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Neptunium vs Rhenium

Neptunium
Rhenium
Rhenium vs Neptunium


Periodic Table
Symbol
Np  
Re  
Group Number
3  
15
7  
11
Period Number
7  
6  
Block
f block  
d block  
Element Family
Actinide  
Transition Metal  
CAS Number
7439998  
99+
7440155  
99+
Space Group Name
Pnma  
P63/mmc  
Space Group Number
62.00  
14
194.00  
7
Facts
Interesting Facts
Neptunium was the first transuranium element to be discovered.  
  • Chemical properties of Rhenium are similar to Manganese.
  • Rhenium metal is created while refining Molybdenum.
  
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Edwin McMillan and Philip H. Abelson  
Masataka Ogawa  
Discovery
In 1940  
In 1908  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
30
Abundance In Sun
0.00 %  
26
0.00 %  
29
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
0.00 %  
34
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
  
  • Alloys of Rhenium are used as an electric contact material. It can resist withstand arc corrosion.
  • Its catalysts are used in hydrogenation of fine chemicals. Its Alloy with nickel is used to produce turbine blades.
  
Industrial Uses
-  
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
Alloys  
Biological Properties
  
  
Toxicity
Toxic  
Low Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
37
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
640.00 °C  
99+
3,180.00 °C  
2
Boiling Point
3,902.00 °C  
13
5,627.00 °C  
2
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silvery Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
7.00  
3
Brinell Hardness
622.00 MPa  
23
1,320.00 MPa  
8
Vickers Hardness
640.00 MPa  
23
1,350.00 MPa  
12
Speed of Sound
2,260.00 m/s  
99+
4,700.00 m/s  
19
Optical Properties
  
  
Refractive Index
1.30  
99+
1.90  
18
Reflectivity
64.00 %  
19
70.00 %  
13
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Np  
Re  
Isotopes
  
  
Known Isotopes
20  
19
33  
6
Electronegativity
  
  
Pauling Electronegativity
1.36  
30
1.90  
12
Sanderson Electronegativity
1.36  
23
1.90  
13
Allred Rochow Electronegativity
1.22  
27
1.46  
16
Mulliken-Jaffe Electronegativity
1.36  
31
1.90  
13
Allen Electronegativity
1.36  
37
1.60  
24
Electropositivity
  
  
Pauling Electropositivity
2.64  
25
2.10  
99+
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol  
99+
760.00 kJ/mol  
20
2nd Energy Level
1,128.00 kJ/mol  
99+
1,260.00 kJ/mol  
99+
3rd Energy Level
1,997.00 kJ/mol  
99+
2,510.00 kJ/mol  
99+
4th Energy Level
3,242.00 kJ/mol  
99+
3,640.00 kJ/mol  
99+
5th Energy Level
6,180.00 kJ/mol  
99+
7,600.00 kJ/mol  
20
6th Energy Level
5,785.00 kJ/mol  
99+
7,600.00 kJ/mol  
37
7th Energy level
6,040.00 kJ/mol  
99+
7,600.00 kJ/mol  
31
8th Energy Level
6,040.00 kJ/mol  
99+
5,560.00 kJ/mol  
99+
9th Energy Level
6,180.00 kJ/mol  
99+
5,560.00 kJ/mol  
99+
10th Energy Level
6,180.00 kJ/mol  
99+
7,600.00 kJ/mol  
31
11th Energy Level
6,180.00 kJ/mol  
99+
7,600.00 kJ/mol  
30
12th Energy Level
61,800.00 kJ/mol  
13
7,600.00 kJ/mol  
99+
13th Energy Level
6,180.00 kJ/mol  
40
7,600.00 kJ/mol  
23
14th Energy Level
6,180.00 kJ/mol  
29
7,600.00 kJ/mol  
20
15th Energy Level
60,600.00 kJ/mol  
99+
76,000.00 kJ/mol  
20
16th Energy Level
60,420.00 kJ/mol  
31
76,000.00 kJ/mol  
15
17th Energy Level
604.00 kJ/mol  
99+
760.10 kJ/mol  
36
18th Energy Level
6,040.00 kJ/mol  
99+
7,600.00 kJ/mol  
26
19th Energy Level
604.50 kJ/mol  
99+
760.40 kJ/mol  
33
20th Energy Level
604.00 kJ/mol  
99+
760.00 kJ/mol  
27
21st Energy Level
6,040.00 kJ/mol  
17
760.00 kJ/mol  
99+
22nd Energy Level
604.00 kJ/mol  
40
760.00 kJ/mol  
21
23rd Energy Level
6,040.00 kJ/mol  
18
760.00 kJ/mol  
99+
24th Energy Level
604.50 kJ/mol  
99+
760.00 kJ/mol  
18
25th Energy Level
604.00 kJ/mol  
99+
760.00 kJ/mol  
18
26th Energy Level
604.00 kJ/mol  
99+
760.00 kJ/mol  
18
27th Energy Level
604.00 kJ/mol  
99+
760.00 kJ/mol  
17
28th Energy Level
604.00 kJ/mol  
99+
760.00 kJ/mol  
23
29th Energy Level
604.00 kJ/mol  
99+
760.00 kJ/mol  
24
30th Energy Level
604.00 kJ/mol  
99+
760.00 kJ/mol  
18
Electrochemical Equivalent
1.77 g/amp-hr  
99+
0.99 g/amp-hr  
99+
Electron Work Function
4.90 eV  
12
4.96 eV  
11
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
93  
25
75  
99+
Electron Configuration
[Rn] 5f4 6d1 7s2  
[Xe] 4f14 5d5 6s2  
Crystal Structure
Orthorhombic (ORTH)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
93  
25
75  
40
Number of Neutrons
144  
15
111  
27
Number of Electrons
93  
25
75  
40
Radius of an Atom
  
