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Actinium vs Iridium

Actinium
Iridium
Iridium vs Actinium


Periodic Table
Symbol
Ac   
Ir   
Group Number
Not Available   
9   
9
Period Number
7   
6   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440348   
99+
7439885   
99+
Space Group Name
Fm_ 3m   
Fm_ 3m   
Space Group Number
225.00   
2
225.00   
2
Facts
Interesting Facts
Not Available   
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
Sources
Obtained by Treating Radium with Neutrons, Ores of metals   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Friedrich Oskar Giesel   
Smithson Tennant   
Discovery
In 1902   
In 1803   
Abundance
  
  
Abundance In Universe
Not Available   
2 * 10-7 %   
22
Abundance In Sun
~-9999 %   
~0.0000002 %   
25
Abundance In Meteorites
Not Available   
0.00 %   
29
Abundance In Earth's Crust
Not Available   
0.00 %   
99+
Uses
Uses & Benefits
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
  • 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
NA   
Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Toxic   
Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
In Bone
0.00 p.p.m.   
36
Not Available   
Physical Properties
Melting Point
1,227.00 °C   
38
2,410.00 °C   
7
Boiling Point
3,200.00 °C   
26
4,527.00 °C   
10
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery White   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
6.50   
5
Brinell Hardness
Not Available   
1,670.00 MPa   
5
Vickers Hardness
Not Available   
1,760.00 MPa   
3
Speed of Sound
Not Available   
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
Ac   
Ir   
Isotopes
  
  
Known Isotopes
29   
10
34   
5
Electronegativity
  
  
Pauling Electronegativity
1.10   
99+
2.20   
4
Allred Rochow Electronegativity
1.00   
36
1.55   
11
Allen Electronegativity
Not Available   
1.68   
17
Electropositivity
  
  
Pauling Electropositivity
2.90   
10
1.80   
99+
Ionization Energies
  
  
1st Energy Level
499.00 kJ/mol   
99+
880.00 kJ/mol   
9
2nd Energy Level
1,170.00 kJ/mol   
99+
1,600.00 kJ/mol   
35
3rd Energy Level
1,900.00 kJ/mol   
99+
Not Available   
4th Energy Level
4,700.00 kJ/mol   
23
Not Available   
Electrochemical Equivalent
2.82 g/amp-hr   
18
1.14 g/amp-hr   
99+
Electron Work Function
Not Available   
4.55 eV   
13
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Flammable, Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
89   
29
77   
39
Electron Configuration
[Rn] 6d1 7s2   
[Xe] 4f14 5d7 6s2   
Crystal Structure
Face Centered Cubic (FCC)   
Face Centered Cubic (FCC)   
Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100   
FCC-Crystal-Structure-of-Iridium.jpg#100   
Atom
  
  
Number of Protons
89   
29
74   
99+
Number of Neutrons
138   
16
110   
27
Number of Electrons
89   
29
74   
99+
Radius of an Atom
  
  
Atomic Radius
195.00 pm   
7
136.00 pm   
99+
Covalent Radius
Not Available   
141.00 pm   
99+
Van der Waals Radius
Not Available   
202.00 pm   
27
Atomic Weight
227.00 amu   
25
192.22 amu   
34
Atomic Volume
22.54 cm3/mol   
11
9.53 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Radium
  
Osmium
  
Next Element
Thorium
  
Platinum
  
Valence Electron Potential
38.60 (-eV)   
99+
140.00 (-eV)   
5
Lattice Constant
567.00 pm   
8
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
10.00 g/cm3   
37
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
Not Available   
0.00 (Pa)   
25
Elasticity properties
  
  
Shear Modulus
Not Available   
210.00 GPa   
2
Bulk Modulus
Not Available   
320.00 GPa   
3
Young's Modulus
Not Available   
528.00 GPa   
1
Poisson Ratio
Not Available   
0.26   
22
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
10.07   
28
21.78   
3
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
Not Available   
47.10 nΩ·m   
99+
Electrical Conductivity
Not Available   
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
27.20 J/mol·K   
18
25.10 J/mol·K   
99+
Thermal Conductivity
12.00 W/m·K   
99+
147.00 W/m·K   
10
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
6.40 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
799.10 kJ/mol   
1
Enthalpy of Fusion
Not Available   
35.23 kJ/mol   
1
Enthalpy of Atomization
301.00 kJ/mol   
36
837.00 kJ/mol   
1
Standard Molar Entropy
56.50 J/mol.K   
25
35.50 J/mol.K   
99+
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