Technetium Silver Comparison
Periodic Table
Symbol
Tc
Ag
Group Number
7
11
11
7
Period Number
5
5
Block
d block
d block
Element Family
Transition Metal
Transition Metal
CAS Number
7440268
99+
7440224
99+
Space Group Name
P63/mmc
Fm_ 3m
Space Group Number
194.00
5
225.00
2
Facts
Interesting Facts
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
- It is the most reflective element.
- Silver is the second most ductile metal after Gold.
- It is also used in Dentistry as a dental alloys for clips and crowning.
Sources
Made by Bombarding Molybdenum with Deuterons
Earth's crust, Found in Minerals, Ores of metals
History
Who Discovered
Emilio Segrè and Carlo Perriero
Unknown
Discovery
In 1937
Before 5000 BC
Abundance
Abundance In Universe
Not Available
6 * 10-8 %
26
Abundance In Sun
~-9999 %
~0.0000001 %
26
Abundance In Meteorites
Not Available
0.00 %
38
Abundance In Earth's Crust
Not Available
0.00 %
99+
Abundance In Oceans
Not Available
0.00 %
19
Uses
Uses & Benefits
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
- Silver is mainly used for Jewelry and show piece.
- It is used for manufacturing high quality mirrors due to its reflectivity property.
Industrial Uses
NA
Chemical Industry, Clothing Industry, Electrical Industry
Medical Uses
NA
Dentistry, Pharmaceutical Industry
Other Uses
Alloys, Nuclear Research, Research Purposes
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues
Biological Properties
Toxicity
Low Toxic
Non Toxic
Present in Human Body
No
Yes
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
29
In Bone
0.00 p.p.m.
36
0.44 p.p.m.
20
Physical Properties
Melting Point
2,200.00 °C
9
961.93 °C
99+
Boiling Point
4,877.00 °C
7
2,212.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Shiny Gray
Silvery White
Luster
NA
Metallic
Hardness
Mohs Hardness
Not Available
2.50
14
Brinell Hardness
Not Available
251.00 MPa
37
Vickers Hardness
Not Available
229.00 MPa
30
Speed of Sound
16,200.00 m/s
1
2,680.00 m/s
34
Optical Properties
Reflectivity
Not Available
97.00 %
1
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
Ag
Isotopes
Known Isotopes
18
21
36
3
Electronegativity
Pauling Electronegativity
1.90
11
1.93
9
Sanderson Electronegativity
Not Available
1.83
11
Allred Rochow Electronegativity
1.36
20
1.42
18
Mulliken-Jaffe Electronegativity
Not Available
1.47
15
Allen Electronegativity
1.51
28
1.87
7
Electropositivity
Pauling Electropositivity
2.10
99+
2.07
99+
Ionization Energies
1st Energy Level
702.00 kJ/mol
36
731.00 kJ/mol
27
2nd Energy Level
1,470.00 kJ/mol
99+
2,070.00 kJ/mol
11
3rd Energy Level
2,850.00 kJ/mol
33
3,361.00 kJ/mol
19
Electrochemical Equivalent
0.52 g/amp-hr
99+
4.02 g/amp-hr
7
Electron Work Function
Not Available
4.26 eV
20
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Chemical Stability, Ionization, Solubility
Atomic Properties
Atomic Number
43
99+
47
99+
Electron Configuration
[Kr] 4d5 5s2
[Kr] 4d10 5s1
Crystal Structure
Hexagonal Close Packed (HCP)
Face Centered Cubic (FCC)
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100
FCC-Crystal-Structure-of-Silver.jpg#100
Atom
Number of Protons
43
99+
47
99+
Number of Neutrons
55
99+
61
99+
Number of Electrons
43
99+
47
99+
Radius of an Atom
Atomic Radius
136.00 pm
99+
144.00 pm
36
Covalent Radius
147.00 pm
37
145.00 pm
39
Van der Waals Radius
200.00 pm
28
172.00 pm
38
Atomic Weight
98.00 amu
99+
107.87 amu
99+
Atomic Volume
8.50 cm3/mol
99+
10.30 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
180.00 (-eV)
3
11.40 (-eV)
99+
Lattice Constant
273.50 pm
99+
408.53 pm
20
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
10.49 g/cm3
35
Density When Liquid (at m.p.)
Not Available
9.32 g/cm3
21
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
Not Available
0.00 (Pa)
14
Elasticity properties
Shear Modulus
Not Available
30.00 GPa
23
Bulk Modulus
Not Available
100.00 GPa
16
Young's Modulus
Not Available
83.00 GPa
23
Poisson Ratio
Not Available
0.37
7
Other Mechanical Properties
NA
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
11.50
24
10.50
26
Magnetic Ordering
Paramagnetic
Diamagnetic
Susceptibility
Not Available
0.00
5
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
200.00 nΩ·m
18
15.87 nΩ·m
99+
Electrical Conductivity
0.07 106/cm Ω
30
0.63 106/cm Ω
1
Electron Affinity
53.00 kJ/mol
18
125.60 kJ/mol
5
Thermal Properties
Specific Heat
0.21 J/(kg K)
29
0.24 J/(kg K)
25
Molar Heat Capacity
24.27 J/mol·K
99+
25.35 J/mol·K
99+
Thermal Conductivity
50.60 W/m·K
30
429.00 W/m·K
1
Critical Temperature
Not Available
Not Available
Thermal Expansion
7.10 µm/(m·K)
99+
18.90 µm/(m·K)
23
Enthalpy
Enthalpy of Vaporization
660.00 kJ/mol
6
255.10 kJ/mol
37
Enthalpy of Fusion
23.01 kJ/mol
9
11.30 kJ/mol
31
Enthalpy of Atomization
649.00 kJ/mol
8
284.50 kJ/mol
37
Standard Molar Entropy
181.10 J/mol.K
2
42.60 J/mol.K
35
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