Protactinium vs Technetium
Periodic Table
Symbol
Pa
Tc
Group Number
Not Available
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
8
194.00
5
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 Earth's Crust
0.00 %
99+
Not Available
Abundance In Oceans
0.00 %
99+
Not Available
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
NA
NA
Medical Uses
NA
NA
Other Uses
NA
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
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
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
NA
Hardness
Speed of Sound
Not Available
16,200.00 m/s
1
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
Pa
Tc
Isotopes
Known Isotopes
27
12
18
21
Electronegativity
Pauling Electronegativity
1.50
27
1.90
11
Allred Rochow Electronegativity
1.14
28
1.36
20
Allen Electronegativity
Not Available
1.51
28
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
33
4th Energy Level
2,991.00 kJ/mol
99+
Not Available
Electrochemical Equivalent
1.72 g/amp-hr
99+
0.52 g/amp-hr
99+
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
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
21
55
99+
Number of Electrons
91
27
43
99+
Radius of an Atom
Atomic Radius
163.00 pm
25
136.00 pm
99+
Covalent Radius
200.00 pm
11
147.00 pm
37
Van der Waals Radius
243.00 pm
11
200.00 pm
28
Atomic Weight
231.04 amu
24
98.00 amu
99+
Atomic Volume
15.00 cm3/mol
34
8.50 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
92.00 (-eV)
11
180.00 (-eV)
3
Lattice Constant
392.50 pm
23
273.50 pm
99+
Lattice Angles
π/2, π/2, π/2
π/2, π/2, 2 π/3
Lattice C/A Ratio
Not Available
1.60
5
Mechanical Properties
Density
Density At Room Temperature
15.37 g/cm3
20
11.00 g/cm3
34
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
Unknown
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
15.37
12
11.50
24
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
177.00 nΩ·m
21
200.00 nΩ·m
18
Electrical Conductivity
0.05 106/cm Ω
34
0.07 106/cm Ω
30
Electron Affinity
Not Available
53.00 kJ/mol
18
Thermal Properties
Specific Heat
0.12 J/(kg K)
40
0.21 J/(kg K)
29
Molar Heat Capacity
Not Available
24.27 J/mol·K
99+
Thermal Conductivity
47.00 W/m·K
32
50.60 W/m·K
30
Critical Temperature
Not Available
Not Available
Thermal Expansion
9.90 µm/(m·K)
40
7.10 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
Not Available
660.00 kJ/mol
6
Enthalpy of Fusion
12.34 kJ/mol
28
23.01 kJ/mol
9
Enthalpy of Atomization
Not Available
649.00 kJ/mol
8
Standard Molar Entropy
198.10 J/mol.K
1
181.10 J/mol.K
2
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