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Polonium Mercury Comparison

Polonium
Mercury
Mercury Polonium comparison


Periodic Table
Symbol
Po  
Hg  
Group Number
16  
2
12  
6
Period Number
6  
6  
Block
p block  
d block  
Element Family
Post-​Transition  
Transition Metal  
CAS Number
7440086  
99+
7439976  
99+
Space Group Name
Pm-3m  
R_ 3m  
Space Group Number
221.00  
4
166.00  
9
Facts
Interesting Facts
  • 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.
  
  • At room temperature mercury is found in a liquid state.
  • A coin of pound or rupees floats in mercury.
  • Because of its low melting point and boiling point it is used in thermometers.
  
Sources
Mining, Ores of metals  
Mining, Ores of Minerals  
History
  
  
Who Discovered
Pierre Curie and Marie Curie  
Ancient Chinese and Indians  
Discovery
In 1898  
Before 2000 BCE  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.09 %  
2
Abundance In Sun
-  
0.00 %  
30
Abundance In Meteorites
-  
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.05 %  
9
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • 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.
  
  • It is a liquid metal at room temperature, but it is a toxic heavy metal and hence many uses of mercury are under review or phased out.
  • It is manly used as a catalysts in chemical industry.
  
Industrial Uses
Aerospace Industry, Ammunition Industry  
Electrical Industry, Electronic Industry  
Medical Uses
-  
Dentistry  
Other Uses
Alloys  
Alloys, Mirror Manufacturing, Pharmaceutical Industry  
Biological Properties
  
  
Toxicity
Highly Toxic  
Highly Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.01 Blood/mg dm-3  
23
In Bone
0.00 p.p.m.  
99+
0.45 p.p.m.  
23
Physical
Melting Point
254.00 °C  
99+
-38.83 °C  
99+
Boiling Point
962.00 °C  
99+
356.58 °C  
99+
Appearance
  
  
Physical State
Solid  
Liquid  
Color
Silver  
Silver  
Luster
-  
-  
Hardness
  
  
Mohs Hardness
2.50  
15
1.50  
19
Brinell Hardness
70.00 MPa  
99+
5.00 MPa  
99+
Vickers Hardness
30.00 MPa  
99+
0.00 MPa  
99+
Speed of Sound
2,260.00 m/s  
99+
1,451.40 m/s  
99+
Optical Properties
  
  
Refractive Index
2.70  
3
1.00  
99+
Reflectivity
50.00 %  
31
73.00 %  
10
Allotropes
Yes  
No  
α Allotropes
α-polonium  
-  
β Allotropes
β-polonium  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Po  
Hg  
Isotopes
  
  
Known Isotopes
29  
10
34  
5
Electronegativity
  
  
Pauling Electronegativity
2.00  
8
2.00  
8
Sanderson Electronegativity
2.00  
10
2.20  
8
Allred Rochow Electronegativity
1.76  
3
1.44  
18
Mulliken-Jaffe Electronegativity
2.48  
1
1.81  
17
Allen Electronegativity
2.19  
2
1.44  
34
Electropositivity
  
