Technetium vs Protactinium
Periodic Table
Symbol
Tc
Pa
Group Number
7
11
Not Available
Period Number
5
7
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
7440268
99+
7440133
99+
Space Group Name
P63/mmc
I4/mmm
Space Group Number
194.00
5
139.00
8
Facts
Interesting Facts
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
- Protactinium metal has 29 isotopes.
- Isotopes of Protactinium-231 used in nuclear weapon.
Sources
Made by Bombarding Molybdenum with Deuterons
Found in Uranium Ores, Mining, Ores of metals
History
Who Discovered
Emilio Segrè and Carlo Perriero
William Crookes
Discovery
In 1937
In 1900
Abundance
Abundance In Earth's Crust
Not Available
0.00 %
99+
Abundance In Oceans
Not Available
0.00 %
99+
Uses
Uses & Benefits
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
- Currently known uses of Protactinium metal are limited to research purpose only.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
Alloys, Nuclear Research, Research Purposes
NA
Biological Properties
Toxicity
Low Toxic
Highly Toxic
Present in Human Body
No
No
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
37
In Bone
0.00 p.p.m.
36
0.00 p.p.m.
36
Physical Properties
Melting Point
2,200.00 °C
9
1,568.00 °C
21
Boiling Point
4,877.00 °C
7
4,027.00 °C
12
Appearance
Physical State
Solid
Solid
Color
Shiny Gray
Silver
Luster
NA
Metallic
Hardness
Speed of Sound
16,200.00 m/s
1
Not Available
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
Pa
Isotopes
Known Isotopes
18
21
27
12
Electronegativity
Pauling Electronegativity
1.90
11
1.50
27
Allred Rochow Electronegativity
1.36
20
1.14
28
Allen Electronegativity
1.51
28
Not Available
Electropositivity
Pauling Electropositivity
2.10
99+
2.50
27
Ionization Energies
1st Energy Level
702.00 kJ/mol
36
568.00 kJ/mol
99+
2nd Energy Level
1,470.00 kJ/mol
99+
1,128.00 kJ/mol
99+
3rd Energy Level
2,850.00 kJ/mol
33
1,814.00 kJ/mol
99+
4th Energy Level
Not Available
2,991.00 kJ/mol
99+
Electrochemical Equivalent
0.52 g/amp-hr
99+
1.72 g/amp-hr
99+
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
43
99+
91
27
Electron Configuration
[Kr] 4d5 5s2
[Rn] 5f2 6d1 7s2
Crystal Structure
Hexagonal Close Packed (HCP)
Tetragonal (TETR)
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100
TETR-Crystal-Structure-of-Protactinium.jpg#100
Atom
Number of Protons
43
99+
91
27
Number of Neutrons
55
99+
122
21
Number of Electrons
43
99+
91
27
Radius of an Atom
Atomic Radius
136.00 pm
99+
163.00 pm
25
Covalent Radius
147.00 pm
37
200.00 pm
11
Van der Waals Radius
200.00 pm
28
243.00 pm
11
Atomic Weight
98.00 amu
99+
231.04 amu
24
Atomic Volume
8.50 cm3/mol
99+
15.00 cm3/mol
34
Adjacent Atomic Numbers
Valence Electron Potential
180.00 (-eV)
3
92.00 (-eV)
11
Lattice Constant
273.50 pm
99+
392.50 pm
23
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
15.37 g/cm3
20
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
Unknown
Magnetic Properties
Magnetic Characteristics
Specific Gravity
11.50
24
15.37
12
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
200.00 nΩ·m
18
177.00 nΩ·m
21
Electrical Conductivity
0.07 106/cm Ω
30
0.05 106/cm Ω
34
Electron Affinity
53.00 kJ/mol
18
Not Available
Thermal Properties
Specific Heat
0.21 J/(kg K)
29
0.12 J/(kg K)
40
Molar Heat Capacity
24.27 J/mol·K
99+
Not Available
Thermal Conductivity
50.60 W/m·K
30
47.00 W/m·K
32
Critical Temperature
Not Available
Not Available
Thermal Expansion
7.10 µm/(m·K)
99+
9.90 µm/(m·K)
40
Enthalpy
Enthalpy of Vaporization
660.00 kJ/mol
6
Not Available
Enthalpy of Fusion
23.01 kJ/mol
9
12.34 kJ/mol
28
Enthalpy of Atomization
649.00 kJ/mol
8
Not Available
Standard Molar Entropy
181.10 J/mol.K
2
198.10 J/mol.K
1
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