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Mendelevium vs Hafnium

Mendelevium
Hafnium
Hafnium vs Mendelevium


Periodic Table
Symbol
Md   
Hf   
Group Number
Not Available   
4   
14
Period Number
7   
6   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440111   
99+
7440586   
30
Space Group Name
Not Available   
P63/mmc   
Space Group Number
Not Available   
194.00   
5
Facts
Interesting Facts
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
Sources
Bombarding Einsteinium with Helium Ions   
By-product Zirconium Refining   
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory   
Dirk Coster and George de Hevesy   
Discovery
In 1955   
In 1922   
Abundance
  
  
Abundance In Universe
Not Available   
7 * 10-8 %   
25
Abundance In Sun
~-9999 %   
~0.0000001 %   
26
Abundance In Meteorites
Not Available   
0.00 %   
37
Abundance In Earth's Crust
Not Available   
0.00 %   
31
Abundance In Oceans
Not Available   
0.00 %   
27
Uses
Uses & Benefits
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
  • It has an ability to absorb neutrons and hence it is used to make control rods in nuclear submarines. And this metal is also used in Plasma welding torches.
  • It alloys with iron, titanium and niobium are very useful.
  
Industrial Uses
NA   
Ammunition Industry   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Unknown   
Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
In Bone
0.00 p.p.m.   
36
Not Available   
Physical Properties
Melting Point
827.00 °C   
99+
2,150.00 °C   
10
Boiling Point
Not Available   
5,400.00 °C   
5
Appearance
  
  
Physical State
Solid   
Solid   
Color
Unknown   
Gray   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
5.50   
7
Brinell Hardness
Not Available   
1,450.00 MPa   
6
Vickers Hardness
Not Available   
1,520.00 MPa   
5
Speed of Sound
Not Available   
3,010.00 m/s   
27
Optical Properties
  
  
Allotropes
No   
No   
α Allotropes
Not Available   
Not Available   
β Allotropes
Not Available   
Not Available   
γ Allotropes
Not Available   
Not Available   
Chemical Properties
Chemical Formula
Md   
Hf   
Isotopes
  
  
Known Isotopes
16   
23
32   
7
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.30   
32
Allred Rochow Electronegativity
1.20   
27
1.23   
25
Allen Electronegativity
Not Available   
1.16   
37
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.70   
22
Ionization Energies
  
  
1st Energy Level
635.00 kJ/mol   
99+
658.50 kJ/mol   
40
2nd Energy Level
1,235.00 kJ/mol   
99+
1,440.00 kJ/mol   
99+
3rd Energy Level
2,470.00 kJ/mol   
99+
2,250.00 kJ/mol   
99+
4th Energy Level
3,840.00 kJ/mol   
99+
3,216.00 kJ/mol   
99+
Electrochemical Equivalent
3.21 g/amp-hr   
12
1.66 g/amp-hr   
99+
Electron Work Function
Not Available   
3.90 eV   
27
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
101   
17
72   
99+
Electron Configuration
[Rn] 5f13 7s2   
[Xe] 4f14 5d2 6s2   
Crystal Structure
Not Known   
Hexagonal Close Packed (HCP)   
Crystal Lattice
Unknown-Crystal-Structure-of-Mendelevium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
101   
17
72   
99+
Number of Neutrons
157   
7
106   
29
Number of Electrons
101   
17
72   
99+
Radius of an Atom
  
  
Atomic Radius
Not Available   
159.00 pm   
28
Covalent Radius
Not Available   
175.00 pm   
23
Van der Waals Radius
246.00 pm   
8
200.00 pm   
28
Atomic Weight
258.00 amu   
14
178.49 amu   
39
Atomic Volume
Not Available   
13.60 cm3/mol   
38
Adjacent Atomic Numbers
  
  
Previous Element
Fermium
  
Lutetium
  
Next Element
Nobelium
  
Tantalum
  
Valence Electron Potential
Not Available   
81.00 (-eV)   
16
Lattice Constant
Not Available   
319.64 pm   
99+
Lattice Angles
NA   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.58   
12
Mechanical Properties
Density
  
  
Density At Room Temperature
Not Available   
13.31 g/cm3   
26
Density When Liquid (at m.p.)
Not Available   
12.00 g/cm3   
12
Tensile Strength
Not Available   
445.00 MPa   
8
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available   
0.00 (Pa)   
24
Elasticity properties
  
  
Shear Modulus
Not Available   
30.00 GPa   
23
Bulk Modulus
Not Available   
110.00 GPa   
15
Young's Modulus
Not Available   
78.00 GPa   
25
Poisson Ratio
Not Available   
0.37   
7
Other Mechanical Properties
Unknown   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available   
13.31   
18
Magnetic Ordering
Unknown   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
Not Available   
331.00 nΩ·m   
14
Electrical Conductivity
Not Available   
0.03 106/cm Ω   
39
Electron Affinity
Not Available   
0.00 kJ/mol   
40
Thermal Properties
Specific Heat
Not Available   
0.14 J/(kg K)   
37
Molar Heat Capacity
Not Available   
25.73 J/mol·K   
36
Thermal Conductivity
Not Available   
23.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
5.90 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
661.10 kJ/mol   
5
Enthalpy of Fusion
Not Available   
25.10 kJ/mol   
8
Enthalpy of Atomization
Not Available   
703.00 kJ/mol   
5
Standard Molar Entropy
Not Available   
43.60 J/mol.K   
34
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