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Properties of Iridium and Protactinium

Iridium
Protactinium
Properties of Protactinium & Iridium


Physical Properties
Melting Point
2,410.00 °C   
7
1,568.00 °C   
21
Boiling Point
4,527.00 °C   
10
4,027.00 °C   
12
Hardness
  
  
Mohs Hardness
6.50   
5
Not Available   
Brinell Hardness
1,670.00 MPa   
5
Not Available   
Vickers Hardness
1,760.00 MPa   
3
Not Available   
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
78.00 %   
6
Not Available   
Speed of Sound
4,825.00 m/s   
13
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
Ir   
Pa   
Isotopes
  
  
Known Isotopes
34   
5
27   
12
Electronegativity
  
  
Pauling Electronegativity
2.20   
4
1.50   
27
Sanderson Electronegativity
Not Available   
Not Available   
Allred Rochow Electronegativity
1.55   
11
1.14   
28
Mulliken-Jaffe Electronegativity
Not Available   
Not Available   
Allen Electronegativity
1.68   
17
Not Available   
Electropositivity
  
  
Pauling Electropositivity
1.80   
99+
2.50   
27
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol   
9
568.00 kJ/mol   
99+
2nd Energy Level
1,600.00 kJ/mol   
35
1,128.00 kJ/mol   
99+
3rd Energy Level
Not Available   
1,814.00 kJ/mol   
99+
Electrochemical Equivalent
1.14 g/amp-hr   
99+
1.72 g/amp-hr   
99+
Electron Work Function
4.55 eV   
13
Not Available   
Other Chemical Properties
?
Flammable metals have ability to burn or ignite, causing fire or combustion.Flammable, 
?
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
22.56 g/cm3   
10
15.37 g/cm3   
20
Density When Liquid (at m.p.)
19.00 g/cm3   
3
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
Not Available   
Vapor Pressure at 2000 K
0.00 (Pa)   
25
Not Available   
Tensile Strength
2,000.00 MPa   
2
Not Available   
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
210.00 GPa   
2
Not Available   
Bulk Modulus
320.00 GPa   
3
Not Available   
Young's Modulus
528.00 GPa   
1
Not Available   
Poisson Ratio
0.26   
22
Not Available   
Other Mechanical Properties
NA   
Unknown   
Periodic Table
Symbol
Ir   
Pa   
Group Number
9   
9
Not Available   
Period Number
6   
7   
Block
?
The d-block is on the middle of the periodic table and includes elements from columns 3 through 12. These elements are also known as the transition metals because they show a transitivity in their properties i.e. they show a trend in their properties.d 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
?
What is Transition Metal? All transition metals are placed under the d-block from group number 3 to 12. Transition metals show characteristics like malleability, ductility and are good conductor of electricity.Transition Metal   
?
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
77   
39
91   
27
Atomic Weight
192.22 amu   
34
231.04 amu   
24
Atomic Volume
9.53 cm3/mol   
99+
15.00 cm3/mol   
34
Electron Configuration
[Xe] 4f14 5d7 6s2   
[Rn] 5f2 6d1 7s2   
Valence Electron Potential
140.00 (-eV)   
5
92.00 (-eV)   
11
Atom
  
  
Number of Protons
74   
99+
91   
27
Number of Neutrons
110   
27
122   
21
Number of Electrons
74   
99+
91   
27
Crystal Structure
?
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)   
?
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
FCC-Crystal-Structure-of-Iridium.jpg#100   
TETR-Crystal-Structure-of-Protactinium.jpg#100   
Radius of an Atom
  
  
Atomic Radius
136.00 pm   
99+
163.00 pm   
25
Covalent Radius
141.00 pm   
99+
200.00 pm   
11
Van der Waals Radius
202.00 pm   
27
243.00 pm   
11
Lattice Constant
383.90 pm   
26
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
Platinum
  
Uranium
  
Previous Element
Osmium
  
Thorium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
47.10 nΩ·m   
99+
177.00 nΩ·m   
21
Electrical Conductivity
0.19 106/cm Ω   
10
0.05 106/cm Ω   
34
Electron Affinity
151.00 kJ/mol   
4
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
21.78   
3
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
0.13 J/(kg K)   
39
0.12 J/(kg K)   
40
Thermal Conductivity
147.00 W/m·K   
10
47.00 W/m·K   
32
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
25.10 J/mol·K   
99+
Not Available   
Thermal Expansion
6.40 µm/(m·K)   
99+
9.90 µm/(m·K)   
40
Standard Molar Entropy
35.50 J/mol.K   
99+
198.10 J/mol.K   
1
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol   
1
Not Available   
Enthalpy of Fusion
35.23 kJ/mol   
1
12.34 kJ/mol   
28
Enthalpy of Atomization
837.00 kJ/mol   
1
Not Available   
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