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Osmium vs Francium


Francium vs Osmium


Periodic Table

Symbol
Os   
Fr   

Group Number
8   
10
1   
17

Period Number
6   
7   

Block
d block   
s block   

Element Family
Transition Metal   
Alkali   

CAS Number
7440042   
99+
7440735   
18

Space Group Name
P63/mmc   
Not Available   

Space Group Number
194.00   
5
Not Available   

Facts

Interesting Facts
  • Osmium metal does not oxidize in air unless it is heated.
  • But if it heated den it forms Osmium Tetroxide, which is highly toxic.
  
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  

Sources
Found As a By-product, Found in Minerals, Mining   
Formed by Decay Process, Mining   

History
  
  

Who Discovered
Smithson Tennant   
Marguerite Perey   

Discovery
In 1803   
In 1939   

Abundance
  
  

Abundance In Universe
3 * 10-7 %   
21
Not Available   

Abundance In Sun
~0.0000002 %   
25
~-9999 %   

Abundance In Meteorites
0.00 %   
28
Not Available   

Abundance In Earth's Crust
0.00 %   
99+
Not Available   

Uses

Uses & Benefits
  • Its has very limited uses and its alloys are very hard and are used in the manufacturing of pen tips, pivots, needles and electrical contacts.
  • It is also used as industrial catalyst to speed up the chemical reaction.
  
  • Francium has no known uses as it has a half life of only 22 minutes.
  

Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
NA   

Medical Uses
NA   
NA   

Other Uses
Alloys   
NA   

Biological Properties
  
  

Toxicity
Highly Toxic   
NA   

Present in Human Body
No   
No   

In Blood
Not Available   
0.00 Blood/mg dm-3   
37

In Bone
Not Available   
0.00 p.p.m.   
36

Physical Properties

Melting Point
3,045.00 °C   
3
27.00 °C   
99+

Boiling Point
5,027.00 °C   
6
677.00 °C   
99+

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silvery Bluish-Gray   
NA   

Luster
Metallic   
NA   

Hardness
  
  

Mohs Hardness
7.00   
3
Not Available   

Brinell Hardness
3,490.00 MPa   
1
Not Available   

Speed of Sound
4,940.00 m/s   
11
Not Available   

Optical Properties
  
  

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
Os   
Fr   

Isotopes
  
  

Known Isotopes
35   
4
33   
6

Electronegativity
  
  

Pauling Electronegativity
2.20   
4
0.70   
99+

Allred Rochow Electronegativity
1.52   
12
0.86   
99+

Mulliken-Jaffe Electronegativity
Not Available   
0.68   
25

Allen Electronegativity
1.65   
19
0.67   
99+

Electropositivity
  
  

Pauling Electropositivity
1.80   
99+
3.30   
1

Ionization Energies
  
  

1st Energy Level
840.00 kJ/mol   
12
380.00 kJ/mol   
99+

2nd Energy Level
1,309.80 kJ/mol   
99+
Not Available   

3rd Energy Level
1,600.00 kJ/mol   
99+
Not Available   

Electrochemical Equivalent
1.77 g/amp-hr   
38
8.32 g/amp-hr   
1

Electron Work Function
4.83 eV   
8
Not Available   

Other Chemical Properties
Chemical Stability, Ionization, Solubility   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   

Atomic Properties

Atomic Number
76   
40
87   
31

Electron Configuration
[Xe] 4f14 5d6 6s2   
[Rn] 7s1   

Crystal Structure
Hexagonal Close Packed (HCP)   
Body Centered Cubic (BCC)   

Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
BCC-Crystal-Structure-.jpg#100   

Atom
  
  

Number of Protons
76   
39
87   
31

Number of Neutrons
114   
25
136   
17

Number of Electrons
76   
39
87   
31

Radius of an Atom
  
  

Atomic Radius
133.80 pm   
99+
Not Available   

Covalent Radius
Not Available   
260.00 pm   
1

Van der Waals Radius
216.00 pm   
24
348.00 pm   
1

Atomic Weight
190.23 amu   
35
223.00 amu   
27

Atomic Volume
8.49 cm3/mol   
99+
Not Available   

Adjacent Atomic Numbers
  
  

Previous Element
Rhenium
  
Polonium
  

Next Element
Iridium
  
Radium
  

Valence Electron Potential
91.40 (-eV)   
12
8.00 (-eV)   
99+

Lattice Constant
273.44 pm   
99+
Not Available   

Lattice Angles
π/2, π/2, 2 π/3   
NA   

Lattice C/A Ratio
1.58   
14
Not Available   

Mechanical Properties

Density
  
  

Density At Room Temperature
22.59 g/cm3   
9
1.87 g/cm3   
99+

Density When Liquid (at m.p.)
20.00 g/cm3   
1
Not Available   

Tensile Strength
1,000.00 MPa   
4
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Vapor Pressure at 2000 K
0.00 (Pa)   
28
Not Available   

Elasticity properties
  
  

Shear Modulus
222.00 GPa   
1
Not Available   

Bulk Modulus
462.00 GPa   
1
Not Available   

Poisson Ratio
0.25   
24
Not Available   

Other Mechanical Properties
Ductile   
NA   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
22.57   
2
Not Available   

Magnetic Ordering
Paramagnetic   
Paramagnetic   

Electrical Properties
  
  

Electrical Property
Conductor   
Poor Conductor   

Resistivity
81.20 nΩ·m   
35
3.00 nΩ·m   
99+

Electrical Conductivity
0.11 106/cm Ω   
18
0.03 106/cm Ω   
40

Electron Affinity
106.10 kJ/mol   
9
Not Available   

Thermal Properties

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

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

Thermal Conductivity
87.60 W/m·K   
19
15.00 W/m·K   
99+

Critical Temperature
Not Available   
Not Available   

Thermal Expansion
5.10 µm/(m·K)   
99+
Not Available   

Enthalpy
  
  

Enthalpy of Vaporization
627.60 kJ/mol   
7
Not Available   

Enthalpy of Fusion
29.30 kJ/mol   
4
Not Available   

Enthalpy of Atomization
669.00 kJ/mol   
6
71.00 kJ/mol   
99+

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

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