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Lawrencium vs Technetium

Lawrencium
Technetium
Technetium vs Lawrencium


Periodic Table
Symbol
Lr  
Tc  
Group Number
3  
15
7  
11
Period Number
7  
5  
Block
d block  
d block  
Element Family
Actinide  
Transition Metal  
CAS Number
22537195  
15
7440268  
99+
Space Group Name
-  
P63/mmc  
Space Group Number
225.00  
3
194.00  
7
Facts
Interesting Facts
  • It is synthetically produced metal.
  • Radiation hazard can be produce by it.
  
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
Sources
Bombarding Californium-252 with Boron Nuclei, Found in Minerals, Mining  
Made by Bombarding Molybdenum with Deuterons  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory and Joint Institute for Nuclear Research  
Emilio Segrè and Carlo Perriero  
Discovery
In 1961–1971  
In 1937  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
40
Abundance In Sun
-  
0.00 %  
18
Abundance In Meteorites
0.00 %  
99+
-  
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
-  
-  
Uses
Uses & Benefits
  • Currently known uses of Lawrencium metal are limited to research purpose only.
  
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
-  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
-  
Low Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,627.00 °C  
20
2,200.00 °C  
9
Boiling Point
0.00 °C  
99+
4,877.00 °C  
7
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Shiny Gray  
Luster
Unknown Luster  
-  
Hardness
  
  
Mohs Hardness
-  
2.25  
16
Brinell Hardness
500.00 MPa  
28
550.00 MPa  
27
Vickers Hardness
500.00 MPa  
35
500.00 MPa  
35
Speed of Sound
2,760.00 m/s  
99+
16,200.00 m/s  
1
Optical Properties
  
  
Refractive Index
1.30  
99+
1.90  
18
Reflectivity
65.00 %  
18
35.00 %  
34
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Lr  
Tc  
Isotopes
  
  
Known Isotopes
10  
28
18  
21
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.90  
12
Sanderson Electronegativity
1.30  
25
1.90  
13
Allred Rochow Electronegativity
1.30  
25
1.36  
21
Mulliken-Jaffe Electronegativity
1.30  
33
1.90  
13
Allen Electronegativity
1.30  
40
1.51  
31
Electropositivity
  
  
Pauling Electropositivity
2.00  
99+
2.10  
99+
Ionization Energies
  
  
1st Energy Level
470.00 kJ/mol  
99+
702.00 kJ/mol  
36
2nd Energy Level
1,428.00 kJ/mol  
99+
1,470.00 kJ/mol  
99+
3rd Energy Level
2,228.00 kJ/mol  
99+
2,850.00 kJ/mol  
34
4th Energy Level
4,910.00 kJ/mol  
31
7,020.00 kJ/mol  
14
5th Energy Level
4,780.00 kJ/mol  
99+
7,020.00 kJ/mol  
28
6th Energy Level
4,780.00 kJ/mol  
99+
7,020.00 kJ/mol  
99+
7th Energy level
4,780.00 kJ/mol  
99+
4,700.00 kJ/mol  
99+
8th Energy Level
4,780.00 kJ/mol  
99+
4,700.00 kJ/mol  
99+
9th Energy Level
4,780.00 kJ/mol  
99+
7,020.00 kJ/mol  
35
10th Energy Level
5,800.00 kJ/mol  
99+
7,020.00 kJ/mol  
39
11th Energy Level
5,800.00 kJ/mol  
99+
7,020.00 kJ/mol  
37
12th Energy Level
47,800.00 kJ/mol  
22
7,020.00 kJ/mol  
99+
13th Energy Level
4,780.00 kJ/mol  
99+
7,020.00 kJ/mol  
33
14th Energy Level
1,186.00 kJ/mol  
99+
7,020.00 kJ/mol  
23
15th Energy Level
47,800.00 kJ/mol  
99+
70,200.00 kJ/mol  
29
16th Energy Level
470.00 kJ/mol  
99+
70,200.00 kJ/mol  
24
17th Energy Level
1,186.00 kJ/mol  
15
702.50 kJ/mol  
99+
18th Energy Level
4,780.00 kJ/mol  
99+
7,020.00 kJ/mol  
35
19th Energy Level
1,186.00 kJ/mol  
12
702.00 kJ/mol  
99+
20th Energy Level
860.00 kJ/mol  
17
702.00 kJ/mol  
35
21st Energy Level
1,186.00 kJ/mol  
27
702.00 kJ/mol  
99+
22nd Energy Level
388.00 kJ/mol  
99+
702.00 kJ/mol  
29
23rd Energy Level
1,180.00 kJ/mol  
32
702.00 kJ/mol  
99+
24th Energy Level
546.10 kJ/mol  
99+
702.50 kJ/mol  
28
25th Energy Level
0.00 kJ/mol  
99+
702.00 kJ/mol  
30
26th Energy Level
594.70 kJ/mol  
99+
702.00 kJ/mol  
29
27th Energy Level
470.00 kJ/mol  
99+
702.00 kJ/mol  
30
28th Energy Level
478.00 kJ/mol  
99+
702.00 kJ/mol  
35
29th Energy Level
580.00 kJ/mol  
99+
702.00 kJ/mol  
36
30th Energy Level
0.00 kJ/mol  
99+
702.00 kJ/mol  
30
Electrochemical Equivalent
3.23 g/amp-hr  
12
0.52 g/amp-hr  
99+
Electron Work Function
4.90 eV  
12
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes  
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
103  
15
43  
99+
Electron Configuration
[Rn] 5f14 7s2 7p1  
[Kr] 4d5 5s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
HCP-Crystal-Structure-of-Technetium.jpg#100  
Atom
  
