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Properties of Neptunium and Protactinium

Neptunium
Protactinium
Properties of Protactinium & Neptunium


Physical Properties
Melting Point
640.00 °C   
99+
1,568.00 °C   
21
Boiling Point
3,902.00 °C   
13
4,027.00 °C   
12
Hardness
  
  
Mohs Hardness
Not Available   
Not Available   
Brinell Hardness
Not Available   
Not Available   
Vickers Hardness
Not Available   
Not Available   
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
Not Available   
Not Available   
Speed of Sound
Not Available   
Not Available   
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
Np   
Pa   
Isotopes
  
  
Known Isotopes
20   
19
27   
12
Electronegativity
  
  
Pauling Electronegativity
1.36   
29
1.50   
27
Sanderson Electronegativity
Not Available   
Not Available   
Allred Rochow Electronegativity
1.22   
26
1.14   
28
Mulliken-Jaffe Electronegativity
Not Available   
Not Available   
Allen Electronegativity
Not Available   
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.64   
25
2.50   
27
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol   
99+
568.00 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
1,128.00 kJ/mol   
99+
3rd Energy Level
1,997.00 kJ/mol   
99+
1,814.00 kJ/mol   
99+
Electrochemical Equivalent
1.77 g/amp-hr   
39
1.72 g/amp-hr   
99+
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces. This metal also have radioactive isotopes.Radioactive Isotopes, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces.Radioactivity, 
?
Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.Solubility   
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces. This metal also have radioactive isotopes.Radioactive Isotopes, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces.Radioactivity   
Mechanical Properties
Density
  
  
Density At Room Temperature
19.38 g/cm3   
14
15.37 g/cm3   
20
Density When Liquid (at m.p.)
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
Not Available   
Vapor Pressure at 2000 K
0.11 (Pa)   
17
Not Available   
Tensile Strength
125.00 MPa   
14
Not Available   
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
Not Available   
Not Available   
Bulk Modulus
Not Available   
Not Available   
Young's Modulus
Not Available   
Not Available   
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
?
Ductility of metals defines their ability to deform under tensile stress; this is often characterized by the metals ability to be stretched into a wire.Ductile   
Unknown   
Periodic Table
Symbol
Np   
Pa   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
Block
?
The f-block is in the center-left of a 32-column periodic table but in the footnoted appendage of 18-column tables. These elements are not generally considered as part of any group. They are often called inner transition metals.f block   
?
The f-block is in the center-left of a 32-column periodic table but in the footnoted appendage of 18-column tables. These elements are not generally considered as part of any group. They are often called inner transition metals.f block   
Element Family
?
Total 15 metals are included in actinide series, from Actinium to Lawrencium. Actinide series is located under f and d block of the periodic table.Actinide   
?
Total 15 metals are included in actinide series, from Actinium to Lawrencium. Actinide series is located under f and d block of the periodic table.Actinide   
Atomic Properties
Atomic Number
93   
25
91   
27
Atomic Weight
237.00 amu   
22
231.04 amu   
24
Atomic Volume
11.62 cm3/mol   
99+
15.00 cm3/mol   
34
Electron Configuration
[Rn] 5f4 6d1 7s2   
[Rn] 5f2 6d1 7s2   
Valence Electron Potential
96.00 (-eV)   
9
92.00 (-eV)   
11
Atom
  
  
Number of Protons
93   
25
91   
27
Number of Neutrons
144   
14
122   
21
Number of Electrons
93   
25
91   
27
Crystal Structure
?
Orthorhombic lattices occur due to stretching a cubic lattice along two of its orthogonal sides. It gets result in a rectangular prism with a rectangular at base. These 3 bases intersect each other at 90°.Orthorhombic (ORTH)   
?
The tetragonal crystal structure occur as a result of stretching a cubic lattice along one of its lattice vectors due to which cube becomes a rectangular prism with a square shape at base.Tetragonal (TETR)   
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
TETR-Crystal-Structure-of-Protactinium.jpg#100   
Radius of an Atom
  
  
Atomic Radius
155.00 pm   
30
163.00 pm   
25
Covalent Radius
190.00 pm   
18
200.00 pm   
11
Van der Waals Radius
221.00 pm   
22
243.00 pm   
11
Lattice Constant
666.30 pm   
3
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   
Adjacent Atomic Numbers
  
  
Next Element
Plutonium
  
Uranium
  
Previous Element
Uranium
  
Thorium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
1.22 nΩ·m   
99+
177.00 nΩ·m   
21
Electrical Conductivity
0.01 106/cm Ω   
99+
0.05 106/cm Ω   
34
Electron Affinity
Not Available   
Not Available   
Electrical Property
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
Magnetic Characteristics
  
  
Specific Gravity
20.25   
6
15.37   
12
Magnetic Ordering
?
Paramagnetic metals are slightly attracted by magnet, but they can’t retain the magnetic effect once they are removed from the magnetic field.Paramagnetic   
?
Paramagnetic metals are slightly attracted by magnet, but they can’t retain the magnetic effect once they are removed from the magnetic field.Paramagnetic   
Permeability
Not Available   
Not Available   
Susceptibility
Not Available   
Not Available   
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.12 J/(kg K)   
40
Thermal Conductivity
6.30 W/m·K   
99+
47.00 W/m·K   
32
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
29.46 J/mol·K   
8
Not Available   
Thermal Expansion
Not Available   
9.90 µm/(m·K)   
40
Standard Molar Entropy
Not Available   
198.10 J/mol.K   
1
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
Not Available   
Enthalpy of Fusion
3.20 kJ/mol   
99+
12.34 kJ/mol   
28
Enthalpy of Atomization
Not Available   
Not Available   
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