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Radium vs Iridium

Radium
Iridium
Iridium vs Radium


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