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Technetium vs Scandium

Technetium
Scandium
Scandium vs Technetium


Periodic Table
Symbol
Tc  
Sc  
Group Number
7  
11
3  
15
Period Number
5  
4  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440268  
99+
7440202  
99+
Space Group Name
P63/mmc  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
  • Scandium is known as one of the rare earth elements.
  • Scandium metal found in rare minerals called Wolframite .
  
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  
Lars Fredrik Nilson  
Discovery
In 1937  
In 1879  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
16
Abundance In Sun
0.00 %  
18
0.00 %  
16
Abundance In Meteorites
-  
0.00 %  
18
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
23
Abundance In Oceans
-  
0.00 %  
32
Abundance In Humans
-  
0.00 %  
24
Uses
Uses & Benefits
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
  • Uses of Scandium are limited to research purpose only. However, it has very low density and higher melting point.
  • Its compounds like scandium iodide is used in mercury vapor lamps to produce very bright white light.
  
Industrial Uses
-  
Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
Alloys  
Biological Properties
  
  
Toxicity
Low Toxic  
Non Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.01 Blood/mg dm-3  
22
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
39
Physical
Melting Point
2,200.00 °C  
9
1,539.00 °C  
24
Boiling Point
4,877.00 °C  
7
2,832.00 °C  
36
Appearance
  
  
Physical State
Solid  
Solid  
Color
Shiny Gray  
Silvery White  
Luster
-  
Lustrous  
Hardness
  
  
Mohs Hardness
2.25  
16
5.50  
7
Brinell Hardness
550.00 MPa  
27
750.00 MPa  
13
Vickers Hardness
500.00 MPa  
35
1,200.00 MPa  
13
Speed of Sound
16,200.00 m/s  
1
6,100.00 m/s  
5
Optical Properties
  
  
Refractive Index
1.90  
18
1.80  
21
Reflectivity
35.00 %  
34
93.00 %  
3
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Tc  
Sc  
Isotopes
  
  
Known Isotopes
18  
21
13  
26
Electronegativity
  
  
Pauling Electronegativity
1.90  
12
1.36  
30
Sanderson Electronegativity
1.90  
13
1.02  
40
Allred Rochow Electronegativity
1.36  
21
1.20  
28
Mulliken-Jaffe Electronegativity
1.90  
13
1.36  
31
Allen Electronegativity
1.51  
31
1.19  
99+
Electropositivity
  
  
Pauling Electropositivity
2.10  
99+
2.64  
25
Ionization Energies
  
  
1st Energy Level
702.00 kJ/mol  
36
633.10 kJ/mol  
99+
2nd Energy Level
1,470.00 kJ/mol  
99+
1,235.00 kJ/mol  
99+
3rd Energy Level
2,850.00 kJ/mol  
34
2,388.60 kJ/mol  
99+
4th Energy Level
7,020.00 kJ/mol  
14
7,090.60 kJ/mol  
13
5th Energy Level
7,020.00 kJ/mol  
28
8,843.00 kJ/mol  
7
6th Energy Level
7,020.00 kJ/mol  
99+
10,679.00 kJ/mol  
13
7th Energy level
4,700.00 kJ/mol  
99+
13,310.00 kJ/mol  
8
8th Energy Level
4,700.00 kJ/mol  
99+
15,250.00 kJ/mol  
11
9th Energy Level
7,020.00 kJ/mol  
35
17,370.00 kJ/mol  
14
10th Energy Level
7,020.00 kJ/mol  
39
21,726.00 kJ/mol  
13
11th Energy Level
7,020.00 kJ/mol  
37
24,102.00 kJ/mol  
16
12th Energy Level
7,020.00 kJ/mol  
99+
66,320.00 kJ/mol  
7
13th Energy Level
7,020.00 kJ/mol  
33
73,010.00 kJ/mol  
2
14th Energy Level
7,020.00 kJ/mol  
23
80,160.00 kJ/mol  
3
15th Energy Level
70,200.00 kJ/mol  
29
89,490.00 kJ/mol  
6
16th Energy Level
70,200.00 kJ/mol  
24
97,400.00 kJ/mol  
5
17th Energy Level
702.50 kJ/mol  
99+
105,600.00 kJ/mol  
6
18th Energy Level
7,020.00 kJ/mol  
35
117,000.00 kJ/mol  
7
19th Energy Level
702.00 kJ/mol  
99+
124,270.00 kJ/mol  
8
20th Energy Level
702.00 kJ/mol  
35
633.00 kJ/mol  
99+
21st Energy Level
702.00 kJ/mol  
99+
633.10 kJ/mol  
99+
22nd Energy Level
702.00 kJ/mol  
29
633.00 kJ/mol  
35
23rd Energy Level
702.00 kJ/mol  
99+
633.10 kJ/mol  
99+
24th Energy Level
702.50 kJ/mol  
28
633.10 kJ/mol  
37
25th Energy Level
702.00 kJ/mol  
30
633.00 kJ/mol  
39
26th Energy Level
702.00 kJ/mol  
29
633.10 kJ/mol  
38
27th Energy Level
702.00 kJ/mol  
30
633.10 kJ/mol  
40
28th Energy Level
702.00 kJ/mol  
35
633.10 kJ/mol  
99+
29th Energy Level
702.00 kJ/mol  
36
633.10 kJ/mol  
99+
30th Energy Level
702.00 kJ/mol  
30
633.00 kJ/mol  
99+
Electrochemical Equivalent
0.52 g/amp-hr  
99+
0.56 g/amp-hr  
99+
Electron Work Function
4.90 eV  
12
3.50 eV  
99+
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Corrosion, Flammable, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
43  
99+
21  
99+
Electron Configuration
[Kr] 4d5 5s2  
[Ar] 3d1 4s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100  
HCP-Crystal-Structure-of-Scandium.jpg#100  
Atom
  
