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Actinium vs Iridium

Actinium
Iridium
Iridium vs Actinium


Periodic Table
Symbol
Ac  
Ir  
Group Number
3  
15
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  
3
225.00  
3
Facts
Interesting Facts
Actinium glows in the dark due to its radioactivity.  
  • 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
0.00 %  
34
0.00 %  
23
Abundance In Sun
0.00 %  
26
0.00 %  
25
Abundance In Meteorites
0.00 %  
99+
0.00 %  
29
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
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
-  
Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
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  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,227.00 °C  
38
2,410.00 °C  
7
Boiling Point
3,200.00 °C  
27
4,527.00 °C  
10
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
6.50  
5
6.50  
5
Brinell Hardness
70.00 MPa  
99+
1,670.00 MPa  
5
Vickers Hardness
260.00 MPa  
99+
1,760.00 MPa  
8
Speed of Sound
3,430.00 m/s  
32
4,825.00 m/s  
17
Optical Properties
  
  
Refractive Index
1.00  
99+
2.40  
7
Reflectivity
62.00 %  
21
78.00 %  
8
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ac  
Ir  
Isotopes
  
  
Known Isotopes
29  
10
34  
5
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
2.20  
5
Sanderson Electronegativity
1.10  
38
2.20  
8
Allred Rochow Electronegativity
1.00  
37
1.55  
12
Mulliken-Jaffe Electronegativity
1.10  
99+
2.20  
6
Allen Electronegativity
1.10  
99+
1.68  
20
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  
36
3rd Energy Level
1,900.00 kJ/mol  
99+
2,256.10 kJ/mol  
99+
4th Energy Level
4,700.00 kJ/mol  
33
880.00 kJ/mol  
99+
5th Energy Level
4,990.00 kJ/mol  
99+
8,800.00 kJ/mol  
8
6th Energy Level
5,750.00 kJ/mol  
99+
8,800.00 kJ/mol  
25
7th Energy level
5,750.00 kJ/mol  
99+
8,800.00 kJ/mol  
22
8th Energy Level
5,750.00 kJ/mol  
99+
8,800.00 kJ/mol  
22
9th Energy Level
4,990.00 kJ/mol  
99+
8,800.00 kJ/mol  
21
10th Energy Level
4,990.00 kJ/mol  
99+
8,800.00 kJ/mol  
23
11th Energy Level
4,990.00 kJ/mol  
99+
8,800.00 kJ/mol  
20
12th Energy Level
49,900.00 kJ/mol  
21
8,800.00 kJ/mol  
40
13th Energy Level
4,990.00 kJ/mol  
99+
8,800.00 kJ/mol  
15
14th Energy Level
4,990.00 kJ/mol  
99+
8,800.00 kJ/mol  
14
15th Energy Level
49,900.00 kJ/mol  
99+
88,000.00 kJ/mol  
8
16th Energy Level
49,900.00 kJ/mol  
99+
88,000.00 kJ/mol  
9
17th Energy Level
499.00 kJ/mol  
99+
880.00 kJ/mol  
26
18th Energy Level
4,990.00 kJ/mol  
99+
8,800.00 kJ/mol  
15
19th Energy Level
499.00 kJ/mol  
99+
880.00 kJ/mol  
24
20th Energy Level
499.00 kJ/mol  
99+
880.00 kJ/mol  
14
21st Energy Level
4,990.00 kJ/mol  
25
880.00 kJ/mol  
37
22nd Energy Level
499.00 kJ/mol  
99+
880.00 kJ/mol  
12
23rd Energy Level
4,990.00 kJ/mol  
29
8,800.00 kJ/mol  
7
24th Energy Level
499.00 kJ/mol  
99+
880.00 kJ/mol  
8
25th Energy Level
499.00 kJ/mol  
99+
880.00 kJ/mol  
6
26th Energy Level
499.00 kJ/mol  
99+
880.00 kJ/mol  
6
27th Energy Level
499.00 kJ/mol  
99+
880.00 kJ/mol  
5
28th Energy Level
499.00 kJ/mol  
99+
880.00 kJ/mol  
8
29th Energy Level
499.00 kJ/mol  
99+
880.00 kJ/mol  
9
30th Energy Level
499.00 kJ/mol  
99+
880.00 kJ/mol  
6
Electrochemical Equivalent
2.82 g/amp-hr  
22
1.14 g/amp-hr  
99+
Electron Work Function
4.38 eV  
23
4.55 eV  
18
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Flammable, Ionization, Radioactive Isotopes, Radioactivity  
Atomic
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  
17
110  
28
Number of Electrons
89  
29
74  
99+
Radius of an Atom
  
  
Atomic Radius
195.00 pm  
9
136.00 pm  
99+
Covalent Radius
186.00 pm  
21
141.00 pm  
99+
Van der Waals Radius
215.00 pm  
31
202.00 pm  
34
Atomic Weight
227.00 amu  
25
192.22 amu  
34
Atomic Volume
22.54 cm3/mol  
20
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  
9
383.90 pm  
29
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.89  
2
1.58  
35
Mechanical
Density
  
  
Density At Room Temperature
10.00 g/cm3  
40
22.56 g/cm3  
10
Density When Liquid (at m.p.)
10.07 g/cm3  
40
19.00 g/cm3  
13
Tensile Strength
65.00 MPa  
33
2,000.00 MPa  
2
Viscosity
0.00  
25
0.00  
21
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
26
Elasticity properties
  
  
Shear Modulus
25.00 GPa  
38
210.00 GPa  
2
Bulk Modulus
94.00 GPa  
17
320.00 GPa  
3
Young's Modulus
130.00 GPa  
16
528.00 GPa  
1
Poisson Ratio
0.34  
10
0.26  
22
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
10.07  
99+
21.78  
12
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
16
Susceptibility
0.00  
24
0.00  
5
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
5.20 nΩ·m  
99+
47.10 nΩ·m  
99+
Electrical Conductivity
0.15 106/cm Ω  
13
0.19 106/cm Ω  
10
Electron Affinity
33.20 kJ/mol  
34
151.00 kJ/mol  
4
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.13 J/(kg K)  
40
Molar Heat Capacity
27.20 J/mol·K  
24
25.10 J/mol·K  
99+
Thermal Conductivity
12.00 W/m·K  
99+
147.00 W/m·K  
10
Critical Temperature
1,323.00 K  
99+
2,719.00 K  
8
Thermal Expansion
12.10 µm/(m·K)  
99+
6.40 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
120.00 kJ/mol  
99+
799.10 kJ/mol  
1
Enthalpy of Fusion
14.20 kJ/mol  
28
35.23 kJ/mol  
1
Enthalpy of Atomization
301.00 kJ/mol  
99+
837.00 kJ/mol  
1
Standard Molar Entropy
56.50 J/mol.K  
33
35.50 J/mol.K  
99+
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