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Molybdenum vs Neptunium

Molybdenum
Neptunium
Neptunium vs Molybdenum


Periodic Table
Symbol
Mo  
Np  
Group Number
6  
12
3  
15
Period Number
5  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7439987  
99+
7439998  
99+
Space Group Name
Im_ 3m  
Pnma  
Space Group Number
229.00  
2
62.00  
14
Facts
Interesting Facts
  • Molybdenum is highly reactive metal, hence not found free in nature .
  • Till 18th century Molybdenum element were often mistaken as a carbon or Lead.
  
Neptunium was the first transuranium element to be discovered.  
Sources
Found in Minerals, Mining, Ores of Minerals  
Made by Bombarding Uranium with Neutrons, Ores of metals  
History
  
  
Who Discovered
Carl Wilhelm Scheele  
Edwin McMillan and Philip H. Abelson  
Discovery
In 1778  
In 1940  
Abundance
  
  
Abundance In Universe
0.00 %  
20
0.00 %  
40
Abundance In Sun
0.00 %  
19
0.00 %  
26
Abundance In Meteorites
0.00 %  
24
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
39
0.00 %  
99+
Abundance In Oceans
0.00 %  
9
-  
Abundance In Humans
0.00 %  
17
0.00 %  
24
Uses
Uses & Benefits
  • 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.
  
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
  
Industrial Uses
Aerospace Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
Toxic  
Toxic  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
31
0.00 Blood/mg dm-3  
40
In Bone
0.70 p.p.m.  
20
0.00 p.p.m.  
99+
Physical
Melting Point
2,617.00 °C  
5
640.00 °C  
99+
Boiling Point
4,612.00 °C  
9
3,902.00 °C  
13
Appearance
  
  
Physical State
Solid  
Solid  
Color
Gray  
Silver  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
5.50  
7
6.00  
6
Brinell Hardness
1,370.00 MPa  
7
622.00 MPa  
23
Vickers Hardness
1,400.00 MPa  
11
640.00 MPa  
23
Speed of Sound
5,400.00 m/s  
9
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.00  
15
1.30  
99+
Reflectivity
58.00 %  
25
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Mo  
Np  
Isotopes
  
  
Known Isotopes
25  
14
20  
19
Electronegativity
  
  
Pauling Electronegativity
2.16  
6
1.36  
30
Sanderson Electronegativity
1.15  
34
1.36  
23
Allred Rochow Electronegativity
1.30  
25
1.22  
27
Mulliken-Jaffe Electronegativity
2.16  
7
1.36  
31
Allen Electronegativity
2.16  
3
1.36  
37
Electropositivity
  
  
Pauling Electropositivity
1.84  
99+
2.64  
25
Ionization Energies
  
  
1st Energy Level
684.30 kJ/mol  
37
604.50 kJ/mol  
99+
2nd Energy Level
1,560.00 kJ/mol  
38
1,128.00 kJ/mol  
99+
3rd Energy Level
2,618.00 kJ/mol  
99+
1,997.00 kJ/mol  
99+
4th Energy Level
4,480.00 kJ/mol  
36
3,242.00 kJ/mol  
99+
5th Energy Level
5,257.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
6th Energy Level
6,640.80 kJ/mol  
99+
5,785.00 kJ/mol  
99+
7th Energy level
12,125.00 kJ/mol  
13
6,040.00 kJ/mol  
99+
8th Energy Level
13,860.00 kJ/mol  
16
6,040.00 kJ/mol  
99+
9th Energy Level
15,835.00 kJ/mol  
16
6,180.00 kJ/mol  
99+
10th Energy Level
17,980.00 kJ/mol  
18
6,180.00 kJ/mol  
99+
11th Energy Level
20,190.00 kJ/mol  
17
6,180.00 kJ/mol  
99+
12th Energy Level
22,219.00 kJ/mol  
38
61,800.00 kJ/mol  
13
13th Energy Level
26,930.00 kJ/mol  
13
6,180.00 kJ/mol  
40
14th Energy Level
29,196.00 kJ/mol  
13
6,180.00 kJ/mol  
29
15th Energy Level
52,490.00 kJ/mol  
99+
60,600.00 kJ/mol  
99+
16th Energy Level
55,000.00 kJ/mol  
99+
60,420.00 kJ/mol  
31
17th Energy Level
61,400.00 kJ/mol  
9
604.00 kJ/mol  
99+
18th Energy Level
67,700.00 kJ/mol  
9
6,040.00 kJ/mol  
99+
19th Energy Level
74,000.00 kJ/mol  
9
604.50 kJ/mol  
99+
20th Energy Level
80,400.00 kJ/mol  
10
604.00 kJ/mol  
99+
21st Energy Level
87,000.00 kJ/mol  
9
6,040.00 kJ/mol  
17
22nd Energy Level
93,400.00 kJ/mol  
7
604.00 kJ/mol  
40
23rd Energy Level
98,420.00 kJ/mol  
6
6,040.00 kJ/mol  
18
24th Energy Level
104,400.00 kJ/mol  
2
604.50 kJ/mol  
99+
25th Energy Level
121,900.00 kJ/mol  
1
604.00 kJ/mol  
99+
26th Energy Level
127,700.00 kJ/mol  
1
604.00 kJ/mol  
99+
27th Energy Level
133,800.00 kJ/mol  
1
604.00 kJ/mol  
99+
28th Energy Level
139,800.00 kJ/mol  
1
604.00 kJ/mol  
99+
29th Energy Level
148,100.00 kJ/mol  
1
604.00 kJ/mol  
99+
30th Energy Level
154,500.00 kJ/mol  
1
604.00 kJ/mol  
99+
Electrochemical Equivalent
0.89 g/amp-hr  
99+
1.77 g/amp-hr  
99+
Electron Work Function
4.60 eV  
17
4.90 eV  
12
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
42  
99+
93  
25
Electron Configuration
[Kr] 4d5 5s1  
[Rn] 5f4 6d1 7s2  
Crystal Structure
Body Centered Cubic (BCC)  
Orthorhombic (ORTH)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
ORTH-Crystal-Structure-of-Neptunium.jpg#100  
Atom
  
