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Properties of Protactinium and Lead

Protactinium
Lead
Properties of Lead & Protactinium


Physical Properties
Melting Point
1,568.00 °C   
21
327.50 °C   
99+
Boiling Point
4,027.00 °C   
12
1,740.00 °C   
99+
Hardness
  
  
Mohs Hardness
Not Available   
1.50   
18
Brinell Hardness
Not Available   
38.00 MPa   
99+
Vickers Hardness
Not Available   
Not Available   
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
Not Available   
Not Available   
Speed of Sound
Not Available   
1,190.00 m/s   
99+
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   
Pb   
Isotopes
  
  
Known Isotopes
27   
12
35   
4
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
1.87   
13
Sanderson Electronegativity
Not Available   
2.29   
4
Allred Rochow Electronegativity
1.14   
28
1.55   
11
Mulliken-Jaffe Electronegativity
Not Available   
2.41   
2
Allen Electronegativity
Not Available   
1.85   
8
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
1.67   
99+
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
715.60 kJ/mol   
31
2nd Energy Level
1,128.00 kJ/mol   
99+
1,450.50 kJ/mol   
99+
3rd Energy Level
1,814.00 kJ/mol   
99+
3,081.50 kJ/mol   
23
Electrochemical Equivalent
1.72 g/amp-hr   
99+
3.87 g/amp-hr   
9
Electron Work Function
Not Available   
4.25 eV   
21
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   
?
Anti-corrosion metals have the protection on their surfaces which protect them from corroding in corrosive environments.Anti Corrosion, 
?
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   
Mechanical Properties
Density
  
  
Density At Room Temperature
15.37 g/cm3   
20
11.34 g/cm3   
33
Density When Liquid (at m.p.)
Not Available   
10.66 g/cm3   
15
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
1.64 (Pa)   
7
Vapor Pressure at 2000 K
Not Available   
Not Available   
Tensile Strength
Not Available   
12.00 MPa   
20
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
Not Available   
5.60 GPa   
99+
Bulk Modulus
Not Available   
46.00 GPa   
24
Young's Modulus
Not Available   
16.00 GPa   
99+
Poisson Ratio
Not Available   
0.44   
3
Other Mechanical Properties
Unknown   
?
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, 
?
Malleability of metals defines their ability to deform under compressive stress; this is often characterized by the metals ability to form a thin sheet by hammering or rolling.Malleable   
Periodic Table
Symbol
Pa   
Pb   
Group Number
Not Available   
14   
4
Period Number
7   
6   
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 p-block is on the right side of the periodic table and includes elements from the six columns beginning with column 13 and ending with column 18. Helium, though being in the top of group 18, is not included in the p-block.p 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   
?
All post transition metals are placed in group number 13, 14 and 15 of periodic table. In fact, they are located between Transition Metals and Metalloids. Post transition metals have very poor mechanical properties.Post-​Transition   
Atomic Properties
Atomic Number
91   
27
82   
34
Atomic Weight
231.04 amu   
24
207.20 amu   
30
Atomic Volume
15.00 cm3/mol   
34
18.17 cm3/mol   
27
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Xe] 4f14 5d10 6s2 6p2   
Valence Electron Potential
92.00 (-eV)   
11
24.20 (-eV)   
99+
Atom
  
  
Number of Protons
91   
27
82   
34
Number of Neutrons
122   
21
125   
19
Number of Electrons
91   
27
82   
34
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)   
?
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most common and simplest shapes found in crystals and minerals.Face Centered Cubic (FCC)   
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
FCC-Crystal-Structure-of-Lead.jpg#100   
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
175.00 pm   
19
Covalent Radius
200.00 pm   
11
146.00 pm   
38
Van der Waals Radius
243.00 pm   
11
202.00 pm   
27
Lattice Constant
392.50 pm   
23
495.08 pm   
16
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
Uranium
  
Bismuth
  
Previous Element
Thorium
  
Thallium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
177.00 nΩ·m   
21
208.00 nΩ·m   
16
Electrical Conductivity
0.05 106/cm Ω   
34
0.05 106/cm Ω   
36
Electron Affinity
Not Available   
35.10 kJ/mol   
28
Electrical Property
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
?
Poor conductor metals have moderate resistance to electric currents. They can conduct electric current through them with very low efficiency.Poor Conductor   
Magnetic Characteristics
  
  
Specific Gravity
15.37   
12
11.35   
25
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   
?
Diamagnetic metals produce a magnetic field opposite to the applied magnetic field. Thus, they are repelled by magnets and show magnetic nature.Diamagnetic   
Permeability
Not Available   
Not Available   
Susceptibility
Not Available   
Not Available   
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.13 J/(kg K)   
39
Thermal Conductivity
47.00 W/m·K   
32
35.30 W/m·K   
38
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
Not Available   
26.65 J/mol·K   
26
Thermal Expansion
9.90 µm/(m·K)   
40
28.90 µm/(m·K)   
13
Standard Molar Entropy
198.10 J/mol.K   
1
64.80 J/mol.K   
17
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
179.40 kJ/mol   
99+
Enthalpy of Fusion
12.34 kJ/mol   
28
4.77 kJ/mol   
99+
Enthalpy of Atomization
Not Available   
194.60 kJ/mol   
99+
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