  
Number of Protons
43  
99+
21  
99+
Number of Neutrons
55  
99+
24  
99+
Number of Electrons
43  
99+
21  
99+
Radius of an Atom
  
  
Atomic Radius
136.00 pm  
99+
162.00 pm  
28
Covalent Radius
147.00 pm  
39
170.00 pm  
27
Van der Waals Radius
200.00 pm  
35
211.00 pm  
32
Atomic Weight
98.00 amu  
99+
44.96 amu  
99+
Atomic Volume
8.50 cm3/mol  
99+
15.00 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Molybdenum
  
Calcium
  
Next Element
Ruthenium
  
Titanium
  
Valence Electron Potential
180.00 (-eV)  
3
58.00 (-eV)  
25
Lattice Constant
273.50 pm  
99+
330.90 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.60  
21
1.59  
24
Mechanical
Density
  
  
Density At Room Temperature
11.00 g/cm3  
36
2.99 g/cm3  
99+
Density When Liquid (at m.p.)
11.00 g/cm3  
34
2.80 g/cm3  
99+
Tensile Strength
50.00 MPa  
38
150.00 MPa  
25
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
24
Vapor Pressure at 2000 K
0.00 (Pa)  
99+
91.30 (Pa)  
3
Elasticity properties
  
  
Shear Modulus
27.00 GPa  
34
29.10 GPa  
28
Bulk Modulus
100.00 GPa  
16
56.60 GPa  
22
Young's Modulus
50.00 GPa  
39
74.40 GPa  
28
Poisson Ratio
0.38  
6
0.28  
18
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
11.50  
37
2.99  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
8
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
200.00 nΩ·m  
18
562.00 nΩ·m  
10
Electrical Conductivity
0.07 106/cm Ω  
35
0.02 106/cm Ω  
99+
Electron Affinity
53.00 kJ/mol  
23
18.10 kJ/mol  
39
Thermal
Specific Heat
0.21 J/(kg K)  
30
0.60 J/(kg K)  
8
Molar Heat Capacity
24.27 J/mol·K  
99+
25.52 J/mol·K  
99+
Thermal Conductivity
50.60 W/m·K  
30
15.80 W/m·K  
99+
Critical Temperature
2,150.00 K  
16
1,814.00 K  
28
Thermal Expansion
7.10 µm/(m·K)  
99+
10.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
660.00 kJ/mol  
7
314.20 kJ/mol  
99+
Enthalpy of Fusion
23.01 kJ/mol  
9
14.10 kJ/mol  
29
Enthalpy of Atomization
649.00 kJ/mol  
9
343.00 kJ/mol  
38
Standard Molar Entropy
181.10 J/mol.K  
2
34.60 J/mol.K  
99+
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