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Properties of Iridium and Cerium

Iridium
Cerium
Properties of Cerium & Iridium


Physical Properties
Melting Point
2,410.00 °C   
7
795.00 °C   
99+
Boiling Point
4,527.00 °C   
10
3,257.00 °C   
23
Hardness
  
  
Mohs Hardness
6.50   
5
2.50   
14
Brinell Hardness
1,670.00 MPa   
5
186.00 MPa   
99+
Vickers Hardness
1,760.00 MPa   
3
210.00 MPa   
32
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
78.00 %   
6
Not Available   
Speed of Sound
4,825.00 m/s   
13
2,100.00 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
Ir   
Ce   
Isotopes
  
  
Known Isotopes
34   
5
30   
9
Electronegativity
  
  
Pauling Electronegativity
2.20   
4
1.12   
99+
Sanderson Electronegativity
Not Available   
Not Available   
Allred Rochow Electronegativity
1.55   
11
1.08   
31
Mulliken-Jaffe Electronegativity
Not Available   
Not Available   
Allen Electronegativity
1.68   
17
Not Available   
Electropositivity
  
  
Pauling Electropositivity
1.80   
99+
2.88   
11
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol   
9
534.40 kJ/mol   
99+
2nd Energy Level
1,600.00 kJ/mol   
35
1,050.00 kJ/mol   
99+
3rd Energy Level
Not Available   
1,949.00 kJ/mol   
99+
Electrochemical Equivalent
1.14 g/amp-hr   
99+
1.74 g/amp-hr   
99+
Electron Work Function
4.55 eV   
13
2.84 eV   
39
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   
?
Stable metals are non radioactive metals and have zero valence electrons in the outer shell.Chemical Stability, 
?
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, 
?
Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.Solubility   
Mechanical Properties
Density
  
  
Density At Room Temperature
22.56 g/cm3   
10
6.77 g/cm3   
99+
Density When Liquid (at m.p.)
19.00 g/cm3   
3
6.55 g/cm3   
38
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
34
Vapor Pressure at 2000 K
0.00 (Pa)   
25
1.04 (Pa)   
13
Tensile Strength
2,000.00 MPa   
2
Not Available   
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
210.00 GPa   
2
13.50 GPa   
99+
Bulk Modulus
320.00 GPa   
3
21.50 GPa   
99+
Young's Modulus
528.00 GPa   
1
33.60 GPa   
99+
Poisson Ratio
0.26   
22
0.24   
27
Other Mechanical Properties
NA   
?
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
Ir   
Ce   
Group Number
9   
9
Not Available   
Period Number
6   
6   
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 Lanthanide series from Lanthanum to Lutetium. Lanthanide series is located under f and d block of the periodic table.Lanthanide   
Atomic Properties
Atomic Number
77   
39
58   
99+
Atomic Weight
192.22 amu   
34
140.12 amu   
99+
Atomic Volume
9.53 cm3/mol   
99+
20.67 cm3/mol   
17
Electron Configuration
[Xe] 4f14 5d7 6s2   
[Xe] 4f1 5d1 6s2   
Valence Electron Potential
140.00 (-eV)   
5
41.78 (-eV)   
99+
Atom
  
  
Number of Protons
74   
99+
58   
99+
Number of Neutrons
110   
27
82   
99+
Number of Electrons
74   
99+
58   
99+
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)   
?
In crystallography, the hexagonal crystal structure and its double hexagonal crystal structure is one of the 7 crystal structure, The hexagonal lattice system consists of just one Bravais lattice type: the hexagonal shape.Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100   
DHCP-Crystal-Structure-of-Cerium.jpg#100   
Radius of an Atom
  
  
Atomic Radius
136.00 pm   
99+
181.80 pm   
12
Covalent Radius
141.00 pm   
99+
204.00 pm   
8
Van der Waals Radius
202.00 pm   
27
235.00 pm   
17
Lattice Constant
383.90 pm   
26
362.00 pm   
34
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
Not Available   
Adjacent Atomic Numbers
  
  
Next Element
Platinum
  
Praseodymium
  
Previous Element
Osmium
  
Lanthanum
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
47.10 nΩ·m   
99+
828.00 nΩ·m   
3
Electrical Conductivity
0.19 106/cm Ω   
10
0.01 106/cm Ω   
99+
Electron Affinity
151.00 kJ/mol   
4
50.00 kJ/mol   
21
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
6.77   
99+
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
0.19 J/(kg K)   
32
Thermal Conductivity
147.00 W/m·K   
10
11.30 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
25.10 J/mol·K   
99+
26.94 J/mol·K   
23
Thermal Expansion
6.40 µm/(m·K)   
99+
6.30 µm/(m·K)   
99+
Standard Molar Entropy
35.50 J/mol.K   
99+
72.00 J/mol.K   
12
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol   
1
414.00 kJ/mol   
16
Enthalpy of Fusion
35.23 kJ/mol   
1
5.46 kJ/mol   
99+
Enthalpy of Atomization
837.00 kJ/mol   
1
381.00 kJ/mol   
23
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