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Protactinium vs Molybdenum

Protactinium
Molybdenum
Molybdenum vs Protactinium


Periodic Table
Symbol
Pa   
Mo   
Group Number
Not Available   
6   
12
Period Number
7   
5   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440133   
99+
7439987   
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.
  
  • Molybdenum is highly reactive metal, hence not found free in nature .
  • Till 18th century Molybdenum element were often mistaken as a carbon or Lead.
  
Sources
Found in Uranium Ores, Mining, Ores of metals   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
William Crookes   
Carl Wilhelm Scheele   
Discovery
In 1900   
In 1778   
Abundance
  
  
Abundance In Universe
Not Available   
5 * 10-7 %   
19
Abundance In Sun
~-9999 %   
~0.0000009 %   
19
Abundance In Meteorites
Not Available   
0.00 %   
24
Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
39
Abundance In Oceans
0.00 %   
99+
0.00 %   
9
Abundance In Humans
Not Available   
0.00 %   
14
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • Its alloys are used to make engine parts, drills, saw blade, etc.
  • Lubricant additive made up of Molybdenum disulfide is commonly used in the industry. It is also used as a catalyst.
  
Industrial Uses
NA   
Aerospace Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys   
Biological Properties
  
  
Toxicity
Highly Toxic   
Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
31
In Bone
0.00 p.p.m.   
36
0.70 p.p.m.   
18
Physical Properties
Melting Point
1,568.00 °C   
21
2,617.00 °C   
5
Boiling Point
4,027.00 °C   
12
4,612.00 °C   
9
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Gray   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
5.50   
7
Brinell Hardness
Not Available   
1,370.00 MPa   
7
Vickers Hardness
Not Available   
1,400.00 MPa   
6
Speed of Sound
Not Available   
5,400.00 m/s   
6
Optical Properties
  
  
Reflectivity
Not Available   
58.00 %   
15
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   
Mo   
Isotopes
  
  
Known Isotopes
27   
12
25   
14
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
2.16   
5
Sanderson Electronegativity
Not Available   
1.15   
19
Allred Rochow Electronegativity
1.14   
28
1.30   
24
Allen Electronegativity
Not Available   
2.16   
3
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
1.84   
99+
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
684.30 kJ/mol   
37
2nd Energy Level
1,128.00 kJ/mol   
99+
1,560.00 kJ/mol   
37
3rd Energy Level
1,814.00 kJ/mol   
99+
2,618.00 kJ/mol   
99+
4th Energy Level
2,991.00 kJ/mol   
99+
4,480.00 kJ/mol   
26
5th Energy Level
Not Available   
5,257.00 kJ/mol   
32
6th Energy Level
Not Available   
6,640.80 kJ/mol   
22
7th Energy level
Not Available   
12,125.00 kJ/mol   
13
8th Energy Level
Not Available   
13,860.00 kJ/mol   
16
9th Energy Level
Not Available   
15,835.00 kJ/mol   
16
10th Energy Level
Not Available   
17,980.00 kJ/mol   
18
11th Energy Level
Not Available   
20,190.00 kJ/mol   
17
12th Energy Level
Not Available   
22,219.00 kJ/mol   
15
13th Energy Level
Not Available   
26,930.00 kJ/mol   
13
14th Energy Level
Not Available   
29,196.00 kJ/mol   
13
15th Energy Level
Not Available   
52,490.00 kJ/mol   
7
16th Energy Level
Not Available   
55,000.00 kJ/mol   
8
17th Energy Level
Not Available   
61,400.00 kJ/mol   
9
18th Energy Level
Not Available   
67,700.00 kJ/mol   
9
19th Energy Level
Not Available   
74,000.00 kJ/mol   
9
20th Energy Level
Not Available   
80,400.00 kJ/mol   
10
21st Energy Level
Not Available   
87,000.00 kJ/mol   
9
22nd Energy Level
Not Available   
93,400.00 kJ/mol   
7
23rd Energy Level
Not Available   
98,420.00 kJ/mol   
6
24th Energy Level
Not Available   
104,400.00 kJ/mol   
2
25th Energy Level
Not Available   
121,900.00 kJ/mol   
1
26th Energy Level
Not Available   
127,700.00 kJ/mol   
1
27th Energy Level
Not Available   
133,800.00 kJ/mol   
1
28th Energy Level
Not Available   
139,800.00 kJ/mol   
1
29th Energy Level
Not Available   
148,100.00 kJ/mol   
1
30th Energy Level
Not Available   
154,500.00 kJ/mol   
1
Electrochemical Equivalent
1.72 g/amp-hr   
99+
0.89 g/amp-hr   
99+
Electron Work Function
Not Available   
4.60 eV   
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
91   
27
42   
99+
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Kr] 4d5 5s1   
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
42   
99+
Number of Neutrons
122   
21
54   
99+
Number of Electrons
91   
27
42   
99+
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
139.00 pm   
39
Covalent Radius
200.00 pm   
11
154.00 pm   
32
Van der Waals Radius
243.00 pm   
11
200.00 pm   
28
Atomic Weight
231.04 amu   
24
95.95 amu   
99+
Atomic Volume
15.00 cm3/mol   
34
9.40 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Niobium
  
Next Element
Uranium
  
Technetium
  
Valence Electron Potential
92.00 (-eV)   
11
88.60 (-eV)   
13
Lattice Constant
392.50 pm   
23
314.70 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
10.28 g/cm3   
36
Density When Liquid (at m.p.)
Not Available   
9.33 g/cm3   
20
Tensile Strength
Not Available   
324.00 MPa   
13
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available   
0.00 (Pa)   
26
Elasticity properties
  
  
Shear Modulus
Not Available   
126.00 GPa   
8
Bulk Modulus
Not Available   
230.00 GPa   
6
Young's Modulus
Not Available   
329.00 GPa   
6
Poisson Ratio
Not Available   
0.31   
13
Other Mechanical Properties
Unknown   
Ductile, Weldable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
15.37   
12
10.22   
27
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Semiconductor   
Resistivity
177.00 nΩ·m   
21
53.40 nΩ·m   
99+
Electrical Conductivity
0.05 106/cm Ω   
34
0.19 106/cm Ω   
11
Electron Affinity
Not Available   
71.90 kJ/mol   
14
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.25 J/(kg K)   
21
Molar Heat Capacity
Not Available   
24.06 J/mol·K   
99+
Thermal Conductivity
47.00 W/m·K   
32
138.00 W/m·K   
12
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
9.90 µm/(m·K)   
40
4.80 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
594.10 kJ/mol   
8
Enthalpy of Fusion
12.34 kJ/mol   
28
27.61 kJ/mol   
5
Enthalpy of Atomization
Not Available   
653.00 kJ/mol   
7
Standard Molar Entropy
198.10 J/mol.K   
1
28.70 J/mol.K   
99+
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