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Technetium vs Chromium

Technetium
Chromium
Chromium vs Technetium


Periodic Table
Symbol
Tc   
Cr   
Group Number
7   
11
6   
12
Period Number
5   
4   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440268   
99+
7440473   
39
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.
  
  • Chromium is highly reactive, hence it is not found free in nature.
  • Ores of Chromites mineral are the major source of Chromium metal.
  • Almost 90% leather tanning is done with the help of chromium.
  
Sources
Made by Bombarding Molybdenum with Deuterons   
Found in Minerals, Mining, Ores of metals, Ores of Minerals   
History
  
  
Who Discovered
Emilio Segrè and Carlo Perriero   
Louis Nicolas Vauquelin   
Discovery
In 1937   
In Between 1797 - 1798   
Abundance
  
  
Abundance In Universe
Not Available   
1.5 * 10-3 %   
7
Abundance In Sun
~-9999 %   
~0.002 %   
7
Abundance In Meteorites
Not Available   
0.30 %   
7
Abundance In Earth's Crust
Not Available   
0.01 %   
13
Abundance In Oceans
Not Available   
0.00 %   
16
Abundance In Humans
Not Available   
0.00 %   
16
Uses
Uses & Benefits
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
  • It is used to harden the steel and produces a stainless steel and other various alloys.
  • It is also used to give proper finish to polished mirrors. Its chromium plates are used in bathroom fittings.
  
Industrial Uses
NA   
Automobile Industry, Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Low Toxic   
Highly Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
0.11 Blood/mg dm-3   
12
In Bone
0.00 p.p.m.   
36
0.33 p.p.m.   
21
Physical Properties
Melting Point
2,200.00 °C   
9
1,857.00 °C   
14
Boiling Point
4,877.00 °C   
7
2,672.00 °C   
39
Appearance
  
  
Physical State
Solid   
Solid   
Color
Shiny Gray   
Silver   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
8.50   
1
Brinell Hardness
Not Available   
687.00 MPa   
16
Vickers Hardness
Not Available   
1,060.00 MPa   
10
Speed of Sound
16,200.00 m/s   
1
5,940.00 m/s   
5
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   
Cr   
Isotopes
  
  
Known Isotopes
18   
21
21   
18
Electronegativity
  
  
Pauling Electronegativity
1.90   
11
1.66   
18
Sanderson Electronegativity
Not Available   
1.66   
14
Allred Rochow Electronegativity
1.36   
20
1.56   
10
Allen Electronegativity
1.51   
28
1.65   
19
Electropositivity
  
  
Pauling Electropositivity
2.10   
99+
2.34   
36
Ionization Energies
  
  
1st Energy Level
702.00 kJ/mol   
36
26,130.00 kJ/mol   
1
2nd Energy Level
1,470.00 kJ/mol   
99+
28,750.00 kJ/mol   
1
3rd Energy Level
2,850.00 kJ/mol   
33
34,230.00 kJ/mol   
1
4th Energy Level
Not Available   
37,066.00 kJ/mol   
1
5th Energy Level
Not Available   
97,510.00 kJ/mol   
1
6th Energy Level
Not Available   
105,800.00 kJ/mol   
1
7th Energy level
Not Available   
114,300.00 kJ/mol   
1
8th Energy Level
Not Available   
125,300.00 kJ/mol   
1
9th Energy Level
Not Available   
134,700.00 kJ/mol   
1
10th Energy Level
Not Available   
144,300.00 kJ/mol   
1
11th Energy Level
Not Available   
26,130.00 kJ/mol   
12
12th Energy Level
Not Available   
28,750.00 kJ/mol   
13
13th Energy Level
Not Available   
34,230.00 kJ/mol   
10
14th Energy Level
Not Available   
37,066.00 kJ/mol   
12
15th Energy Level
Not Available   
97,510.00 kJ/mol   
1
16th Energy Level
Not Available   
105,800.00 kJ/mol   
2
17th Energy Level
Not Available   
114,300.00 kJ/mol   
3
18th Energy Level
Not Available   
125,300.00 kJ/mol   
4
19th Energy Level
Not Available   
134,700.00 kJ/mol   
5
20th Energy Level
Not Available   
144,300.00 kJ/mol   
7
21st Energy Level
Not Available   
157,700.00 kJ/mol   
7
22nd Energy Level
Not Available   
166,090.00 kJ/mol   
6
Electrochemical Equivalent
0.52 g/amp-hr   
99+
0.32 g/amp-hr   
99+
Electron Work Function
Not Available   
4.50 eV   
14
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
43   
99+
24   
99+
Electron Configuration
[Kr] 4d5 5s2   
[Ar] 3d5 4s1   
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+
24   
99+
Number of Neutrons
55   
99+
28   
99+
Number of Electrons
43   
99+
24   
99+
Radius of an Atom
  
  
Atomic Radius
136.00 pm   
99+
128.00 pm   
99+
Covalent Radius
147.00 pm   
37
139.00 pm   
99+
Van der Waals Radius
200.00 pm   
28
200.00 pm   
28
Atomic Weight
98.00 amu   
99+
52.00 amu   
99+
Atomic Volume
8.50 cm3/mol   
99+
7.23 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Molybdenum
  
Vanadium
  
Next Element
Ruthenium
  
Manganese
  
Valence Electron Potential
180.00 (-eV)   
3
170.00 (-eV)   
4
Lattice Constant
273.50 pm   
99+
291.00 pm   
99+
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
7.19 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
6.30 g/cm3   
40
Tensile Strength
Not Available   
689.00 MPa   
7
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
24
Vapor Pressure at 2000 K
Not Available   
774.00 (Pa)   
1
Elasticity properties
  
  
Shear Modulus
Not Available   
115.00 GPa   
9
Bulk Modulus
Not Available   
160.00 GPa   
11
Young's Modulus
Not Available   
279.00 GPa   
8
Poisson Ratio
Not Available   
0.21   
32
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
11.50   
24
7.19   
99+
Magnetic Ordering
Paramagnetic   
Antiferromagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
NA   
Resistivity
200.00 nΩ·m   
18
125.00 nΩ·m   
27
Electrical Conductivity
0.07 106/cm Ω   
30
0.08 106/cm Ω   
25
Electron Affinity
53.00 kJ/mol   
18
64.30 kJ/mol   
15
Thermal Properties
Specific Heat
0.21 J/(kg K)   
29
0.45 J/(kg K)   
12
Molar Heat Capacity
24.27 J/mol·K   
99+
23.35 J/mol·K   
99+
Thermal Conductivity
50.60 W/m·K   
30
93.90 W/m·K   
17
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
7.10 µm/(m·K)   
99+
4.90 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
660.00 kJ/mol   
6
348.80 kJ/mol   
24
Enthalpy of Fusion
23.01 kJ/mol   
9
15.31 kJ/mol   
20
Enthalpy of Atomization
649.00 kJ/mol   
8
397.50 kJ/mol   
21
Standard Molar Entropy
181.10 J/mol.K   
2
23.80 J/mol.K   
99+
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