Home
 Compare Metals

Protactinium vs Technetium

Protactinium
Technetium
Technetium vs Protactinium


Periodic Table
Symbol
Pa  
Tc  
Group Number
3  
15
7  
11
Period Number
7  
5  
Block
f block  
d block  
Element Family
Actinide  
Transition Metal  
CAS Number
7440133  
99+
7440268  
99+
Space Group Name
I4/mmm  
P63/mmc  
Space Group Number
139.00  
11
194.00  
7
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
Sources
Found in Uranium Ores, Mining, Ores of metals  
Made by Bombarding Molybdenum with Deuterons  
History
  
  
Who Discovered
William Crookes  
Emilio Segrè and Carlo Perriero  
Discovery
In 1900  
In 1937  
Abundance
  
  
Abundance In Universe
0.00 %  
17
0.00 %  
40
Abundance In Sun
0.00 %  
26
0.00 %  
18
Abundance In Meteorites
-  
-  
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
  • Currently known uses of Protactinium 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
Highly 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
1,568.00 °C  
21
2,200.00 °C  
9
Boiling Point
4,027.00 °C  
12
4,877.00 °C  
7
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Shiny Gray  
Luster
Metallic  
-  
Hardness
  
  
Mohs Hardness
5.00  
8
2.25  
16
Brinell Hardness
125.00 MPa  
99+
550.00 MPa  
27
Vickers Hardness
220.00 MPa  
99+
500.00 MPa  
35
Speed of Sound
12,400.00 m/s  
3
16,200.00 m/s  
1
Optical Properties
  
  
Refractive Index
1.60  
33
1.90  
18
Reflectivity
60.00 %  
23
35.00 %  
34
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Pa  
Tc  
Isotopes
  
  
Known Isotopes
27  
12
18  
21
Electronegativity
  
  
Pauling Electronegativity
1.50  
28
1.90  
12
Sanderson Electronegativity
1.50  
18
1.90  
13
Allred Rochow Electronegativity
1.14  
29
1.36  
21
Mulliken-Jaffe Electronegativity
1.50  
26
1.90  
13
Allen Electronegativity
1.50  
32
1.51  
31
Electropositivity
  
  
Pauling Electropositivity
2.50  
27
2.10  
99+
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol  
99+
702.00 kJ/mol  
36
2nd Energy Level
1,128.00 kJ/mol  
99+
1,470.00 kJ/mol  
99+
3rd Energy Level
1,814.00 kJ/mol  
99+
2,850.00 kJ/mol  
34
4th Energy Level
2,991.00 kJ/mol  
99+
7,020.00 kJ/mol  
14
5th Energy Level
5,120.00 kJ/mol  
99+
7,020.00 kJ/mol  
28
6th Energy Level
5,680.00 kJ/mol  
99+
7,020.00 kJ/mol  
99+
7th Energy level
5,680.00 kJ/mol  
99+
4,700.00 kJ/mol  
99+
8th Energy Level
5,680.00 kJ/mol  
99+
4,700.00 kJ/mol  
99+
9th Energy Level
5,120.00 kJ/mol  
99+
7,020.00 kJ/mol  
35
10th Energy Level
5,120.00 kJ/mol  
99+
7,020.00 kJ/mol  
39
11th Energy Level
5,680.00 kJ/mol  
99+
7,020.00 kJ/mol  
37
12th Energy Level
5,680.00 kJ/mol  
99+
7,020.00 kJ/mol  
99+
13th Energy Level
5,680.00 kJ/mol  
99+
7,020.00 kJ/mol  
33
14th Energy Level
5,680.00 kJ/mol  
99+
7,020.00 kJ/mol  
23
15th Energy Level
56,800.00 kJ/mol  
99+
70,200.00 kJ/mol  
29
16th Energy Level
56,800.00 kJ/mol  
99+
70,200.00 kJ/mol  
24
17th Energy Level
568.50 kJ/mol  
99+
702.50 kJ/mol  
99+
18th Energy Level
5,680.00 kJ/mol  
99+
7,020.00 kJ/mol  
35
19th Energy Level
568.30 kJ/mol  
99+
702.00 kJ/mol  
99+
20th Energy Level
568.00 kJ/mol  
99+
702.00 kJ/mol  
35
21st Energy Level
568.00 kJ/mol  
99+
702.00 kJ/mol  
99+
22nd Energy Level
568.00 kJ/mol  
99+
702.00 kJ/mol  
29
23rd Energy Level
568.00 kJ/mol  
99+
702.00 kJ/mol  
99+
24th Energy Level
568.00 kJ/mol  
99+
702.50 kJ/mol  
28
25th Energy Level
568.00 kJ/mol  
99+
702.00 kJ/mol  
30
26th Energy Level
568.00 kJ/mol  
99+
702.00 kJ/mol  
29
27th Energy Level
568.00 kJ/mol  
99+
702.00 kJ/mol  
30
28th Energy Level
568.00 kJ/mol  
99+
702.00 kJ/mol  
35
29th Energy Level
568.00 kJ/mol  
99+
702.00 kJ/mol  
36
30th Energy Level
568.00 kJ/mol  
99+
702.00 kJ/mol  
30
Electrochemical Equivalent
1.72 g/amp-hr  
99+
0.52 g/amp-hr  
99+
Electron Work Function
5.89 eV  
3
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
91  
27
43  
99+
Electron Configuration
[Rn] 5f2 6d1 7s2  
[Kr] 4d5 5s2  
Crystal Structure
Tetragonal (TETR)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100  
HCP-Crystal-Structure-of-Technetium.jpg#100  
Atom
  
