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Iridium Lanthanum Comparison


Lanthanum Iridium comparison


Periodic Table

Symbol
Ir   
La   

Group Number
9   
9
Not Available   

Period Number
6   
6   

Block
d block   
f block   

Element Family
Transition Metal   
Lanthanide   

CAS Number
7439885   
99+
7439910   
99+

Space Group Name
Fm_ 3m   
P63/mmc   

Space Group Number
225.00   
2
194.00   
5

Facts

Interesting Facts
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
  

Sources
Found in Minerals, Mining, Ores of Minerals   
Found in Minerals, Mining, Ores of Minerals   

History
  
  

Who Discovered
Smithson Tennant   
Carl Gustaf Mosander   

Discovery
In 1803   
In 1838   

Abundance
  
  

Abundance In Universe
2 * 10-7 %   
22
2 * 10-7 %   
22

Abundance In Sun
~0.0000002 %   
25
~0.0000002 %   
25

Abundance In Meteorites
0.00 %   
29
0.00 %   
32

Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
19

Abundance In Oceans
Not Available   
0.00 %   
29

Uses

Uses & Benefits
  • Iridium has an anti corrosion properties and it is used in special alloy with Osmium metal and that alloy is used in pen tips and compass bearings.
  
  • It has no commercial uses, but its alloys are in high demand. Lanthanum and Nickel alloy is used for the hydrogen gas storage.
  • The best-known use for mischmetal alloy of Lanthanum is; as a ‘flints’ for cigarette lighters.
  

Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry   
Electrical Industry, Electronic Industry   

Medical Uses
NA   
NA   

Other Uses
Alloys   
Alloys, Mirror Manufacturing   

Biological Properties
  
  

Toxicity
Toxic   
Low Toxic   

Present in Human Body
Yes   
Yes   

In Bone
Not Available   
0.08 p.p.m.   
24

Physical Properties

Melting Point
2,410.00 °C   
7
920.00 °C   
99+

Boiling Point
4,527.00 °C   
10
3,469.00 °C   
18

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silvery White   
Silvery White   

Luster
Metallic   
NA   

Hardness
  
  

Mohs Hardness
6.50   
5
2.50   
14

Brinell Hardness
1,670.00 MPa   
5
350.00 MPa   
30

Vickers Hardness
1,760.00 MPa   
3
360.00 MPa   
26

Speed of Sound
4,825.00 m/s   
13
2,475.00 m/s   
37

Optical Properties
  
  

Reflectivity
78.00 %   
6
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   
La   

Isotopes
  
  

Known Isotopes
34   
5
31   
8

Electronegativity
  
  

Pauling Electronegativity
2.20   
4
1.10   
99+

Allred Rochow Electronegativity
1.55   
11
1.08   
31

Allen Electronegativity
1.68   
17
Not Available   

Electropositivity
  
  

Pauling Electropositivity
1.80   
99+
2.90   
10

Ionization Energies
  
  

1st Energy Level
880.00 kJ/mol   
9
538.10 kJ/mol   
99+

2nd Energy Level
1,600.00 kJ/mol   
35
1,067.00 kJ/mol   
99+

3rd Energy Level
Not Available   
1,850.30 kJ/mol   
99+

4th Energy Level
Not Available   
4,819.00 kJ/mol   
22

5th Energy Level
Not Available   
5,940.00 kJ/mol   
25

Electrochemical Equivalent
1.14 g/amp-hr   
99+
1.73 g/amp-hr   
99+

Electron Work Function
4.55 eV   
13
3.50 eV   
31

Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Solubility   

Atomic Properties

Atomic Number
77   
39
57   
99+

Electron Configuration
[Xe] 4f14 5d7 6s2   
[Xe] 5d2 6s2   

Crystal Structure
Face Centered Cubic (FCC)   
Double Hexagonal Close Packed (DHCP)   

Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100   
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   

Atom
  
  

Number of Protons
74   
99+
57   
99+

Number of Neutrons
110   
27
82   
99+

Number of Electrons
74   
99+
57   
99+

Radius of an Atom
  
  

Atomic Radius
136.00 pm   
99+
187.00 pm   
8

Covalent Radius
141.00 pm   
99+
207.00 pm   
6

Van der Waals Radius
202.00 pm   
27
240.00 pm   
13

Atomic Weight
192.22 amu   
34
138.91 amu   
99+

Atomic Volume
9.53 cm3/mol   
99+
20.73 cm3/mol   
16

Adjacent Atomic Numbers
  
  

Previous Element
Osmium
  
Barium
  

Next Element
Platinum
  
Cerium
  

Valence Electron Potential
140.00 (-eV)   
5
40.71 (-eV)   
99+

Lattice Constant
383.90 pm   
26
377.20 pm   
28

Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   

Lattice C/A Ratio
Not Available   
1.62   
2

Mechanical Properties

Density
  
  

Density At Room Temperature
22.56 g/cm3   
10
6.16 g/cm3   
99+

Density When Liquid (at m.p.)
19.00 g/cm3   
3
5.94 g/cm3   
99+

Tensile Strength
2,000.00 MPa   
2
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Vapor Pressure at 2000 K
0.00 (Pa)   
25
0.98 (Pa)   
15

Elasticity properties
  
  

Shear Modulus
210.00 GPa   
2
14.30 GPa   
40

Bulk Modulus
320.00 GPa   
3
27.90 GPa   
99+

Young's Modulus
528.00 GPa   
1
36.60 GPa   
99+

Poisson Ratio
0.26   
22
0.28   
17

Other Mechanical Properties
NA   
Ductile   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
21.78   
3
6.17   
99+

Magnetic Ordering
Paramagnetic   
Paramagnetic   

Electrical Properties
  
  

Electrical Property
Conductor   
Conductor   

Resistivity
47.10 nΩ·m   
99+
615.00 nΩ·m   
7

Electrical Conductivity
0.19 106/cm Ω   
10
0.01 106/cm Ω   
99+

Electron Affinity
151.00 kJ/mol   
4
48.00 kJ/mol   
23

Thermal Properties

Specific Heat
0.13 J/(kg K)   
39
0.19 J/(kg K)   
32

Molar Heat Capacity
25.10 J/mol·K   
99+
27.11 J/mol·K   
21

Thermal Conductivity
147.00 W/m·K   
10
13.40 W/m·K   
99+

Critical Temperature
Not Available   
Not Available   

Thermal Expansion
6.40 µm/(m·K)   
99+
12.10 µm/(m·K)   
32

Enthalpy
  
  

Enthalpy of Vaporization
799.10 kJ/mol   
1
399.60 kJ/mol   
17

Enthalpy of Fusion
35.23 kJ/mol   
1
6.20 kJ/mol   
99+

Enthalpy of Atomization
837.00 kJ/mol   
1
431.00 kJ/mol   
16

Standard Molar Entropy
35.50 J/mol.K   
99+
56.90 J/mol.K   
23

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