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Niobium vs Neptunium

Niobium
Neptunium
Neptunium vs Niobium


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