Technetium Mercury Comparison
Periodic Table
Symbol
Tc
Hg
Group Number
7
11
12
6
Period Number
5
6
Block
d block
d block
Element Family
Transition Metal
Transition Metal
CAS Number
7440268
99+
7439976
99+
Space Group Name
P63/mmc
R_ 3m
Space Group Number
194.00
5
166.00
6
Facts
Interesting Facts
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
- 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
Made by Bombarding Molybdenum with Deuterons
Mining, Ores of Minerals
History
Who Discovered
Emilio Segrè and Carlo Perriero
Ancient Chinese and Indians
Discovery
In 1937
Before 2000 BCE
Abundance
Abundance In Earth's Crust
Not Available
0.05 %
9
Uses
Uses & Benefits
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
- 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
Alloys, Nuclear Research, Research Purposes
Alloys, Mirror Manufacturing, Pharmaceutical Industry
Biological Properties
Toxicity
Low 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
2,200.00 °C
9
Not Available
Boiling Point
4,877.00 °C
7
356.58 °C
99+
Appearance
Physical State
Solid
Liquid
Color
Shiny Gray
Silver
Luster
NA
NA
Hardness
Speed of Sound
16,200.00 m/s
1
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
Tc
Hg
Isotopes
Known Isotopes
18
21
34
5
Electronegativity
Pauling Electronegativity
1.90
11
2.00
7
Sanderson Electronegativity
Not Available
2.20
7
Allred Rochow Electronegativity
1.36
20
1.44
17
Mulliken-Jaffe Electronegativity
Not Available
1.81
9
Allen Electronegativity
1.51
28
1.44
30
Electropositivity
Pauling Electropositivity
2.10
99+
2.00
99+
Ionization Energies
1st Energy Level
702.00 kJ/mol
36
1,007.10 kJ/mol
4
2nd Energy Level
1,470.00 kJ/mol
99+
1,810.00 kJ/mol
20
3rd Energy Level
2,850.00 kJ/mol
33
3,300.00 kJ/mol
20
Electrochemical Equivalent
0.52 g/amp-hr
99+
3.74 g/amp-hr
10
Electron Work Function
Not Available
4.49 eV
15
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Flammability, Ionization, Solubility
Atomic Properties
Atomic Number
43
99+
80
36
Electron Configuration
[Kr] 4d5 5s2
[Xe] 4f14 5d10 6s2
Crystal Structure
Hexagonal Close Packed (HCP)
Rhombohedral (RHO)
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100
RHO-Crystal-Structure-of-Mercury.jpg#100
Atom
Number of Protons
43
99+
80
36
Number of Neutrons
55
99+
121
22
Number of Electrons
43
99+
80
36
Radius of an Atom
Atomic Radius
136.00 pm
99+
151.00 pm
32
Covalent Radius
147.00 pm
37
132.00 pm
99+
Van der Waals Radius
200.00 pm
28
155.00 pm
99+
Atomic Weight
98.00 amu
99+
200.59 amu
32
Atomic Volume
8.50 cm3/mol
99+
14.82 cm3/mol
35
Adjacent Atomic Numbers
Valence Electron Potential
180.00 (-eV)
3
28.20 (-eV)
99+
Lattice Constant
273.50 pm
99+
300.50 pm
99+
Lattice Angles
π/2, π/2, 2 π/3
NA
Lattice C/A Ratio
1.60
5
Not Available
Mechanical Properties
Density
Density At Room Temperature
11.00 g/cm3
34
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
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
11.50
24
13.53
16
Magnetic Ordering
Paramagnetic
Diamagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
200.00 nΩ·m
18
961.00 nΩ·m
1
Electrical Conductivity
0.07 106/cm Ω
30
0.01 106/cm Ω
99+
Electron Affinity
53.00 kJ/mol
18
0.00 kJ/mol
40
Thermal Properties
Specific Heat
0.21 J/(kg K)
29
0.14 J/(kg K)
38
Molar Heat Capacity
24.27 J/mol·K
99+
27.98 J/mol·K
13
Thermal Conductivity
50.60 W/m·K
30
8.30 W/m·K
99+
Critical Temperature
Not Available
1,750.00 K
6
Thermal Expansion
7.10 µm/(m·K)
99+
60.40 µm/(m·K)
5
Enthalpy
Enthalpy of Vaporization
660.00 kJ/mol
6
56.90 kJ/mol
99+
Enthalpy of Fusion
23.01 kJ/mol
9
2.29 kJ/mol
99+
Enthalpy of Atomization
649.00 kJ/mol
8
61.50 kJ/mol
99+
Standard Molar Entropy
181.10 J/mol.K
2
75.80 J/mol.K
6
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