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Neptunium vs Niobium

Neptunium
Niobium
Niobium vs Neptunium


Periodic Table
Symbol
Np  
Nb  
Group Number
3  
15
5  
13
Period Number
7  
5  
Block
f block  
d block  
Element Family
Actinide  
Transition Metal  
CAS Number
7439998  
99+
7440031  
99+
Space Group Name
Pnma  
Im_ 3m  
Space Group Number
62.00  
14
229.00  
2
Facts
Interesting Facts
Neptunium was the first transuranium element to be discovered.  
  • Niobium metal was used to get called Columbium in past.
  • Niobium metal found freely in nature (abundance).
  
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals  
By-product of Tin Extraction, Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Edwin McMillan and Philip H. Abelson  
Charles Hatchett  
Discovery
In 1940  
In 1801  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
23
Abundance In Sun
0.00 %  
26
0.00 %  
23
Abundance In Meteorites
0.00 %  
99+
0.00 %  
35
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
25
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.
  
  • Niobium alloys are used in jet engines and rockets and spacecraft, beams and girders for buildings and oil and gas pipelines.
  • It is used superconducting magnets in particles accelerators, NMR and MRI equipment.
  
Industrial Uses
-  
Aerospace Industry, Ammunition 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  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.01 Blood/mg dm-3  
25
In Bone
0.00 p.p.m.  
99+
0.07 p.p.m.  
30
Physical
Melting Point
640.00 °C  
99+
2,468.00 °C  
6
Boiling Point
3,902.00 °C  
13
2,468.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
6.00  
6
Brinell Hardness
622.00 MPa  
23
735.00 MPa  
15
Vickers Hardness
640.00 MPa  
23
870.00 MPa  
19
Speed of Sound
2,260.00 m/s  
99+
3,480.00 m/s  
31
Optical Properties
  
  
Refractive Index
1.30  
99+
2.30  
8
Reflectivity
64.00 %  
19
70.00 %  
13
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Np  
Nb  
Isotopes
  
  
Known Isotopes
20  
19
17  
22
Electronegativity
  
  
Pauling Electronegativity
1.36  
30
1.60  
24
Sanderson Electronegativity
1.36  
23
1.42  
20
Allred Rochow Electronegativity
1.22  
27
1.23  
26
Mulliken-Jaffe Electronegativity
1.36  
31
1.60  
22
Allen Electronegativity
1.36  
37
1.41  
35
Electropositivity
  
  
Pauling Electropositivity
2.64  
25
2.40  
31
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol  
99+
652.10 kJ/mol  
99+
2nd Energy Level
1,128.00 kJ/mol  
99+
1,380.00 kJ/mol  
99+
3rd Energy Level
1,997.00 kJ/mol  
99+
2,416.00 kJ/mol  
99+
4th Energy Level
3,242.00 kJ/mol  
99+
3,700.00 kJ/mol  
99+
5th Energy Level
6,180.00 kJ/mol  
99+
4,877.00 kJ/mol  
99+
6th Energy Level
5,785.00 kJ/mol  
99+
9,847.00 kJ/mol  
17
7th Energy level
6,040.00 kJ/mol  
99+
12,100.00 kJ/mol  
14
8th Energy Level
6,040.00 kJ/mol  
99+
6,520.00 kJ/mol  
99+
9th Energy Level
6,180.00 kJ/mol  
99+
5,470.00 kJ/mol  
99+
10th Energy Level
6,180.00 kJ/mol  
99+
5,470.00 kJ/mol  
99+
11th Energy Level
6,180.00 kJ/mol  
99+
6,520.00 kJ/mol  
99+
12th Energy Level
61,800.00 kJ/mol  
13
6,520.00 kJ/mol  
99+
13th Energy Level
6,180.00 kJ/mol  
40
5,470.00 kJ/mol  
99+
14th Energy Level
6,180.00 kJ/mol  
29
691.00 kJ/mol  
99+
15th Energy Level
60,600.00 kJ/mol  
99+
65,200.00 kJ/mol  
35
16th Energy Level
60,420.00 kJ/mol  
31
652.10 kJ/mol  
99+
17th Energy Level
604.00 kJ/mol  
99+
652.10 kJ/mol  
99+
18th Energy Level
6,040.00 kJ/mol  
99+
6,520.00 kJ/mol  
37
19th Energy Level
604.50 kJ/mol  
99+
652.10 kJ/mol  
99+
20th Energy Level
604.00 kJ/mol  
99+
652.00 kJ/mol  
38
21st Energy Level
6,040.00 kJ/mol  
17
652.10 kJ/mol  
99+
22nd Energy Level
604.00 kJ/mol  
40
694.00 kJ/mol  
30
23rd Energy Level
6,040.00 kJ/mol  
18
4,490.00 kJ/mol  
30
24th Energy Level
604.50 kJ/mol  
99+
652.10 kJ/mol  
33
25th Energy Level
604.00 kJ/mol  
99+
652.10 kJ/mol  
35
26th Energy Level
604.00 kJ/mol  
99+
652.10 kJ/mol  
34
27th Energy Level
604.00 kJ/mol  
99+
652.10 kJ/mol  
35
28th Energy Level
604.00 kJ/mol  
99+
652.10 kJ/mol  
40
29th Energy Level
604.00 kJ/mol  
99+
652.10 kJ/mol  
99+
30th Energy Level
604.00 kJ/mol  
99+
652.00 kJ/mol  
37
Electrochemical Equivalent
1.77 g/amp-hr  
99+
0.69 g/amp-hr  
99+
Electron Work Function
4.90 eV  
12
4.30 eV  
25
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
93  
25
41  
99+
Electron Configuration
[Rn] 5f4 6d1 7s2  
[Kr] 4d4 5s1  
Crystal Structure
Orthorhombic (ORTH)  
Body Centered Cubic (BCC)  
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
93  
25
41  
99+
Number of Neutrons
144  
15
52  
99+
Number of Electrons
93  
25
41  
99+
Radius of an Atom
  
