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Thorium vs Iridium

Thorium
Iridium
Iridium vs Thorium


Periodic Table
Symbol
Th   
Ir   
Group Number
0   
18
9   
9
Period Number
7   
6   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440326   
99+
7439885   
99+
Space Group Name
P63/mmc   
Fm_ 3m   
Space Group Number
194.00   
5
225.00   
2
Facts
Interesting Facts
  • Thorium metal is used as an alternate option over Uranium for nuclear fuel.
  • Thorium metals appearance (silvery white, soft) is somewhat similar to Lead metal.
  
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
Sources
Found in Minerals, Mining   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Jöns Jakob Berzelius   
Smithson Tennant   
Discovery
In 1829   
In 1803   
Abundance
  
  
Abundance In Universe
3 * 10-4 %   
9
2 * 10-7 %   
22
Abundance In Sun
~0.0004 %   
9
~0.0000002 %   
25
Abundance In Meteorites
0.05 %   
11
0.00 %   
29
Abundance In Earth's Crust
0.66 %   
7
0.00 %   
99+
Abundance In Oceans
0.00 %   
15
Not Available   
Uses
Uses & Benefits
  • Thorium metal is used as an allying agent for Magnesium, It imparts greater strength and resistance to temperature.
  • compound of this metal Thorium oxide is used as an industrial catalyst.
  
  • 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.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
Dentistry, Surgical Instruments Manufacturing   
NA   
Other Uses
Alloys, Jewellery, Sculptures, Statues   
Alloys   
Biological Properties
  
  
Toxicity
Non Toxic   
Toxic   
Present in Human Body
Yes   
Yes   
In Blood
0.00 Blood/mg dm-3   
33
Not Available   
In Bone
0.02 p.p.m.   
29
Not Available   
Physical Properties
Melting Point
1,750.00 °C   
17
2,410.00 °C   
7
Boiling Point
4,790.00 °C   
8
4,527.00 °C   
10
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery White   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
3.00   
12
6.50   
5
Brinell Hardness
390.00 MPa   
29
1,670.00 MPa   
5
Vickers Hardness
295.00 MPa   
29
1,760.00 MPa   
3
Speed of Sound
2,490.00 m/s   
36
4,825.00 m/s   
13
Optical Properties
  
  
Reflectivity
Not Available   
78.00 %   
6
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
Th   
Ir   
Isotopes
  
  
Known Isotopes
28   
11
34   
5
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
2.20   
4
Allred Rochow Electronegativity
1.11   
29
1.55   
11
Allen Electronegativity
Not Available   
1.68   
17
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
1.80   
99+
Ionization Energies
  
  
1st Energy Level
587.00 kJ/mol   
99+
880.00 kJ/mol   
9
2nd Energy Level
1,110.00 kJ/mol   
99+
1,600.00 kJ/mol   
35
3rd Energy Level
1,978.00 kJ/mol   
99+
Not Available   
4th Energy Level
2,780.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
2.16 g/amp-hr   
24
1.14 g/amp-hr   
99+
Electron Work Function
3.41 eV   
32
4.55 eV   
13
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity   
Flammable, Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
90   
28
77   
39
Electron Configuration
[Rn] 6d2 7s2   
[Xe] 4f14 5d7 6s2   
Crystal Structure
Face Centered Cubic (FCC)   
Face Centered Cubic (FCC)   
Crystal Lattice
FCC-Crystal-Structure-of-Thorium.jpg#100   
FCC-Crystal-Structure-of-Iridium.jpg#100   
Atom
  
  
Number of Protons
90   
28
74   
99+
Number of Neutrons
142   
15
110   
27
Number of Electrons
90   
28
74   
99+
Radius of an Atom
  
  
Atomic Radius
179.80 pm   
15
136.00 pm   
99+
Covalent Radius
206.00 pm   
7
141.00 pm   
99+
Van der Waals Radius
237.00 pm   
15
202.00 pm   
27
Atomic Weight
232.04 amu   
23
192.22 amu   
34
Atomic Volume
19.90 cm3/mol   
20
9.53 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Actinium
  
Osmium
  
Next Element
Protactinium
  
Platinum
  
Valence Electron Potential
59.30 (-eV)   
23
140.00 (-eV)   
5
Lattice Constant
508.42 pm   
14
383.90 pm   
26
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
11.72 g/cm3   
32
22.56 g/cm3   
10
Density When Liquid (at m.p.)
Not Available   
19.00 g/cm3   
3
Tensile Strength
Not Available   
2,000.00 MPa   
2
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.00 (Pa)   
22
0.00 (Pa)   
25
Elasticity properties
  
  
Shear Modulus
31.00 GPa   
21
210.00 GPa   
2
Bulk Modulus
54.00 GPa   
22
320.00 GPa   
3
Young's Modulus
79.00 GPa   
24
528.00 GPa   
1
Poisson Ratio
0.27   
20
0.26   
22
Other Mechanical Properties
Ductile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
11.70   
23
21.78   
3
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Superconductor   
Conductor   
Resistivity
157.00 nΩ·m   
22
47.10 nΩ·m   
99+
Electrical Conductivity
0.07 106/cm Ω   
31
0.19 106/cm Ω   
10
Electron Affinity
Not Available   
151.00 kJ/mol   
4
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.13 J/(kg K)   
39
Molar Heat Capacity
26.23 J/mol·K   
30
25.10 J/mol·K   
99+
Thermal Conductivity
54.00 W/m·K   
28
147.00 W/m·K   
10
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
11.00 µm/(m·K)   
36
6.40 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
429.00 kJ/mol   
15
799.10 kJ/mol   
1
Enthalpy of Fusion
15.48 kJ/mol   
19
35.23 kJ/mol   
1
Enthalpy of Atomization
468.60 kJ/mol   
15
837.00 kJ/mol   
1
Standard Molar Entropy
27.30 J/mol.K   
99+
35.50 J/mol.K   
99+
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