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Iridium vs Radium

Iridium
Radium
Radium vs Iridium


Periodic Table
Symbol
Ir  
Ra  
Group Number
9  
9
2  
16
Period Number
6  
7  
Block
d block  
s block  
Element Family
Transition Metal  
Alkaline Earth  
CAS Number
7439885  
99+
7440144  
99+
Space Group Name
Fm_ 3m  
Im_ 3m  
Space Group Number
225.00  
3
229.00  
2
Facts
Interesting Facts
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
  • Radium metal is the heaviest metal of Alkaline earth metals column.
  • Radium metal is highly radioactive and does not have any stable isotopes.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Mining, Ores of metals  
History
  
  
Who Discovered
Smithson Tennant  
-  
Discovery
In 1803  
In 1898  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
40
Abundance In Sun
0.00 %  
25
0.00 %  
26
Abundance In Meteorites
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 %  
23
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 is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
  • It is used in luminous paints.
  
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
Pharmaceutical Industry  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Toxic  
Highly Toxic  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
34
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
2,410.00 °C  
7
700.00 °C  
99+
Boiling Point
4,527.00 °C  
10
1,737.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.50  
5
1.00  
22
Brinell Hardness
1,670.00 MPa  
5
700.00 MPa  
17
Vickers Hardness
1,760.00 MPa  
8
140.00 MPa  
99+
Speed of Sound
4,825.00 m/s  
17
3,150.00 m/s  
37
Optical Properties
  
  
Refractive Index
2.40  
7
1.00  
99+
Reflectivity
78.00 %  
8
83.00 %  
6
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ir  
Ra  
Isotopes
  
  
Known Isotopes
34  
5
33  
6
Electronegativity
  
  
Pauling Electronegativity
2.20  
5
0.90  
99+
Sanderson Electronegativity
2.20  
8
0.89  
99+
Allred Rochow Electronegativity
1.55  
12
0.97  
39
Mulliken-Jaffe Electronegativity
2.20  
6
0.92  
99+
Allen Electronegativity
1.68  
20
0.89  
99+
Electropositivity
  
  
Pauling Electropositivity
1.80  
99+
3.10  
5
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol  
9
509.30 kJ/mol  
99+
2nd Energy Level
1,600.00 kJ/mol  
36
979.00 kJ/mol  
99+
3rd Energy Level
2,256.10 kJ/mol  
99+
509.30 kJ/mol  
99+
4th Energy Level
880.00 kJ/mol  
99+
5,093.00 kJ/mol  
27
5th Energy Level
8,800.00 kJ/mol  
8
5,090.00 kJ/mol  
99+
6th Energy Level
8,800.00 kJ/mol  
25
5,090.00 kJ/mol  
99+
7th Energy level
8,800.00 kJ/mol  
22
5,090.00 kJ/mol  
99+
8th Energy Level
8,800.00 kJ/mol  
22
5,090.00 kJ/mol  
99+
9th Energy Level
8,800.00 kJ/mol  
21
5,090.00 kJ/mol  
99+
10th Energy Level
8,800.00 kJ/mol  
23
5,090.00 kJ/mol  
99+
11th Energy Level
8,800.00 kJ/mol  
20
5,090.00 kJ/mol  
99+
12th Energy Level
8,800.00 kJ/mol  
40
5,090.00 kJ/mol  
99+
13th Energy Level
8,800.00 kJ/mol  
15
5,090.00 kJ/mol  
99+
14th Energy Level
8,800.00 kJ/mol  
14
5,090.00 kJ/mol  
99+
15th Energy Level
88,000.00 kJ/mol  
8
50,900.00 kJ/mol  
99+
16th Energy Level
88,000.00 kJ/mol  
9
50,900.00 kJ/mol  
99+
17th Energy Level
880.00 kJ/mol  
26
509.30 kJ/mol  
99+
18th Energy Level
8,800.00 kJ/mol  
15
5,090.00 kJ/mol  
99+
19th Energy Level
880.00 kJ/mol  
24
509.30 kJ/mol  
99+
20th Energy Level
880.00 kJ/mol  
14
509.00 kJ/mol  
99+
21st Energy Level
880.00 kJ/mol  
37
509.30 kJ/mol  
99+
22nd Energy Level
880.00 kJ/mol  
12
509.00 kJ/mol  
99+
23rd Energy Level
8,800.00 kJ/mol  
7
509.30 kJ/mol  
99+
24th Energy Level
880.00 kJ/mol  
8
509.30 kJ/mol  
99+
25th Energy Level
880.00 kJ/mol  
6
509.00 kJ/mol  
99+
26th Energy Level
880.00 kJ/mol  
6
509.30 kJ/mol  
99+
27th Energy Level
880.00 kJ/mol  
5
509.30 kJ/mol  
99+
28th Energy Level
880.00 kJ/mol  
8
509.30 kJ/mol  
99+
29th Energy Level
880.00 kJ/mol  
9
509.30 kJ/mol  
99+
30th Energy Level
880.00 kJ/mol  
6
509.00 kJ/mol  
99+
Electrochemical Equivalent
1.14 g/amp-hr  
99+
4.22 g/amp-hr  
6
Electron Work Function
4.55 eV  
18
4.30 eV  
25
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
77  
39
88  
30
Electron Configuration
[Xe] 4f14 5d7 6s2  
[Rn] 7s2  
Crystal Structure
Face Centered Cubic (FCC)  
Body Centered Cubic (BCC)  
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
74  
99+
88  
30
Number of Neutrons
110  
28
138  
17
Number of Electrons
74  
99+
88  
30
Radius of an Atom
  
