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Praseodymium vs Molybdenum

Praseodymium
Molybdenum
Molybdenum vs Praseodymium


Periodic Table
Symbol
Pr  
Mo  
Group Number
3  
15
6  
12
Period Number
6  
5  
Block
f block  
d block  
Element Family
Lanthanide  
Transition Metal  
CAS Number
7440100  
99+
7439987  
99+
Space Group Name
P63/mmc  
Im_ 3m  
Space Group Number
194.00  
7
229.00  
2
Facts
Interesting Facts
  • Praseodymium metal is synthetically produced metal.
  • Praseodymium is used as possible fuel for radioactive generators.
  
  • 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 Minerals, Mining, Ores of Minerals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
-  
Carl Wilhelm Scheele  
Discovery
In 1885  
In 1778  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
20
Abundance In Sun
0.00 %  
26
0.00 %  
19
Abundance In Meteorites
0.00 %  
40
0.00 %  
24
Abundance In Earth's Crust
0.00 %  
27
0.00 %  
39
Abundance In Oceans
0.00 %  
39
0.00 %  
9
Abundance In Humans
0.00 %  
24
0.00 %  
17
Uses
Uses & Benefits
  • The main use of Praseodymium include alloys. Praseodymium –Magnesium alloy is used in aircraft engines due to its high strength.
  • This metal is also used while making a permanent magnets.
  
  • 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
Chemical Industry  
Aerospace Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Moderately Toxic  
Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
33
0.00 Blood/mg dm-3  
31
In Bone
0.00 p.p.m.  
99+
0.70 p.p.m.  
20
Physical
Melting Point
935.00 °C  
99+
2,617.00 °C  
5
Boiling Point
3,130.00 °C  
28
4,612.00 °C  
9
Appearance
  
  
Physical State
Solid  
Solid  
Color
Grayish White  
Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
4.00  
11
5.50  
7
Brinell Hardness
481.00 MPa  
29
1,370.00 MPa  
7
Vickers Hardness
400.00 MPa  
99+
1,400.00 MPa  
11
Speed of Sound
2,280.00 m/s  
99+
5,400.00 m/s  
9
Optical Properties
  
  
Refractive Index
1.64  
30
2.00  
15
Reflectivity
60.00 %  
23
58.00 %  
25
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Pr  
Mo  
Isotopes
  
  
Known Isotopes
31  
8
25  
14
Electronegativity
  
  
Pauling Electronegativity
1.13  
99+
2.16  
6
Sanderson Electronegativity
1.13  
36
1.15  
34
Allred Rochow Electronegativity
1.07  
33
1.30  
25
Mulliken-Jaffe Electronegativity
1.13  
99+
2.16  
7
Allen Electronegativity
1.13  
99+
2.16  
3
Electropositivity
  