  
Number of Protons
91  
27
43  
99+
Number of Neutrons
122  
22
55  
99+
Number of Electrons
91  
27
43  
99+
Radius of an Atom
  
  
Atomic Radius
163.00 pm  
27
136.00 pm  
99+
Covalent Radius
200.00 pm  
11
147.00 pm  
39
Van der Waals Radius
243.00 pm  
15
200.00 pm  
35
Atomic Weight
231.04 amu  
24
98.00 amu  
99+
Atomic Volume
15.00 cm3/mol  
99+
8.50 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Molybdenum
  
Next Element
Uranium
  
Ruthenium
  
Valence Electron Potential
92.00 (-eV)  
11
180.00 (-eV)  
3
Lattice Constant
392.50 pm  
26
273.50 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.58  
36
1.60  
21
Mechanical
Density
  
  
Density At Room Temperature
15.37 g/cm3  
20
11.00 g/cm3  
36
Density When Liquid (at m.p.)
15.37 g/cm3  
21
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)  
32
0.00 (Pa)  
99+
Elasticity properties
  
  
Shear Modulus
16.00 GPa  
99+
27.00 GPa  
34
Bulk Modulus
47.00 GPa  
26
100.00 GPa  
16
Young's Modulus
47.00 GPa  
99+
50.00 GPa  
39
Poisson Ratio
0.23  
30
0.38  
6
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
15.37  
23
11.50  
37
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
10
0.00 H/m  
17
Susceptibility
0.00  
21
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
177.00 nΩ·m  
21
200.00 nΩ·m  
18
Electrical Conductivity
0.05 106/cm Ω  
39
0.07 106/cm Ω  
35
Electron Affinity
53.03 kJ/mol  
22
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
47.00 W/m·K  
32
50.60 W/m·K  
30
Critical Temperature
1,841.00 K  
25
2,150.00 K  
16
Thermal Expansion
9.90 µm/(m·K)  
99+
7.10 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
481.00 kJ/mol  
17
660.00 kJ/mol  
7
Enthalpy of Fusion
12.34 kJ/mol  
34
23.01 kJ/mol  
9
Enthalpy of Atomization
481.90 kJ/mol  
19
649.00 kJ/mol  
9
Standard Molar Entropy
198.10 J/mol.K  
1
181.10 J/mol.K  
2
Periodic Table >>
<< All

Compare Actinide Series

Actinide Series

Actinide Series

» More Actinide Series

Compare Actinide Series

» More Compare Actinide Series
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!