  
Pauling Electropositivity
2.00  
99+
2.00  
99+
Ionization Energies
  
  
1st Energy Level
812.10 kJ/mol  
14
1,007.10 kJ/mol  
4
2nd Energy Level
1,833.20 kJ/mol  
17
1,810.00 kJ/mol  
21
3rd Energy Level
812.10 kJ/mol  
99+
3,300.00 kJ/mol  
20
4th Energy Level
8,121.00 kJ/mol  
7
1,007.10 kJ/mol  
99+
5th Energy Level
8,120.00 kJ/mol  
12
1,007.00 kJ/mol  
99+
6th Energy Level
8,120.00 kJ/mol  
32
1,007.00 kJ/mol  
99+
7th Energy level
8,120.00 kJ/mol  
26
1,007.00 kJ/mol  
99+
8th Energy Level
8,120.00 kJ/mol  
26
1,007.00 kJ/mol  
99+
9th Energy Level
8,120.00 kJ/mol  
23
1,007.00 kJ/mol  
99+
10th Energy Level
8,120.00 kJ/mol  
27
1,007.00 kJ/mol  
99+
11th Energy Level
8,120.00 kJ/mol  
26
1,007.00 kJ/mol  
99+
12th Energy Level
8,120.00 kJ/mol  
99+
1,007.00 kJ/mol  
99+
13th Energy Level
8,120.00 kJ/mol  
19
1,007.00 kJ/mol  
99+
14th Energy Level
8,120.00 kJ/mol  
18
1,007.00 kJ/mol  
99+
15th Energy Level
81,200.00 kJ/mol  
15
100,700.00 kJ/mol  
1
16th Energy Level
81,200.00 kJ/mol  
12
1,007.00 kJ/mol  
99+
17th Energy Level
812.10 kJ/mol  
32
1,007.00 kJ/mol  
24
18th Energy Level
8,120.00 kJ/mol  
21
1,007.00 kJ/mol  
99+
19th Energy Level
812.10 kJ/mol  
29
1,007.10 kJ/mol  
20
20th Energy Level
812.00 kJ/mol  
22
1,007.00 kJ/mol  
11
21st Energy Level
812.10 kJ/mol  
40
1,007.00 kJ/mol  
33
22nd Energy Level
812.00 kJ/mol  
17
1,007.00 kJ/mol  
8
23rd Energy Level
812.10 kJ/mol  
99+
1,007.00 kJ/mol  
36
24th Energy Level
812.10 kJ/mol  
13
1,007.10 kJ/mol  
3
25th Energy Level
812.10 kJ/mol  
11
1,007.10 kJ/mol  
3
26th Energy Level
812.10 kJ/mol  
11
1,007.10 kJ/mol  
3
27th Energy Level
812.10 kJ/mol  
10
1,007.10 kJ/mol  
2
28th Energy Level
812.10 kJ/mol  
16
1,007.10 kJ/mol  
5
29th Energy Level
812.10 kJ/mol  
15
1,007.10 kJ/mol  
6
30th Energy Level
812.00 kJ/mol  
11
1,007.10 kJ/mol  
3
Electrochemical Equivalent
3.90 g/amp-hr  
8
3.74 g/amp-hr  
10
Electron Work Function
4.50 eV  
19
4.49 eV  
20
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Flammability, Ionization, Solubility  
Atomic
Atomic Number
84  
32
80  
36
Electron Configuration
[Xe] 4f14 5d10 6s2 6p4  
[Xe] 4f14 5d10 6s2  
Crystal Structure
Monoclinic (MON)  
Rhombohedral (RHO)  
Crystal Lattice
MON-Crystal-Structure-of-Polonium.jpg#100  
RHO-Crystal-Structure-of-Mercury.jpg#100  
Atom
  
  
Number of Protons
84  
32
80  
36
Number of Neutrons
125  
20
121  
23
Number of Electrons
84  
32
80  
36
Radius of an Atom
  
  
Atomic Radius
168.00 pm  
25
151.00 pm  
34
Covalent Radius
140.00 pm  
99+
132.00 pm  
99+
Van der Waals Radius
197.00 pm  
36
155.00 pm  
99+
Atomic Weight
209.00 amu  
28
200.59 amu  
32
Atomic Volume
22.23 cm3/mol  
22
14.82 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Bismuth
  
Gold
  
Next Element
Francium
  
Thallium
  
Valence Electron Potential
9.30 (-eV)  
99+
28.20 (-eV)  
99+
Lattice Constant
335.90 pm  
99+
300.50 pm  
99+
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.46  
99+
0.42  
99+
Mechanical
Density
  
  
Density At Room Temperature
9.20 g/cm3  
99+
13.53 g/cm3  
25
Density When Liquid (at m.p.)
9.40 g/cm3  
99+
13.55 g/cm3  
27
Tensile Strength
50.00 MPa  
38
15.00 MPa  
99+
Viscosity
0.00  
26
0.00  
4
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
37
0.00 (Pa)  
99+
Elasticity properties
  
  
Shear Modulus
24.00 GPa  
40
30.00 GPa  
27
Bulk Modulus
46.00 GPa  
28
25.00 GPa  
99+
Young's Modulus
46.00 GPa  
99+
45.00 GPa  
99+
Poisson Ratio
0.23  
30
0.44  
3
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
9.32  
99+
13.53  
27
Magnetic Ordering
Nonmagnetic  
Diamagnetic  
Permeability
0.00 H/m  
15
0.00 H/m  
10
Susceptibility
0.00  
24
0.00  
20
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
0.40 nΩ·m  
99+
961.00 nΩ·m  
1
Electrical Conductivity
0.02 106/cm Ω  
99+
0.01 106/cm Ω  
99+
Electron Affinity
183.30 kJ/mol  
3
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.14 J/(kg K)  
39
Molar Heat Capacity
26.40 J/mol·K  
36
27.98 J/mol·K  
16
Thermal Conductivity
20.00 W/m·K  
99+
8.30 W/m·K  
99+
Critical Temperature
527.00 K  
99+
1,750.00 K  
33
Thermal Expansion
23.50 µm/(m·K)  
16
60.40 µm/(m·K)  
5
Enthalpy
  
  
Enthalpy of Vaporization
60.30 kJ/mol  
99+
56.90 kJ/mol  
99+
Enthalpy of Fusion
13.00 kJ/mol  
32
2.29 kJ/mol  
99+
Enthalpy of Atomization
134.00 kJ/mol  
99+
61.50 kJ/mol  
99+
Standard Molar Entropy
41.10 J/mol.K  
99+
75.80 J/mol.K  
6
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