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Actinium Technetium Comparison

Actinium
Technetium
Technetium Actinium comparison


Periodic Table
Symbol
Ac  
Tc  
Group Number
3  
15
7  
11
Period Number
7  
5  
Block
f block  
d block  
Element Family
Actinide  
Transition Metal  
CAS Number
7440348  
99+
7440268  
99+
Space Group Name
Fm_ 3m  
P63/mmc  
Space Group Number
225.00  
3
194.00  
7
Facts
Interesting Facts
Actinium glows in the dark due to its radioactivity.  
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
Sources
Obtained by Treating Radium with Neutrons, Ores of metals  
Made by Bombarding Molybdenum with Deuterons  
History
  
  
Who Discovered
Friedrich Oskar Giesel  
Emilio Segrè and Carlo Perriero  
Discovery
In 1902  
In 1937  
Abundance
  
  
Abundance In Universe
0.00 %  
34
0.00 %  
40
Abundance In Sun
0.00 %  
26
0.00 %  
18
Abundance In Meteorites
0.00 %  
99+
-  
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
24
-  
Uses
Uses & Benefits
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
  • 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  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
Toxic  
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
1,227.00 °C  
38
2,200.00 °C  
9
Boiling Point
3,200.00 °C  
27
4,877.00 °C  
7
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Shiny Gray  
Luster
-  
-  
Hardness
  
  
Mohs Hardness
6.50  
5
2.25  
16
Brinell Hardness
70.00 MPa  
99+
550.00 MPa  
27
Vickers Hardness
260.00 MPa  
99+
500.00 MPa  
35
Speed of Sound
3,430.00 m/s  
32
16,200.00 m/s  
1
Optical Properties
  
  
Refractive Index
1.00  
99+
1.90  
18
Reflectivity
62.00 %  
21
35.00 %  
34
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ac  
Tc  
Isotopes
  
  
Known Isotopes
29  
10
18  
21
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
1.90  
12
Sanderson Electronegativity
1.10  
38
1.90  
13
Allred Rochow Electronegativity
1.00  
37
1.36  
21
Mulliken-Jaffe Electronegativity
1.10  
99+
1.90  
13
Allen Electronegativity
1.10  
99+
1.51  
31
Electropositivity
  
  
Pauling Electropositivity
2.90  
10
2.10  
99+
Ionization Energies
  
  
1st Energy Level
499.00 kJ/mol  
99+
702.00 kJ/mol  
36
2nd Energy Level
1,170.00 kJ/mol  
99+
1,470.00 kJ/mol  
99+
3rd Energy Level
1,900.00 kJ/mol  
99+
2,850.00 kJ/mol  
34
4th Energy Level
4,700.00 kJ/mol  
33
7,020.00 kJ/mol  
14
5th Energy Level
4,990.00 kJ/mol  
99+
7,020.00 kJ/mol  
28
6th Energy Level
5,750.00 kJ/mol  
99+
7,020.00 kJ/mol  
99+
7th Energy level
5,750.00 kJ/mol  
99+
4,700.00 kJ/mol  
99+
8th Energy Level
5,750.00 kJ/mol  
99+
4,700.00 kJ/mol  
99+
9th Energy Level
4,990.00 kJ/mol  
99+
7,020.00 kJ/mol  
35
10th Energy Level
4,990.00 kJ/mol  
99+
7,020.00 kJ/mol  
39
11th Energy Level
4,990.00 kJ/mol  
99+
7,020.00 kJ/mol  
37
12th Energy Level
49,900.00 kJ/mol  
21
7,020.00 kJ/mol  
99+
13th Energy Level
4,990.00 kJ/mol  
99+
7,020.00 kJ/mol  
33
14th Energy Level
4,990.00 kJ/mol  
99+
7,020.00 kJ/mol  
23
15th Energy Level
49,900.00 kJ/mol  
99+
70,200.00 kJ/mol  
29
16th Energy Level
49,900.00 kJ/mol  
99+
70,200.00 kJ/mol  
24
17th Energy Level
499.00 kJ/mol  
99+
702.50 kJ/mol  
99+
18th Energy Level
4,990.00 kJ/mol  
99+
7,020.00 kJ/mol  
35
19th Energy Level
499.00 kJ/mol  
99+
702.00 kJ/mol  
99+
20th Energy Level
499.00 kJ/mol  
99+
702.00 kJ/mol  
35
21st Energy Level
4,990.00 kJ/mol  
25
702.00 kJ/mol  
99+
22nd Energy Level
499.00 kJ/mol  
99+
702.00 kJ/mol  
29
23rd Energy Level
4,990.00 kJ/mol  
29
702.00 kJ/mol  
99+
24th Energy Level
499.00 kJ/mol  
99+
702.50 kJ/mol  
28
25th Energy Level
499.00 kJ/mol  
99+
702.00 kJ/mol  
30
26th Energy Level
499.00 kJ/mol  
99+
702.00 kJ/mol  
29
27th Energy Level
499.00 kJ/mol  
99+
702.00 kJ/mol  
30
28th Energy Level
499.00 kJ/mol  
99+
702.00 kJ/mol  
35
29th Energy Level
499.00 kJ/mol  
99+
702.00 kJ/mol  
36
30th Energy Level
499.00 kJ/mol  
99+
702.00 kJ/mol  
30
Electrochemical Equivalent
2.82 g/amp-hr  
22
0.52 g/amp-hr  
99+
Electron Work Function
4.38 eV  
23
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
89  
29
43  
99+
Electron Configuration
[Rn] 6d1 7s2  
[Kr] 4d5 5s2  
Crystal Structure
Face Centered Cubic (FCC)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100  
HCP-Crystal-Structure-of-Technetium.jpg#100  
Atom
  
