Hardness
Not Available 0
Brinell Hardness
Not Available 0
Vickers Hardness
Not Available 0
Speed of Sound
Not Available 0
Optical Properties
0
Refractive Index
Not Available 0
Reflectivity
Not Available 0
Allotropes
No 0
α Allotropes
Not Available 0
β Allotropes
Not Available 0
γ Allotropes
Not Available 0
Chemical
0
Chemical Formula
Pa 0
Isotopes
0
Known Isotopes
27 12
Electronegativity
0
Pauling Electronegativity
1.50 27
Sanderson Electronegativity
Not Available 0
Allred Rochow Electronegativity
1.14 28
Mulliken-Jaffe Electronegativity
Not Available 0
Allen Electronegativity
Not Available 0
Electropositivity
0
Pauling Electropositivity
2.50 27
Ionization Energies
0
1st Energy Level
568.00 kJ/mol 68
2nd Energy Level
1,128.00 kJ/mol 72
3rd Energy Level
1,814.00 kJ/mol 81
4th Energy Level
2,991.00 kJ/mol 66
5th Energy Level
Not Available 0
6th Energy Level
Not Available 0
7th Energy level
Not Available 0
8th Energy Level
Not Available 0
9th Energy Level
Not Available 0
10th Energy Level
Not Available 0
11th Energy Level
Not Available 0
12th Energy Level
Not Available 0
13th Energy Level
Not Available 0
14th Energy Level
Not Available 0
15th Energy Level
Not Available 0
16th Energy Level
Not Available 0
17th Energy Level
Not Available 0
18th Energy Level
Not Available 0
19th Energy Level
Not Available 0
20th Energy Level
Not Available 0
21st Energy Level
Not Available 0
22nd Energy Level
Not Available 0
23rd Energy Level
Not Available 0
24th Energy Level
Not Available 0
25th Energy Level
Not Available 0
26th Energy Level
Not Available 0
27th Energy Level
Not Available 0
28th Energy Level
Not Available 0
29th Energy Level
Not Available 0
30th Energy Level
Not Available 0
Electrochemical Equivalent
1.72 g/amp-hr 43
Electron Work Function
Not Available 0
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity 0
Atomic
0
Atomic Number
91 27
Electron Configuration
[Rn] 5f2 6d1 7s2 0
Crystal Structure
Tetragonal (TETR) 0
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100 0
Atom
0
Number of Protons
91 27
Number of Neutrons
122 21
Number of Electrons
91 27
Radius of an Atom
0
Atomic Radius
163.00 pm 25
Covalent Radius
200.00 pm 11
Van der Waals Radius
243.00 pm 11
Atomic Weight
231.04 amu 24
Atomic Volume
15.00 cm3/mol 34
Adjacent Atomic Numbers
0
Previous Element
16 0
Next Element
15 0
Valence Electron Potential
92.00 (-eV) 11
Lattice Constant
392.50 pm 23
Lattice Angles
π/2, π/2, π/2 0
Lattice C/A Ratio
Not Available 0
Mechanical
0
Density
0
Density At Room Temperature
15.37 g/cm3 20
Density When Liquid (at m.p.)
Not Available 0
Tensile Strength
Not Available 0
Viscosity
Not Available 0
Vapor Pressure
0
Vapor Pressure at 1000 K
Not Available 0
Vapor Pressure at 2000 K
Not Available 0
Elasticity properties
0
Shear Modulus
Not Available 0
Bulk Modulus
Not Available 0
Young's Modulus
Not Available 0
Poisson Ratio
Not Available 0
Other Mechanical Properties
Unknown 0
Magnetic
0
Magnetic Characteristics
0
Specific Gravity
15.37 12
Magnetic Ordering
Paramagnetic 0
Permeability
Not Available 0
Susceptibility
Not Available 0
Electrical Properties
0
Electrical Property
Conductor 0
Resistivity
177.00 nΩ·m 21
Electrical Conductivity
0.05 106/cm Ω 34
Electron Affinity
Not Available 0
Thermal
0
Specific Heat
0.12 J/(kg K) 40
Molar Heat Capacity
Not Available 0
Thermal Conductivity
47.00 W/m·K 32
Critical Temperature
Not Available 0
Thermal Expansion
9.90 µm/(m·K) 40
Enthalpy
0
Enthalpy of Vaporization
Not Available 0
Enthalpy of Fusion
12.34 kJ/mol 28
Enthalpy of Atomization
Not Available 0
Standard Molar Entropy
198.10 J/mol.K 1
Summary >>
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