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Protactinium vs Tantalum

Protactinium
Tantalum
Tantalum vs Protactinium


Periodic Table
Symbol
Pa   
Ta   
Group Number
Not Available   
5   
13
Period Number
7   
6   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440133   
99+
7440257   
99+
Space Group Name
I4/mmm   
Im_ 3m   
Space Group Number
139.00   
8
229.00   
1
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • Tantalum metal is known as corrosion resistance.
  • Tantalum metal can easily fabricated and It is a good conductor of heat and electricity.
  
Sources
Found in Uranium Ores, Mining, Ores of metals   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
William Crookes   
Anders Gustaf Ekeberg   
Discovery
In 1900   
In 1802   
Abundance
  
  
Abundance In Universe
Not Available   
8 * 10-9 %   
31
Abundance In Meteorites
Not Available   
0.00 %   
99+
Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
37
Abundance In Oceans
0.00 %   
99+
0.00 %   
31
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • Tantalum metal is mainly used in the manufacturing of electron components. Its Oxide layer acts as an insulator.
  • Tantalum metal is also used in surgical transplant like replacement of bone, skull plates and as a woven gauze.
  
Industrial Uses
NA   
Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys   
Biological Properties
  
  
Toxicity
Highly Toxic   
Low Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
In Bone
0.00 p.p.m.   
36
0.03 p.p.m.   
28
Physical Properties
Melting Point
1,568.00 °C   
21
2,996.00 °C   
4
Boiling Point
4,027.00 °C   
12
5,425.00 °C   
4
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Gray Blue   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
6.50   
5
Brinell Hardness
Not Available   
440.00 MPa   
28
Vickers Hardness
Not Available   
870.00 MPa   
12
Speed of Sound
Not Available   
3,400.00 m/s   
22
Optical Properties
  
  
Reflectivity
Not Available   
78.00 %   
6
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   
Ta   
Isotopes
  
  
Known Isotopes
27   
12
31   
8
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
1.50   
27
Allred Rochow Electronegativity
1.14   
28
1.33   
22
Allen Electronegativity
Not Available   
1.34   
33
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
2.50   
27
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
761.00 kJ/mol   
18
2nd Energy Level
1,128.00 kJ/mol   
99+
1,500.00 kJ/mol   
40
3rd Energy Level
1,814.00 kJ/mol   
99+
Not Available   
4th Energy Level
2,991.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.72 g/amp-hr   
99+
1.35 g/amp-hr   
99+
Electron Work Function
Not Available   
4.25 eV   
21
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
91   
27
73   
99+
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Xe] 4f14 5d3 6s2   
Crystal Structure
Tetragonal (TETR)   
Body Centered Cubic (BCC)   
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
91   
27
73   
99+
Number of Neutrons
122   
21
108   
28
Number of Electrons
91   
27
73   
99+
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
146.00 pm   
35
Covalent Radius
200.00 pm   
11
170.00 pm   
25
Van der Waals Radius
243.00 pm   
11
200.00 pm   
28
Atomic Weight
231.04 amu   
24
180.95 amu   
38
Atomic Volume
15.00 cm3/mol   
34
10.90 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Hafnium
  
Next Element
Uranium
  
Tungsten
  
Valence Electron Potential
92.00 (-eV)   
11
110.00 (-eV)   
7
Lattice Constant
392.50 pm   
23
330.13 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
15.37 g/cm3   
20
16.69 g/cm3   
18
Density When Liquid (at m.p.)
Not Available   
15.00 g/cm3   
9
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available   
0.00 (Pa)   
31
Elasticity properties
  
  
Shear Modulus
Not Available   
69.00 GPa   
13
Bulk Modulus
Not Available   
200.00 GPa   
8
Young's Modulus
Not Available   
186.00 GPa   
13
Poisson Ratio
Not Available   
0.34   
10
Other Mechanical Properties
Unknown   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
15.37   
12
16.65   
11
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
177.00 nΩ·m   
21
131.00 nΩ·m   
25
Electrical Conductivity
0.05 106/cm Ω   
34
0.08 106/cm Ω   
27
Electron Affinity
Not Available   
31.00 kJ/mol   
29
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.14 J/(kg K)   
37
Molar Heat Capacity
Not Available   
25.36 J/mol·K   
99+
Thermal Conductivity
47.00 W/m·K   
32
57.50 W/m·K   
27
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
9.90 µm/(m·K)   
40
6.30 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
753.10 kJ/mol   
2
Enthalpy of Fusion
12.34 kJ/mol   
28
31.40 kJ/mol   
3
Enthalpy of Atomization
Not Available   
782.00 kJ/mol   
3
Standard Molar Entropy
198.10 J/mol.K   
1
41.50 J/mol.K   
37
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