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