  
Atomic Radius
136.00 pm  
99+
215.00 pm  
6
Covalent Radius
141.00 pm  
99+
221.00 pm  
3
Van der Waals Radius
202.00 pm  
34
283.00 pm  
5
Atomic Weight
192.22 amu  
34
226.00 amu  
26
Atomic Volume
9.53 cm3/mol  
99+
45.20 cm3/mol  
5
Adjacent Atomic Numbers
  
  
Previous Element
Osmium
  
Francium
  
Next Element
Platinum
  
Actinium
  
Valence Electron Potential
140.00 (-eV)  
5
20.10 (-eV)  
99+
Lattice Constant
383.90 pm  
29
514.80 pm  
15
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.58  
35
1.57  
99+
Mechanical
Density
  
  
Density At Room Temperature
22.56 g/cm3  
10
5.50 g/cm3  
99+
Density When Liquid (at m.p.)
19.00 g/cm3  
13
5.50 g/cm3  
99+
Tensile Strength
2,000.00 MPa  
2
40.00 MPa  
99+
Viscosity
0.00  
21
0.00  
2
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
16
Vapor Pressure at 2000 K
0.00 (Pa)  
26
0.00 (Pa)  
33
Elasticity properties
  
  
Shear Modulus
210.00 GPa  
2
25.00 GPa  
38
Bulk Modulus
320.00 GPa  
3
43.00 GPa  
33
Young's Modulus
528.00 GPa  
1
83.00 GPa  
25
Poisson Ratio
0.26  
22
0.31  
13
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
21.78  
12
5.00  
99+
Magnetic Ordering
Paramagnetic  
Nonmagnetic  
Permeability
0.00 H/m  
16
0.00 H/m  
9
Susceptibility
0.00  
5
0.00  
18
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
47.10 nΩ·m  
99+
100.00 nΩ·m  
31
Electrical Conductivity
0.19 106/cm Ω  
10
0.00 106/cm Ω  
99+
Electron Affinity
151.00 kJ/mol  
4
0.90 kJ/mol  
99+
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.12 J/(kg K)  
99+
Molar Heat Capacity
25.10 J/mol·K  
99+
20.05 J/mol·K  
99+
Thermal Conductivity
147.00 W/m·K  
10
18.60 W/m·K  
99+
Critical Temperature
2,719.00 K  
8
973.00 K  
99+
Thermal Expansion
6.40 µm/(m·K)  
99+
8.50 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol  
1
113.00 kJ/mol  
99+
Enthalpy of Fusion
35.23 kJ/mol  
1
8.60 kJ/mol  
99+
Enthalpy of Atomization
837.00 kJ/mol  
1
163.00 kJ/mol  
99+
Standard Molar Entropy
35.50 J/mol.K  
99+
71.00 J/mol.K  
14
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