Technetium vs Magnesium
Periodic Table
Symbol
Tc
Mg
Group Number
7
11
2
16
Period Number
5
3
Block
d block
s block
Element Family
Transition Metal
Alkaline Earth
CAS Number
7440268
99+
7439954
99+
Space Group Name
P63/mmc
P63/mmc
Space Group Number
194.00
5
194.00
5
Facts
Interesting Facts
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
- Magnesium ions are present in every chlorophyll of every green plant .
- Controlling Magnesium fire by pouring water on it will result in explosions.
Sources
Made by Bombarding Molybdenum with Deuterons
By Electrolysis Process, In Ocean, Mining
History
Who Discovered
Emilio Segrè and Carlo Perriero
Joseph Black
Discovery
In 1937
In 1755
Abundance
Abundance In Universe
Not Available
6 * 10-2 %
2
Abundance In Sun
~-9999 %
~0.07 %
2
Abundance In Meteorites
Not Available
12.00 %
2
Abundance In Earth's Crust
Not Available
2.90 %
4
Abundance In Oceans
Not Available
0.13 %
2
Abundance In Humans
Not Available
0.03 %
4
Uses
Uses & Benefits
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
- Magnesium aluminum alloy improves the mechanical strength and welding characteristics and hence it is used in aeroplane and car manufacturing.
- It is also used to remove sulfur from the molten iron and steel.
Industrial Uses
NA
Aerospace Industry, Ammunition Industry, Automobile Industry, Chemical Industry, Pharmaceutical Industry
Medical Uses
NA
NA
Other Uses
Alloys, Nuclear Research, Research Purposes
Surgical Instruments Manufacturing
Biological Properties
Toxicity
Low Toxic
Non Toxic
Present in Human Body
No
Yes
In Blood
0.00 Blood/mg dm-3
37
37.80 Blood/mg dm-3
5
In Bone
0.00 p.p.m.
36
1,800.00 p.p.m.
4
Physical Properties
Melting Point
2,200.00 °C
9
650.00 °C
99+
Boiling Point
4,877.00 °C
7
1,107.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Shiny Gray
Gray
Luster
NA
NA
Hardness
Mohs Hardness
Not Available
2.50
14
Brinell Hardness
Not Available
260.00 MPa
36
Speed of Sound
16,200.00 m/s
1
4,940.00 m/s
11
Optical Properties
Reflectivity
Not Available
74.00 %
7
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
Mg
Isotopes
Known Isotopes
18
21
15
24
Electronegativity
Pauling Electronegativity
1.90
11
1.31
31
Sanderson Electronegativity
Not Available
1.32
18
Allred Rochow Electronegativity
1.36
20
1.23
25
Mulliken-Jaffe Electronegativity
Not Available
1.37
16
Allen Electronegativity
1.51
28
1.29
35
Electropositivity
Pauling Electropositivity
2.10
99+
2.69
23
Ionization Energies
1st Energy Level
702.00 kJ/mol
36
737.70 kJ/mol
24
2nd Energy Level
1,470.00 kJ/mol
99+
1,450.70 kJ/mol
99+
3rd Energy Level
2,850.00 kJ/mol
33
7,732.70 kJ/mol
5
4th Energy Level
Not Available
10,542.50 kJ/mol
4
5th Energy Level
Not Available
13,630.00 kJ/mol
3
6th Energy Level
Not Available
18,020.00 kJ/mol
3
7th Energy level
Not Available
21,711.00 kJ/mol
3
8th Energy Level
Not Available
25,661.00 kJ/mol
3
9th Energy Level
Not Available
31,653.00 kJ/mol
3
10th Energy Level
Not Available
35,458.00 kJ/mol
5
11th Energy Level
Not Available
169,988.00 kJ/mol
1
12th Energy Level
Not Available
189,368.00 kJ/mol
1
Electrochemical Equivalent
0.52 g/amp-hr
99+
0.45 g/amp-hr
99+
Electron Work Function
Not Available
3.66 eV
29
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Corrosion, Highly Inflammable, Ionization, Solubility
Atomic Properties
Atomic Number
43
99+
12
99+
Electron Configuration
[Kr] 4d5 5s2
[Ne] 3s2
Crystal Structure
Hexagonal Close Packed (HCP)
Hexagonal Close Packed (HCP)
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100
HCP-Crystal-Structure-of-Magnesium.jpg#100
Atom
Number of Protons
43
99+
12
99+
Number of Neutrons
55
99+
12
99+
Number of Electrons
43
99+
12
99+
Radius of an Atom
Atomic Radius
136.00 pm
99+
160.00 pm
27
Covalent Radius
147.00 pm
37
141.00 pm
99+
Van der Waals Radius
200.00 pm
28
173.00 pm
37
Atomic Weight
98.00 amu
99+
24.31 amu
99+
Atomic Volume
8.50 cm3/mol
99+
13.97 cm3/mol
37
Adjacent Atomic Numbers
Valence Electron Potential
180.00 (-eV)
3
40.00 (-eV)
99+
Lattice Constant
273.50 pm
99+
320.94 pm
99+
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, 2 π/3
Lattice C/A Ratio
1.60
5
Not Available
Mechanical Properties
Density
Density At Room Temperature
11.00 g/cm3
34
1.74 g/cm3
99+
Density When Liquid (at m.p.)
Not Available
1.58 g/cm3
99+
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Shear Modulus
Not Available
17.00 GPa
37
Bulk Modulus
Not Available
45.00 GPa
25
Young's Modulus
Not Available
45.00 GPa
39
Poisson Ratio
Not Available
0.29
15
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
11.50
24
1.74
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
200.00 nΩ·m
18
43.90 nΩ·m
99+
Electrical Conductivity
0.07 106/cm Ω
30
0.23 106/cm Ω
7
Electron Affinity
53.00 kJ/mol
18
0.00 kJ/mol
40
Thermal Properties
Specific Heat
0.21 J/(kg K)
29
1.02 J/(kg K)
4
Molar Heat Capacity
24.27 J/mol·K
99+
24.87 J/mol·K
99+
Thermal Conductivity
50.60 W/m·K
30
156.00 W/m·K
8
Critical Temperature
Not Available
Not Available
Thermal Expansion
7.10 µm/(m·K)
99+
24.80 µm/(m·K)
15
Enthalpy
Enthalpy of Vaporization
660.00 kJ/mol
6
128.70 kJ/mol
99+
Enthalpy of Fusion
23.01 kJ/mol
9
8.95 kJ/mol
39
Enthalpy of Atomization
649.00 kJ/mol
8
148.50 kJ/mol
99+
Standard Molar Entropy
181.10 J/mol.K
2
32.70 J/mol.K
99+
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