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Francium Iridium Comparison


Iridium Francium comparison


Periodic Table

Symbol
Fr   
Ir   

Group Number
1   
17
9   
9

Period Number
7   
6   

Block
s block   
d block   

Element Family
Alkali   
Transition Metal   

CAS Number
7440735   
18
7439885   
99+

Space Group Name
Not Available   
Fm_ 3m   

Space Group Number
Not Available   
225.00   
2

Facts

Interesting Facts
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  

Sources
Formed by Decay Process, Mining   
Found in Minerals, Mining, Ores of Minerals   

History
  
  

Who Discovered
Marguerite Perey   
Smithson Tennant   

Discovery
In 1939   
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
  • Francium has no known uses as it has a half life of only 22 minutes.
  
  • 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
NA   
Alloys   

Biological Properties
  
  

Toxicity
NA   
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
27.00 °C   
99+
2,410.00 °C   
7

Boiling Point
677.00 °C   
99+
4,527.00 °C   
10

Appearance
  
  

Physical State
Solid   
Solid   

Color
NA   
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
Fr   
Ir   

Isotopes
  
  

Known Isotopes
33   
6
34   
5

Electronegativity
  
  

Pauling Electronegativity
0.70   
99+
2.20   
4

Allred Rochow Electronegativity
0.86   
99+
1.55   
11

Mulliken-Jaffe Electronegativity
0.68   
25
Not Available   

Allen Electronegativity
0.67   
99+
1.68   
17

Electropositivity
  
  

Pauling Electropositivity
3.30   
1
1.80   
99+

Ionization Energies
  
  

1st Energy Level
380.00 kJ/mol   
99+
880.00 kJ/mol   
9

2nd Energy Level
Not Available   
1,600.00 kJ/mol   
35

Electrochemical Equivalent
8.32 g/amp-hr   
1
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
87   
31
77   
39

Electron Configuration
[Rn] 7s1   
[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
87   
31
74   
99+

Number of Neutrons
136   
17
110   
27

Number of Electrons
87   
31
74   
99+

Radius of an Atom
  
  

Atomic Radius
Not Available   
136.00 pm   
99+

Covalent Radius
260.00 pm   
1
141.00 pm   
99+

Van der Waals Radius
348.00 pm   
1
202.00 pm   
27

Atomic Weight
223.00 amu   
27
192.22 amu   
34

Atomic Volume
Not Available   
9.53 cm3/mol   
99+

Adjacent Atomic Numbers
  
  

Previous Element
Polonium
  
Osmium
  

Next Element
Radium
  
Platinum
  

Valence Electron Potential
8.00 (-eV)   
99+
140.00 (-eV)   
5

Lattice Constant
Not Available   
383.90 pm   
26

Lattice Angles
NA   
π/2, π/2, π/2   

Lattice C/A Ratio
Not Available   
Not Available   

Mechanical Properties

Density
  
  

Density At Room Temperature
1.87 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
Not Available   
21.78   
3

Magnetic Ordering
Paramagnetic   
Paramagnetic   

Electrical Properties
  
  

Electrical Property
Poor Conductor   
Conductor   

Resistivity
3.00 nΩ·m   
99+
47.10 nΩ·m   
99+

Electrical Conductivity
0.03 106/cm Ω   
40
0.19 106/cm Ω   
10

Electron Affinity
Not Available   
151.00 kJ/mol   
4

Thermal Properties

Specific Heat
Not Available   
0.13 J/(kg K)   
39

Molar Heat Capacity
Not Available   
25.10 J/mol·K   
99+

Thermal Conductivity
15.00 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
71.00 kJ/mol   
99+
837.00 kJ/mol   
1

Standard Molar Entropy
Not Available   
35.50 J/mol.K   
99+

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