Home

Transition Metals + -

Actinide Metals + -

Lanthanide Metals + -

Post-Transition Metals + -

Alkaline Earth Metals + -

Compare Metals

Osmium vs Polonium

Osmium
Polonium
Polonium vs Osmium


Periodic Table
Symbol
Os   
Po   
Group Number
8   
10
16   
2
Period Number
6   
6   
Block
d block   
p block   
Element Family
Transition Metal   
Post-​Transition   
CAS Number
7440042   
99+
7440086   
99+
Space Group Name
P63/mmc   
Pm-3m   
Space Group Number
194.00   
5
221.00   
3
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.
  
  • Polonium was the first radioactive element to be discovered.
  • Polonium element and its compounds are highly radioactive.
  • Its alloy with Beryllium provides source of neutrons.
  
Sources
Found As a By-product, Found in Minerals, Mining   
Mining, Ores of metals   
History
  
  
Who Discovered
Smithson Tennant   
Pierre Curie and Marie Curie   
Discovery
In 1803   
In 1898   
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   
Abundance In Oceans
Not Available   
0.00 %   
99+
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.
  
  • Polonium metal has different Allotropes, it is used in antistatic devices and for research purpose.
  • A 1 gram of Polonium can reach a temperature of 500°C, hence it is used as a heat source for space equipment.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Aerospace Industry, Ammunition Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Highly Toxic   
Highly Toxic   
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
254.00 °C   
99+
Boiling Point
5,027.00 °C   
6
962.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery Bluish-Gray   
Silver   
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   
Yes   
α Allotropes
Not Available   
α-polonium   
β Allotropes
Not Available   
β-polonium   
γ Allotropes
Not Available   
Not Available   
Chemical Properties
Chemical Formula
Os   
Po   
Isotopes
  
  
Known Isotopes
35   
4
29   
10
Electronegativity
  
  
Pauling Electronegativity
2.20   
4
2.00   
7
Allred Rochow Electronegativity
1.52   
12
1.76   
2
Mulliken-Jaffe Electronegativity
Not Available   
2.48   
1
Allen Electronegativity
1.65   
19
2.19   
2
Electropositivity
  
  
Pauling Electropositivity
1.80   
99+
2.00   
99+
Ionization Energies
  
  
1st Energy Level
840.00 kJ/mol   
12
812.10 kJ/mol   
14
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
3.90 g/amp-hr   
8
Electron Work Function
4.83 eV   
8
Not Available   
Other Chemical Properties
Chemical Stability, Ionization, Solubility   
Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
76   
40
84   
32
Electron Configuration
[Xe] 4f14 5d6 6s2   
[Xe] 4f14 5d10 6s2 6p4   
Crystal Structure
Hexagonal Close Packed (HCP)   
Monoclinic (MON)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
MON-Crystal-Structure-of-Polonium.jpg#100   
Atom
  
  
Number of Protons
76   
39
84   
32
Number of Neutrons
114   
25
125   
19
Number of Electrons
76   
39
84   
32
Radius of an Atom
  
  
Atomic Radius
133.80 pm   
99+
168.00 pm   
23
Covalent Radius
Not Available   
140.00 pm   
99+
Van der Waals Radius
216.00 pm   
24
197.00 pm   
29
Atomic Weight
190.23 amu   
35
209.00 amu   
28
Atomic Volume
8.49 cm3/mol   
99+
22.23 cm3/mol   
13
Adjacent Atomic Numbers
  
  
Previous Element
Rhenium
  
Bismuth
  
Next Element
Iridium
  
Francium
  
Valence Electron Potential
91.40 (-eV)   
12
Not Available   
Lattice Constant
273.44 pm   
99+
335.90 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
1.58   
14
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
22.59 g/cm3   
9
9.20 g/cm3   
99+
Density When Liquid (at m.p.)
20.00 g/cm3   
1
9.40 g/cm3   
19
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
9.32   
31
Magnetic Ordering
Paramagnetic   
Nonmagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
81.20 nΩ·m   
35
0.40 nΩ·m   
99+
Electrical Conductivity
0.11 106/cm Ω   
18
0.02 106/cm Ω   
99+
Electron Affinity
106.10 kJ/mol   
9
183.30 kJ/mol   
3
Thermal Properties
Specific Heat
0.13 J/(kg K)   
39
0.12 J/(kg K)   
40
Molar Heat Capacity
24.70 J/mol·K   
99+
26.40 J/mol·K   
28
Thermal Conductivity
87.60 W/m·K   
19
20.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
5.10 µm/(m·K)   
99+
23.50 µm/(m·K)   
16
Enthalpy
  
  
Enthalpy of Vaporization
627.60 kJ/mol   
7
60.30 kJ/mol   
99+
Enthalpy of Fusion
29.30 kJ/mol   
4
13.00 kJ/mol   
26
Enthalpy of Atomization
669.00 kJ/mol   
6
134.00 kJ/mol   
99+
Standard Molar Entropy
32.60 J/mol.K   
99+
Not Available   
Periodic Table >>
<< All

Compare Transition Metals

Transition Metals

Transition Metals

» More Transition Metals

Compare Transition Metals

» More Compare Transition Metals
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!