Technetium Cesium Comparison
Periodic Table
Symbol
Tc
Cs
Group Number
7
11
1
17
Period Number
5
6
Block
d block
s block
Element Family
Transition Metal
Alkali
CAS Number
7440268
99+
7440462
40
Space Group Name
P63/mmc
Im_ 3m
Space Group Number
194.00
5
229.00
1
Facts
Interesting Facts
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
Not Available
Sources
Made by Bombarding Molybdenum with Deuterons
Earth's crust, Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Emilio Segrè and Carlo Perriero
Robert Bunsen and Gustav Kirchhoff
Discovery
In 1937
In 1860
Abundance
Abundance In Universe
Not Available
8 * 10-8 %
24
Abundance In Sun
~-9999 %
~0.0000008 %
20
Abundance In Meteorites
Not Available
0.00 %
38
Abundance In Earth's Crust
Not Available
0.00 %
35
Abundance In Oceans
Not Available
0.00 %
17
Abundance In Humans
Not Available
0.00 %
17
Uses
Uses & Benefits
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
- The most common use of cesium metal is as a drilling fluid. It is also used in optical glass manufacturing.
- In vacuum tubes and radiation monitor equipment this metal is used as a catalyst promoter.
Industrial Uses
NA
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
NA
Other Uses
Alloys, Nuclear Research, Research Purposes
Alloys
Biological Properties
Toxicity
Low Toxic
Mildly Toxic
Present in Human Body
No
Yes
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
28
In Bone
0.00 p.p.m.
36
0.05 p.p.m.
26
Physical Properties
Melting Point
2,200.00 °C
9
28.50 °C
99+
Boiling Point
4,877.00 °C
7
678.40 °C
99+
Appearance
Physical State
Solid
Solid
Color
Shiny Gray
Silvery Gold
Luster
NA
NA
Hardness
Mohs Hardness
Not Available
0.20
25
Brinell Hardness
Not Available
0.14 MPa
99+
Speed of Sound
16,200.00 m/s
1
Not Available
Optical Properties
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
Cs
Isotopes
Known Isotopes
18
21
36
3
Electronegativity
Pauling Electronegativity
1.90
11
0.79
99+
Sanderson Electronegativity
Not Available
0.22
33
Allred Rochow Electronegativity
1.36
20
0.86
99+
Mulliken-Jaffe Electronegativity
Not Available
0.62
26
Allen Electronegativity
1.51
28
0.66
99+
Electropositivity
Pauling Electropositivity
2.10
99+
3.21
2
Ionization Energies
1st Energy Level
702.00 kJ/mol
36
375.70 kJ/mol
99+
2nd Energy Level
1,470.00 kJ/mol
99+
2,234.30 kJ/mol
8
3rd Energy Level
2,850.00 kJ/mol
33
3,400.00 kJ/mol
16
Electrochemical Equivalent
0.52 g/amp-hr
99+
4.96 g/amp-hr
3
Electron Work Function
Not Available
2.14 eV
99+
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility
Atomic Properties
Atomic Number
43
99+
55
99+
Electron Configuration
[Kr] 4d5 5s2
[Xe] 6s1
Crystal Structure
Hexagonal Close Packed (HCP)
Body Centered Cubic (BCC)
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
43
99+
55
99+
Number of Neutrons
55
99+
78
99+
Number of Electrons
43
99+
55
99+
Radius of an Atom
Atomic Radius
136.00 pm
99+
265.00 pm
1
Covalent Radius
147.00 pm
37
244.00 pm
2
Van der Waals Radius
200.00 pm
28
343.00 pm
2
Atomic Weight
98.00 amu
99+
132.91 amu
99+
Atomic Volume
8.50 cm3/mol
99+
71.07 cm3/mol
1
Adjacent Atomic Numbers
Valence Electron Potential
180.00 (-eV)
3
8.62 (-eV)
99+
Lattice Constant
273.50 pm
99+
614.10 pm
5
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
1.60
5
Not Available
Mechanical Properties
Density
Density At Room Temperature
11.00 g/cm3
34
1.93 g/cm3
99+
Density When Liquid (at m.p.)
Not Available
1.84 g/cm3
99+
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Bulk Modulus
Not Available
1.60 GPa
99+
Young's Modulus
Not Available
1.70 GPa
99+
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
11.50
24
1.87
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Semiconductor
Resistivity
200.00 nΩ·m
18
205.00 nΩ·m
17
Electrical Conductivity
0.07 106/cm Ω
30
0.05 106/cm Ω
35
Electron Affinity
53.00 kJ/mol
18
45.50 kJ/mol
25
Thermal Properties
Specific Heat
0.21 J/(kg K)
29
0.24 J/(kg K)
23
Molar Heat Capacity
24.27 J/mol·K
99+
32.21 J/mol·K
4
Thermal Conductivity
50.60 W/m·K
30
35.90 W/m·K
36
Critical Temperature
Not Available
1,938.00 K
5
Thermal Expansion
7.10 µm/(m·K)
99+
97.00 µm/(m·K)
1
Enthalpy
Enthalpy of Vaporization
660.00 kJ/mol
6
65.90 kJ/mol
99+
Enthalpy of Fusion
23.01 kJ/mol
9
2.10 kJ/mol
99+
Enthalpy of Atomization
649.00 kJ/mol
8
78.20 kJ/mol
99+
Standard Molar Entropy
181.10 J/mol.K
2
85.20 J/mol.K
3
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