  
Atomic Radius
155.00 pm  
32
137.00 pm  
99+
Covalent Radius
190.00 pm  
18
151.00 pm  
36
Van der Waals Radius
221.00 pm  
27
200.00 pm  
35
Atomic Weight
237.00 amu  
22
186.21 amu  
36
Atomic Volume
11.62 cm3/mol  
99+
8.85 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Uranium
  
Tungsten
  
Next Element
Plutonium
  
Osmium
  
Valence Electron Potential
96.00 (-eV)  
9
180.00 (-eV)  
3
Lattice Constant
666.30 pm  
3
276.10 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.43  
99+
1.62  
17
Mechanical
Density
  
  
Density At Room Temperature
19.38 g/cm3  
14
21.02 g/cm3  
12
Density When Liquid (at m.p.)
20.25 g/cm3  
10
18.90 g/cm3  
14
Tensile Strength
125.00 MPa  
26
1,070.00 MPa  
3
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.11 (Pa)  
17
0.00 (Pa)  
40
Elasticity properties
  
  
Shear Modulus
5.60 GPa  
99+
178.00 GPa  
3
Bulk Modulus
180.00 GPa  
9
370.00 GPa  
2
Young's Modulus
46.00 GPa  
99+
463.00 GPa  
2
Poisson Ratio
0.26  
22
0.30  
14
Other Mechanical Properties
Ductile  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
20.25  
15
21.02  
14
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
6
0.00 H/m  
8
Susceptibility
0.00  
24
0.00  
26
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
1.22 nΩ·m  
99+
193.00 nΩ·m  
20
Electrical Conductivity
0.01 106/cm Ω  
99+
0.05 106/cm Ω  
38
Electron Affinity
118.60 kJ/mol  
6
14.50 kJ/mol  
99+
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.13 J/(kg K)  
40
Molar Heat Capacity
29.46 J/mol·K  
10
25.48 J/mol·K  
99+
Thermal Conductivity
6.30 W/m·K  
99+
48.00 W/m·K  
31
Critical Temperature
913.00 K  
99+
3,459.00 K  
2
Thermal Expansion
13.30 µm/(m·K)  
35
6.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
336.00 kJ/mol  
39
707.10 kJ/mol  
4
Enthalpy of Fusion
3.20 kJ/mol  
99+
33.05 kJ/mol  
2
Enthalpy of Atomization
275.30 kJ/mol  
99+
791.00 kJ/mol  
2
Standard Molar Entropy
64.00 J/mol.K  
21
36.90 J/mol.K  
99+
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