  
Number of Protons
89  
29
43  
99+
Number of Neutrons
138  
17
55  
99+
Number of Electrons
89  
29
43  
99+
Radius of an Atom
  
  
Atomic Radius
195.00 pm  
9
136.00 pm  
99+
Covalent Radius
186.00 pm  
21
147.00 pm  
39
Van der Waals Radius
215.00 pm  
31
200.00 pm  
35
Atomic Weight
227.00 amu  
25
98.00 amu  
99+
Atomic Volume
22.54 cm3/mol  
20
8.50 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Radium
  
Molybdenum
  
Next Element
Thorium
  
Ruthenium
  
Valence Electron Potential
38.60 (-eV)  
99+
180.00 (-eV)  
3
Lattice Constant
567.00 pm  
9
273.50 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.89  
2
1.60  
21
Mechanical
Density
  
  
Density At Room Temperature
10.00 g/cm3  
40
11.00 g/cm3  
36
Density When Liquid (at m.p.)
10.07 g/cm3  
40
11.00 g/cm3  
34
Tensile Strength
65.00 MPa  
33
50.00 MPa  
38
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
99+
Elasticity properties
  
  
Shear Modulus
25.00 GPa  
38
27.00 GPa  
34
Bulk Modulus
94.00 GPa  
17
100.00 GPa  
16
Young's Modulus
130.00 GPa  
16
50.00 GPa  
39
Poisson Ratio
0.34  
10
0.38  
6
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
10.07  
99+
11.50  
37
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
5.20 nΩ·m  
99+
200.00 nΩ·m  
18
Electrical Conductivity
0.15 106/cm Ω  
13
0.07 106/cm Ω  
35
Electron Affinity
33.20 kJ/mol  
34
53.00 kJ/mol  
23
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.21 J/(kg K)  
30
Molar Heat Capacity
27.20 J/mol·K  
24
24.27 J/mol·K  
99+
Thermal Conductivity
12.00 W/m·K  
99+
50.60 W/m·K  
30
Critical Temperature
1,323.00 K  
99+
2,150.00 K  
16
Thermal Expansion
12.10 µm/(m·K)  
99+
7.10 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
120.00 kJ/mol  
99+
660.00 kJ/mol  
7
Enthalpy of Fusion
14.20 kJ/mol  
28
23.01 kJ/mol  
9
Enthalpy of Atomization
301.00 kJ/mol  
99+
649.00 kJ/mol  
9
Standard Molar Entropy
56.50 J/mol.K  
33
181.10 J/mol.K  
2
Summary >>
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