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Properties of Protactinium and Nobelium


Properties of Nobelium & Protactinium


Physical Properties

Melting Point
1,568.00 °C   
21
827.00 °C   
99+

Boiling Point
4,027.00 °C   
12
Not Available   

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
Pa   
No   

Isotopes
  
  

Known Isotopes
27   
12
13   
26

Electronegativity
  
  

Pauling Electronegativity
1.50   
27
1.30   
32

Sanderson Electronegativity
Not Available   
Not Available   

Allred Rochow Electronegativity
1.14   
28
1.20   
27

Mulliken-Jaffe Electronegativity
Not Available   
Not Available   

Allen Electronegativity
Not Available   
Not Available   

Electropositivity
  
  

Pauling Electropositivity
2.50   
27
2.70   
22

Ionization Energies
  
  

1st Energy Level
568.00 kJ/mol   
99+
642.00 kJ/mol   
99+

2nd Energy Level
1,128.00 kJ/mol   
99+
1,254.00 kJ/mol   
99+

3rd Energy Level
1,814.00 kJ/mol   
99+
2,643.00 kJ/mol   
99+

Electrochemical Equivalent
1.72 g/amp-hr   
99+
4.83 g/amp-hr   
4

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
  
?
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
15.37 g/cm3   
20
Not Available   

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
Not Available   
Not Available   

Tensile Strength
Not Available   
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
Unknown   
Unknown   

Periodic Table

Symbol
Pa   
No   

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
91   
27
102   
16

Atomic Weight
231.04 amu   
24
259.00 amu   
13

Atomic Volume
15.00 cm3/mol   
34
Not Available   

Electron Configuration
[Rn] 5f2 6d1 7s2   
[Rn] 5f14 7s2   

Valence Electron Potential
92.00 (-eV)   
11
26.00 (-eV)   
99+

Atom
  
  

Number of Protons
91   
27
102   
16

Number of Neutrons
122   
21
157   
7

Number of Electrons
91   
27
102   
16

Crystal Structure
?
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)
  
?
The crustal structure for this metal is Unknown or not yet discoveredNot Known
  

Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
Unknown-Crystal-Structure-of-Nobelium.jpg#100   

Radius of an Atom
  
  

Atomic Radius
163.00 pm   
25
Not Available   

Covalent Radius
200.00 pm   
11
Not Available   

Van der Waals Radius
243.00 pm   
11
246.00 pm   
8

Lattice Constant
392.50 pm   
23
Not Available   

Lattice Angles
π/2, π/2, π/2   
NA   

Lattice C/A Ratio
Not Available   
Not Available   

Adjacent Atomic Numbers
  
  

Next Element
Uranium
  
Lawrencium
  

Previous Element
Thorium
  

Magnetic Properties

Electrical Properties
  
  

Resistivity
177.00 nΩ·m   
21
Not Available   

Electrical Conductivity
0.05 106/cm Ω   
34
Not Available   

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
  
Unknown   

Magnetic Characteristics
  
  

Specific Gravity
15.37   
12
Not Available   

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
  
Unknown   

Permeability
Not Available   
Not Available   

Susceptibility
Not Available   
Not Available   

Thermal Properties

Specific Heat
0.12 J/(kg K)   
40
Not Available   

Thermal Conductivity
47.00 W/m·K   
32
Not Available   

Critical Temperature
Not Available   
Not Available   

Molar Heat Capacity
Not Available   
Not Available   

Thermal Expansion
9.90 µm/(m·K)   
40
Not Available   

Standard Molar Entropy
198.10 J/mol.K   
1
Not Available   

Enthalpy
  
  

Enthalpy of Vaporization
Not Available   
Not Available   

Enthalpy of Fusion
12.34 kJ/mol   
28
Not Available   

Enthalpy of Atomization
Not Available   
Not Available   

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