  
Pauling Electropositivity
2.87  
12
1.84  
99+
Ionization Energies
  
  
1st Energy Level
527.00 kJ/mol  
99+
684.30 kJ/mol  
37
2nd Energy Level
1,020.00 kJ/mol  
99+
1,560.00 kJ/mol  
38
3rd Energy Level
2,086.00 kJ/mol  
99+
2,618.00 kJ/mol  
99+
4th Energy Level
3,761.00 kJ/mol  
99+
4,480.00 kJ/mol  
36
5th Energy Level
5,551.00 kJ/mol  
99+
5,257.00 kJ/mol  
99+
6th Energy Level
5,270.00 kJ/mol  
99+
6,640.80 kJ/mol  
99+
7th Energy level
5,270.00 kJ/mol  
99+
12,125.00 kJ/mol  
13
8th Energy Level
5,270.00 kJ/mol  
99+
13,860.00 kJ/mol  
16
9th Energy Level
5,270.00 kJ/mol  
99+
15,835.00 kJ/mol  
16
10th Energy Level
5,270.00 kJ/mol  
99+
17,980.00 kJ/mol  
18
11th Energy Level
5,274.00 kJ/mol  
99+
20,190.00 kJ/mol  
17
12th Energy Level
5,270.00 kJ/mol  
99+
22,219.00 kJ/mol  
38
13th Energy Level
5,270.00 kJ/mol  
99+
26,930.00 kJ/mol  
13
14th Energy Level
5,270.00 kJ/mol  
99+
29,196.00 kJ/mol  
13
15th Energy Level
52,700.00 kJ/mol  
99+
52,490.00 kJ/mol  
99+
16th Energy Level
52,700.00 kJ/mol  
99+
55,000.00 kJ/mol  
99+
17th Energy Level
527.30 kJ/mol  
99+
61,400.00 kJ/mol  
9
18th Energy Level
5,270.00 kJ/mol  
99+
67,700.00 kJ/mol  
9
19th Energy Level
527.30 kJ/mol  
99+
74,000.00 kJ/mol  
9
20th Energy Level
527.00 kJ/mol  
99+
80,400.00 kJ/mol  
10
21st Energy Level
527.00 kJ/mol  
99+
87,000.00 kJ/mol  
9
22nd Energy Level
527.00 kJ/mol  
99+
93,400.00 kJ/mol  
7
23rd Energy Level
527.00 kJ/mol  
99+
98,420.00 kJ/mol  
6
24th Energy Level
527.40 kJ/mol  
99+
104,400.00 kJ/mol  
2
25th Energy Level
527.00 kJ/mol  
99+
121,900.00 kJ/mol  
1
26th Energy Level
527.40 kJ/mol  
99+
127,700.00 kJ/mol  
1
27th Energy Level
527.40 kJ/mol  
99+
133,800.00 kJ/mol  
1
28th Energy Level
527.40 kJ/mol  
99+
139,800.00 kJ/mol  
1
29th Energy Level
527.00 kJ/mol  
99+
148,100.00 kJ/mol  
1
30th Energy Level
527.00 kJ/mol  
99+
154,500.00 kJ/mol  
1
Electrochemical Equivalent
1.75 g/amp-hr  
99+
0.89 g/amp-hr  
99+
Electron Work Function
2.70 eV  
99+
4.60 eV  
17
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes  
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
59  
99+
42  
99+
Electron Configuration
[Xe] 4f3 6s2  
[Kr] 4d5 5s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Body Centered Cubic (BCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Praseodymium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
59  
99+
42  
99+
Number of Neutrons
82  
99+
54  
99+
Number of Electrons
59  
99+
42  
99+
Radius of an Atom
  
  
Atomic Radius
182.00 pm  
13
139.00 pm  
99+
Covalent Radius
203.00 pm  
9
154.00 pm  
34
Van der Waals Radius
239.00 pm  
18
200.00 pm  
35
Atomic Weight
140.91 amu  
99+
95.95 amu  
99+
Atomic Volume
20.80 cm3/mol  
25
9.40 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Cerium
  
Niobium
  
Next Element
Neodymium
  
Technetium
  
Valence Electron Potential
42.64 (-eV)  
99+
88.60 (-eV)  
13
Lattice Constant
367.25 pm  
32
314.70 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.61  
18
1.03  
99+
Mechanical
Density
  
  
Density At Room Temperature
6.77 g/cm3  
99+
10.28 g/cm3  
39
Density When Liquid (at m.p.)
6.50 g/cm3  
99+
9.33 g/cm3  
99+
Tensile Strength
55.00 MPa  
37
324.00 MPa  
15
Viscosity
0.00  
25
0.00  
5
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
27
0.00 (Pa)  
22
Vapor Pressure at 2000 K
13.20 (Pa)  
7
0.00 (Pa)  
27
Elasticity properties
  
  
Shear Modulus
14.80 GPa  
99+
126.00 GPa  
8
Bulk Modulus
28.80 GPa  
99+
230.00 GPa  
6
Young's Modulus
37.30 GPa  
99+
329.00 GPa  
6
Poisson Ratio
0.28  
16
0.31  
13
Other Mechanical Properties
Ductile, Malleable  
Ductile, Weldable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
6.77  
99+
10.22  
40
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
12
0.00 H/m  
9
Susceptibility
0.00  
19
0.00  
29
Electrical Properties
  
  
Electrical Property
Conductor  
Semiconductor  
Resistivity
0.70 nΩ·m  
99+
53.40 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.19 106/cm Ω  
11
Electron Affinity
50.00 kJ/mol  
26
71.90 kJ/mol  
16
Thermal
Specific Heat
0.19 J/(kg K)  
33
0.25 J/(kg K)  
21
Molar Heat Capacity
27.20 J/mol·K  
24
24.06 J/mol·K  
99+
Thermal Conductivity
12.50 W/m·K  
99+
138.00 W/m·K  
12
Critical Temperature
1,208.00 K  
99+
2,896.00 K  
6
Thermal Expansion
6.70 µm/(m·K)  
99+
4.80 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
296.80 kJ/mol  
99+
594.10 kJ/mol  
9
Enthalpy of Fusion
6.89 kJ/mol  
99+
27.61 kJ/mol  
5
Enthalpy of Atomization
368.00 kJ/mol  
33
653.00 kJ/mol  
7
Standard Molar Entropy
73.20 J/mol.K  
10
28.70 J/mol.K  
99+
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