  
Atomic Radius
155.00 pm  
32
146.00 pm  
37
Covalent Radius
190.00 pm  
18
164.00 pm  
30
Van der Waals Radius
221.00 pm  
27
200.00 pm  
35
Atomic Weight
237.00 amu  
22
92.91 amu  
99+
Atomic Volume
11.62 cm3/mol  
99+
10.87 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Uranium
  
Zirconium
  
Next Element
Plutonium
  
Molybdenum
  
Valence Electron Potential
96.00 (-eV)  
9
104.00 (-eV)  
8
Lattice Constant
666.30 pm  
3
330.04 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.43  
99+
1.47  
99+
Mechanical
Density
  
  
Density At Room Temperature
19.38 g/cm3  
14
8.57 g/cm3  
99+
Density When Liquid (at m.p.)
20.25 g/cm3  
10
8.57 g/cm3  
99+
Tensile Strength
125.00 MPa  
26
330.00 MPa  
14
Viscosity
0.00  
25
0.00  
22
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
16
Vapor Pressure at 2000 K
0.11 (Pa)  
17
0.00 (Pa)  
36
Elasticity properties
  
  
Shear Modulus
5.60 GPa  
99+
38.00 GPa  
20
Bulk Modulus
180.00 GPa  
9
170.00 GPa  
10
Young's Modulus
46.00 GPa  
99+
105.00 GPa  
22
Poisson Ratio
0.26  
22
0.40  
4
Other Mechanical Properties
Ductile  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
20.25  
15
8.57  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
6
0.00 H/m  
4
Susceptibility
0.00  
24
0.00  
30
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
1.22 nΩ·m  
99+
152.00 nΩ·m  
23
Electrical Conductivity
0.01 106/cm Ω  
99+
0.07 106/cm Ω  
33
Electron Affinity
118.60 kJ/mol  
6
86.10 kJ/mol  
14
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.26 J/(kg K)  
20
Molar Heat Capacity
29.46 J/mol·K  
10
24.60 J/mol·K  
99+
Thermal Conductivity
6.30 W/m·K  
99+
53.70 W/m·K  
29
Critical Temperature
913.00 K  
99+
2,750.00 K  
7
Thermal Expansion
13.30 µm/(m·K)  
35
7.30 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
336.00 kJ/mol  
39
696.60 kJ/mol  
5
Enthalpy of Fusion
3.20 kJ/mol  
99+
27.20 kJ/mol  
6
Enthalpy of Atomization
275.30 kJ/mol  
99+
745.00 kJ/mol  
4
Standard Molar Entropy
64.00 J/mol.K  
21
36.40 J/mol.K  
99+
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