  
Number of Protons
103  
15
43  
99+
Number of Neutrons
157  
8
55  
99+
Number of Electrons
103  
15
43  
99+
Radius of an Atom
  
  
Atomic Radius
162.00 pm  
28
136.00 pm  
99+
Covalent Radius
162.00 pm  
31
147.00 pm  
39
Van der Waals Radius
246.00 pm  
12
200.00 pm  
35
Atomic Weight
266.00 amu  
12
98.00 amu  
99+
Atomic Volume
35.10 cm3/mol  
7
8.50 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Nobelium
  
Molybdenum
  
Next Element
Rutherfordium
  
Ruthenium
  
Valence Electron Potential
0.00 (-eV)  
99+
180.00 (-eV)  
3
Lattice Constant
530.00 pm  
14
273.50 pm  
99+
Lattice Angles
-  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.60  
22
1.60  
21
Mechanical
Density
  
  
Density At Room Temperature
15.00 g/cm3  
22
11.00 g/cm3  
36
Density When Liquid (at m.p.)
15.60 g/cm3  
20
11.00 g/cm3  
34
Tensile Strength
80.00 MPa  
29
50.00 MPa  
38
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
37
0.00 (Pa)  
99+
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
27.00 GPa  
34
Bulk Modulus
15.00 GPa  
99+
100.00 GPa  
16
Young's Modulus
210.00 GPa  
10
50.00 GPa  
39
Poisson Ratio
0.32  
12
0.38  
6
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
15.60  
22
11.50  
37
Magnetic Ordering
-  
Paramagnetic  
Permeability
0.00 H/m  
13
0.00 H/m  
17
Susceptibility
0.00  
23
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
8.37 nΩ·m  
99+
200.00 nΩ·m  
18
Electrical Conductivity
0.00 106/cm Ω  
99+
0.07 106/cm Ω  
35
Electron Affinity
50.00 kJ/mol  
26
53.00 kJ/mol  
23
Thermal
Specific Heat
0.22 J/(kg K)  
29
0.21 J/(kg K)  
30
Molar Heat Capacity
27.00 J/mol·K  
29
24.27 J/mol·K  
99+
Thermal Conductivity
0.00 W/m·K  
99+
50.60 W/m·K  
30
Critical Temperature
1,323.00 K  
99+
2,150.00 K  
16
Thermal Expansion
8.50 µm/(m·K)  
99+
7.10 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
341.90 kJ/mol  
37
660.00 kJ/mol  
7
Enthalpy of Fusion
-  
23.01 kJ/mol  
9
Enthalpy of Atomization
580.00 kJ/mol  
14
649.00 kJ/mol  
9
Standard Molar Entropy
54.80 J/mol.K  
35
181.10 J/mol.K  
2
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