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Niobium vs Mendelevium

Niobium
Mendelevium
Mendelevium vs Niobium


Periodic Table
Symbol
Nb  
Md  
Group Number
5  
13
3  
15
Period Number
5  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7440031  
99+
7440111  
99+
Space Group Name
Im_ 3m  
-  
Space Group Number
229.00  
2
194.00  
7
Facts
Interesting Facts
  • Niobium metal was used to get called Columbium in past.
  • Niobium metal found freely in nature (abundance).
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
By-product of Tin Extraction, Found in Minerals, Mining, Ores of Minerals  
Bombarding Einsteinium with Helium Ions  
History
  
  
Who Discovered
Charles Hatchett  
Lawrence Berkeley National Laboratory  
Discovery
In 1801  
In 1955  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
40
Abundance In Sun
0.00 %  
23
-  
Abundance In Meteorites
0.00 %  
35
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
25
-  
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 Mendelevium metal are limited to research purpose only.
  
Industrial Uses
Aerospace Industry, Ammunition Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Low 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
827.00 °C  
99+
Boiling Point
2,468.00 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Gray  
-  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
-  
Brinell Hardness
735.00 MPa  
15
350.00 MPa  
36
Vickers Hardness
870.00 MPa  
19
0.00 MPa  
99+
Speed of Sound
3,480.00 m/s  
31
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.30  
8
1.30  
99+
Reflectivity
70.00 %  
13
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Nb  
Md  
Isotopes
  
  
Known Isotopes
17  
22
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.60  
24
1.30  
33
Sanderson Electronegativity
1.42  
20
1.30  
25
Allred Rochow Electronegativity
1.23  
26
1.20  
28
Mulliken-Jaffe Electronegativity
1.60  
22
1.30  
33
Allen Electronegativity
1.41  
35
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.40  
31
2.70  
22
Ionization Energies
  
  
1st Energy Level
652.10 kJ/mol  
99+
635.00 kJ/mol  
99+
2nd Energy Level
1,380.00 kJ/mol  
99+
1,235.00 kJ/mol  
99+
3rd Energy Level
2,416.00 kJ/mol  
99+
2,470.00 kJ/mol  
99+
4th Energy Level
3,700.00 kJ/mol  
99+
3,840.00 kJ/mol  
99+
5th Energy Level
4,877.00 kJ/mol  
99+
6,350.00 kJ/mol  
36
6th Energy Level
9,847.00 kJ/mol  
17
6,350.00 kJ/mol  
99+
7th Energy level
12,100.00 kJ/mol  
14
6,350.00 kJ/mol  
99+
8th Energy Level
6,520.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
9th Energy Level
5,470.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
10th Energy Level
5,470.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
11th Energy Level
6,520.00 kJ/mol  
99+
6,400.00 kJ/mol  
99+
12th Energy Level
6,520.00 kJ/mol  
99+
60,100.00 kJ/mol  
16
13th Energy Level
5,470.00 kJ/mol  
99+
6,350.00 kJ/mol  
37
14th Energy Level
691.00 kJ/mol  
99+
1,150.00 kJ/mol  
99+
15th Energy Level
65,200.00 kJ/mol  
35
63,500.00 kJ/mol  
37
16th Energy Level
652.10 kJ/mol  
99+
635.00 kJ/mol  
99+
17th Energy Level
652.10 kJ/mol  
99+
1,107.00 kJ/mol  
21
18th Energy Level
6,520.00 kJ/mol  
37
6,350.00 kJ/mol  
39
19th Energy Level
652.10 kJ/mol  
99+
635.00 kJ/mol  
99+
20th Energy Level
652.00 kJ/mol  
38
635.00 kJ/mol  
40
21st Energy Level
652.10 kJ/mol  
99+
6,350.00 kJ/mol  
13
22nd Energy Level
694.00 kJ/mol  
30
635.00 kJ/mol  
34
23rd Energy Level
4,490.00 kJ/mol  
30
6,350.00 kJ/mol  
13
24th Energy Level
652.10 kJ/mol  
33
635.00 kJ/mol  
36
25th Energy Level
652.10 kJ/mol  
35
635.00 kJ/mol  
38
26th Energy Level
652.10 kJ/mol  
34
635.00 kJ/mol  
37
27th Energy Level
652.10 kJ/mol  
35
635.00 kJ/mol  
39
28th Energy Level
652.10 kJ/mol  
40
635.00 kJ/mol  
99+
29th Energy Level
652.10 kJ/mol  
99+
635.00 kJ/mol  
99+
30th Energy Level
652.00 kJ/mol  
37
635.00 kJ/mol  
40
Electrochemical Equivalent
0.69 g/amp-hr  
99+
3.21 g/amp-hr  
13
Electron Work Function
4.30 eV  
25
3.89 eV  
37
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
41  
99+
101  
17
Electron Configuration
[Kr] 4d4 5s1  
[Rn] 5f13 7s2  
Crystal Structure
Body Centered Cubic (BCC)  
Not Known  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
41  
99+
101  
17
Number of Neutrons
52  
99+
157  
8
Number of Electrons
41  
99+
101  
17
Radius of an Atom
  
  
Atomic Radius
146.00 pm  
37
175.00 pm  
21
Covalent Radius
164.00 pm  
30
175.00 pm  
25
Van der Waals Radius
200.00 pm  
35
246.00 pm  
12
Atomic Weight
92.91 amu  
99+
258.00 amu  
14
Atomic Volume
10.87 cm3/mol  
99+
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Zirconium
  
Fermium
  
Next Element
Molybdenum
  
Nobelium
  
Valence Electron Potential
104.00 (-eV)  
8
63.70 (-eV)  
23
Lattice Constant
330.04 pm  
99+
-  
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.47  
99+
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
8.57 g/cm3  
99+
10.30 g/cm3  
38
Density When Liquid (at m.p.)
8.57 g/cm3  
99+
10.30 g/cm3  
39
Tensile Strength
330.00 MPa  
14
80.00 MPa  
29
Viscosity
0.00  
22
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
16
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
36
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
38.00 GPa  
20
32.00 GPa  
24
Bulk Modulus
170.00 GPa  
10
0.00 GPa  
99+
Young's Modulus
105.00 GPa  
22
12.00 GPa  
99+
Poisson Ratio
0.40  
4
0.30  
14
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
8.57  
99+
13.50  
29
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
4
0.00 H/m  
11
Susceptibility
0.00  
30
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
152.00 nΩ·m  
23
0.63 nΩ·m  
99+
Electrical Conductivity
0.07 106/cm Ω  
33
0.00 106/cm Ω  
99+
Electron Affinity
86.10 kJ/mol  
14
50.00 kJ/mol  
26
Thermal
Specific Heat
0.26 J/(kg K)  
20
0.10 J/(kg K)  
99+
Molar Heat Capacity
24.60 J/mol·K  
99+
27.00 J/mol·K  
29
Thermal Conductivity
53.70 W/m·K  
29
0.00 W/m·K  
99+
Critical Temperature
2,750.00 K  
7
1,100.00 K  
99+
Thermal Expansion
7.30 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
696.60 kJ/mol  
5
380.50 kJ/mol  
26
Enthalpy of Fusion
27.20 kJ/mol  
6
-  
Enthalpy of Atomization
745.00 kJ/mol  
4
410.80 kJ/mol  
25
Standard Molar Entropy
36.40 J/mol.K  
99+
37.40 J/mol.K  
99+
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