  
Number of Protons
42  
99+
93  
25
Number of Neutrons
54  
99+
144  
15
Number of Electrons
42  
99+
93  
25
Radius of an Atom
  
  
Atomic Radius
139.00 pm  
99+
155.00 pm  
32
Covalent Radius
154.00 pm  
34
190.00 pm  
18
Van der Waals Radius
200.00 pm  
35
221.00 pm  
27
Atomic Weight
95.95 amu  
99+
237.00 amu  
22
Atomic Volume
9.40 cm3/mol  
99+
11.62 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Niobium
  
Uranium
  
Next Element
Technetium
  
Plutonium
  
Valence Electron Potential
88.60 (-eV)  
13
96.00 (-eV)  
9
Lattice Constant
314.70 pm  
99+
666.30 pm  
3
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.03  
99+
1.43  
99+
Mechanical
Density
  
  
Density At Room Temperature
10.28 g/cm3  
39
19.38 g/cm3  
14
Density When Liquid (at m.p.)
9.33 g/cm3  
99+
20.25 g/cm3  
10
Tensile Strength
324.00 MPa  
15
125.00 MPa  
26
Viscosity
0.00  
5
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
27
0.11 (Pa)  
17
Elasticity properties
  
  
Shear Modulus
126.00 GPa  
8
5.60 GPa  
99+
Bulk Modulus
230.00 GPa  
6
180.00 GPa  
9
Young's Modulus
329.00 GPa  
6
46.00 GPa  
99+
Poisson Ratio
0.31  
13
0.26  
22
Other Mechanical Properties
Ductile, Weldable  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
10.22  
40
20.25  
15
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
9
0.00 H/m  
6
Susceptibility
0.00  
29
0.00  
24
Electrical Properties
  
  
Electrical Property
Semiconductor  
Conductor  
Resistivity
53.40 nΩ·m  
99+
1.22 nΩ·m  
99+
Electrical Conductivity
0.19 106/cm Ω  
11
0.01 106/cm Ω  
99+
Electron Affinity
71.90 kJ/mol  
16
118.60 kJ/mol  
6
Thermal
Specific Heat
0.25 J/(kg K)  
21
0.12 J/(kg K)  
99+
Molar Heat Capacity
24.06 J/mol·K  
99+
29.46 J/mol·K  
10
Thermal Conductivity
138.00 W/m·K  
12
6.30 W/m·K  
99+
Critical Temperature
2,896.00 K  
6
913.00 K  
99+
Thermal Expansion
4.80 µm/(m·K)  
99+
13.30 µm/(m·K)  
35
Enthalpy
  
  
Enthalpy of Vaporization
594.10 kJ/mol  
9
336.00 kJ/mol  
39
Enthalpy of Fusion
27.61 kJ/mol  
5
3.20 kJ/mol  
99+
Enthalpy of Atomization
653.00 kJ/mol  
7
275.30 kJ/mol  
99+
Standard Molar Entropy
28.70 J/mol.K  
99+
64.00 J/mol.K  
21
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