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Protactinium vs Mercury

Protactinium
Mercury
Mercury vs Protactinium


Periodic Table
Symbol
Pa   
Hg   
Group Number
Not Available   
12   
6
Period Number
7   
6   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440133   
99+
7439976   
99+
Space Group Name
I4/mmm   
R_ 3m   
Space Group Number
139.00   
8
166.00   
6
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • 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
Found in Uranium Ores, Mining, Ores of metals   
Mining, Ores of Minerals   
History
  
  
Who Discovered
William Crookes   
Ancient Chinese and Indians   
Discovery
In 1900   
Before 2000 BCE   
Abundance
  
  
Abundance In Earth's Crust
0.00 %   
99+
0.05 %   
9
Abundance In Oceans
0.00 %   
99+
Not Available   
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • 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
NA   
Electrical Industry, Electronic Industry   
Medical Uses
NA   
Dentistry   
Other Uses
NA   
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   
37
0.01 Blood/mg dm-3   
23
In Bone
0.00 p.p.m.   
36
0.45 p.p.m.   
19
Physical Properties
Melting Point
1,568.00 °C   
21
Not Available   
Boiling Point
4,027.00 °C   
12
356.58 °C   
99+
Appearance
  
  
Physical State
Solid   
Liquid   
Color
Silver   
Silver   
Luster
Metallic   
NA   
Hardness
  
  
Speed of Sound
Not Available   
1,451.40 m/s   
99+
Optical Properties
  
  
Refractive Index
Not Available   
1.00   
3
Reflectivity
Not Available   
73.00 %   
8
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
Pa   
Hg   
Isotopes
  
  
Known Isotopes
27   
12
34   
5
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
2.00   
7
Sanderson Electronegativity
Not Available   
2.20   
7
Allred Rochow Electronegativity
1.14   
28
1.44   
17
Mulliken-Jaffe Electronegativity
Not Available   
1.81   
9
Allen Electronegativity
Not Available   
1.44   
30
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
2.00   
99+
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
1,007.10 kJ/mol   
4
2nd Energy Level
1,128.00 kJ/mol   
99+
1,810.00 kJ/mol   
20
3rd Energy Level
1,814.00 kJ/mol   
99+
3,300.00 kJ/mol   
20
4th Energy Level
2,991.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.72 g/amp-hr   
99+
3.74 g/amp-hr   
10
Electron Work Function
Not Available   
4.49 eV   
15
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Flammability, Ionization, Solubility   
Atomic Properties
Atomic Number
91   
27
80   
36
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Xe] 4f14 5d10 6s2   
Crystal Structure
Tetragonal (TETR)   
Rhombohedral (RHO)   
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
RHO-Crystal-Structure-of-Mercury.jpg#100   
Atom
  
  
Number of Protons
91   
27
80   
36
Number of Neutrons
122   
21
121   
22
Number of Electrons
91   
27
80   
36
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
151.00 pm   
32
Covalent Radius
200.00 pm   
11
132.00 pm   
99+
Van der Waals Radius
243.00 pm   
11
155.00 pm   
99+
Atomic Weight
231.04 amu   
24
200.59 amu   
32
Atomic Volume
15.00 cm3/mol   
34
14.82 cm3/mol   
35
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Gold
  
Next Element
Uranium
  
Thallium
  
Valence Electron Potential
92.00 (-eV)   
11
28.20 (-eV)   
99+
Lattice Constant
392.50 pm   
23
300.50 pm   
99+
Lattice Angles
π/2, π/2, π/2   
NA   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
15.37 g/cm3   
20
13.53 g/cm3   
24
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
0.00   
1
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Unknown   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
15.37   
12
13.53   
16
Magnetic Ordering
Paramagnetic   
Diamagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
177.00 nΩ·m   
21
961.00 nΩ·m   
1
Electrical Conductivity
0.05 106/cm Ω   
34
0.01 106/cm Ω   
99+
Electron Affinity
Not Available   
0.00 kJ/mol   
40
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.14 J/(kg K)   
38
Molar Heat Capacity
Not Available   
27.98 J/mol·K   
13
Thermal Conductivity
47.00 W/m·K   
32
8.30 W/m·K   
99+
Critical Temperature
Not Available   
1,750.00 K   
6
Thermal Expansion
9.90 µm/(m·K)   
40
60.40 µm/(m·K)   
5
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
56.90 kJ/mol   
99+
Enthalpy of Fusion
12.34 kJ/mol   
28
2.29 kJ/mol   
99+
Enthalpy of Atomization
Not Available   
61.50 kJ/mol   
99+
Standard Molar Entropy
198.10 J/mol.K   
1
75.80 J/mol.K   
6
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