Mercury Technetium Comparison
Periodic Table
Symbol
Hg
Tc
Group Number
12
6
7
11
Period Number
6
5
Block
d block
d block
Element Family
Transition Metal
Transition Metal
CAS Number
7439976
99+
7440268
99+
Space Group Name
R_ 3m
P63/mmc
Space Group Number
166.00
6
194.00
5
Facts
Interesting Facts
- 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.
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
Sources
Mining, Ores of Minerals
Made by Bombarding Molybdenum with Deuterons
History
Who Discovered
Ancient Chinese and Indians
Emilio Segrè and Carlo Perriero
Discovery
Before 2000 BCE
In 1937
Abundance
Abundance In Earth's Crust
0.05 %
9
Not Available
Uses
Uses & Benefits
- 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.
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
Industrial Uses
Electrical Industry, Electronic Industry
NA
Medical Uses
Dentistry
NA
Other Uses
Alloys, Mirror Manufacturing, Pharmaceutical Industry
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Highly Toxic
Low Toxic
Present in Human Body
Yes
No
In Blood
0.01 Blood/mg dm-3
23
0.00 Blood/mg dm-3
37
In Bone
0.45 p.p.m.
19
0.00 p.p.m.
36
Physical Properties
Melting Point
Not Available
2,200.00 °C
9
Boiling Point
356.58 °C
99+
4,877.00 °C
7
Appearance
Physical State
Liquid
Solid
Color
Silver
Shiny Gray
Luster
NA
NA
Hardness
Speed of Sound
1,451.40 m/s
99+
16,200.00 m/s
1
Optical Properties
Refractive Index
1.00
3
Not Available
Reflectivity
73.00 %
8
Not Available
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
Hg
Tc
Isotopes
Known Isotopes
34
5
18
21
Electronegativity
Pauling Electronegativity
2.00
7
1.90
11
Sanderson Electronegativity
2.20
7
Not Available
Allred Rochow Electronegativity
1.44
17
1.36
20
Mulliken-Jaffe Electronegativity
1.81
9
Not Available
Allen Electronegativity
1.44
30
1.51
28
Electropositivity
Pauling Electropositivity
2.00
99+
2.10
99+
Ionization Energies
1st Energy Level
1,007.10 kJ/mol
4
702.00 kJ/mol
36
2nd Energy Level
1,810.00 kJ/mol
20
1,470.00 kJ/mol
99+
3rd Energy Level
3,300.00 kJ/mol
20
2,850.00 kJ/mol
33
Electrochemical Equivalent
3.74 g/amp-hr
10
0.52 g/amp-hr
99+
Electron Work Function
4.49 eV
15
Not Available
Other Chemical Properties
Flammability, Ionization, Solubility
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
80
36
43
99+
Electron Configuration
[Xe] 4f14 5d10 6s2
[Kr] 4d5 5s2
Crystal Structure
Rhombohedral (RHO)
Hexagonal Close Packed (HCP)
Crystal Lattice
RHO-Crystal-Structure-of-Mercury.jpg#100
HCP-Crystal-Structure-of-Technetium.jpg#100
Atom
Number of Protons
80
36
43
99+
Number of Neutrons
121
22
55
99+
Number of Electrons
80
36
43
99+
Radius of an Atom
Atomic Radius
151.00 pm
32
136.00 pm
99+
Covalent Radius
132.00 pm
99+
147.00 pm
37
Van der Waals Radius
155.00 pm
99+
200.00 pm
28
Atomic Weight
200.59 amu
32
98.00 amu
99+
Atomic Volume
14.82 cm3/mol
35
8.50 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
28.20 (-eV)
99+
180.00 (-eV)
3
Lattice Constant
300.50 pm
99+
273.50 pm
99+
Lattice Angles
NA
π/2, π/2, 2 π/3
Lattice C/A Ratio
Not Available
1.60
5
Mechanical Properties
Density
Density At Room Temperature
13.53 g/cm3
24
11.00 g/cm3
34
Tensile Strength
Not Available
Not Available
Viscosity
0.00
1
Not Available
Vapor Pressure
Elasticity properties
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
13.53
16
11.50
24
Magnetic Ordering
Diamagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
961.00 nΩ·m
1
200.00 nΩ·m
18
Electrical Conductivity
0.01 106/cm Ω
99+
0.07 106/cm Ω
30
Electron Affinity
0.00 kJ/mol
40
53.00 kJ/mol
18
Thermal Properties
Specific Heat
0.14 J/(kg K)
38
0.21 J/(kg K)
29
Molar Heat Capacity
27.98 J/mol·K
13
24.27 J/mol·K
99+
Thermal Conductivity
8.30 W/m·K
99+
50.60 W/m·K
30
Critical Temperature
1,750.00 K
6
Not Available
Thermal Expansion
60.40 µm/(m·K)
5
7.10 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
56.90 kJ/mol
99+
660.00 kJ/mol
6
Enthalpy of Fusion
2.29 kJ/mol
99+
23.01 kJ/mol
9
Enthalpy of Atomization
61.50 kJ/mol
99+
649.00 kJ/mol
8
Standard Molar Entropy
75.80 J/mol.K
6
181.10 J/mol.K
2
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