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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   
1
225.00   
2
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
Not Available   
Smithson Tennant   
Discovery
In 1898   
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
0.00 %   
99+
0.00 %   
99+
Abundance In Oceans
0.00 %   
99+
Not Available   
Abundance In Humans
0.00 %   
20
Not Available   
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
NA   
Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
Pharmaceutical Industry   
NA   
Other Uses
NA   
Alloys   
Biological Properties
  
  
Toxicity
Highly Toxic   
Toxic   
Present in Human Body
No   
Yes   
Physical Properties
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
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
Ra   
Ir   
Isotopes
  
  
Known Isotopes
33   
6
34   
5
Electronegativity
  
  
Pauling Electronegativity
0.90   
99+
2.20   
4
Allred Rochow Electronegativity
0.97   
38
1.55   
11
Mulliken-Jaffe Electronegativity
0.92   
20
Not Available   
Allen Electronegativity
0.89   
99+
1.68   
17
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   
35
Electrochemical Equivalent
4.22 g/amp-hr   
6
1.14 g/amp-hr   
99+
Electron Work Function
Not Available   
4.55 eV   
13
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Flammable, Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
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   
16
110   
27
Number of Electrons
88   
30
74   
99+
Radius of an Atom
  
  
Atomic Radius
Not Available   
136.00 pm   
99+
Covalent Radius
221.00 pm   
3
141.00 pm   
99+
Van der Waals Radius
283.00 pm   
4
202.00 pm   
27
Atomic Weight
226.00 amu   
26
192.22 amu   
34
Atomic Volume
45.20 cm3/mol   
4
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   
13
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
5.50 g/cm3   
99+
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
5.00   
99+
21.78   
3
Magnetic Ordering
Nonmagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
NA   
Conductor   
Resistivity
100.00 nΩ·m   
31
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
Not Available   
25.10 J/mol·K   
99+
Thermal Conductivity
18.60 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
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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