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Neodymium vs Mendelevium

Neodymium
Mendelevium
Mendelevium vs Neodymium


Periodic Table
Symbol
Nd   
Md   
Group Number
1   
17
Not Available   
Period Number
6   
7   
Block
f block   
f block   
Element Family
Lanthanide   
Actinide   
CAS Number
7440008   
99+
7440111   
99+
Space Group Name
P63/mmc   
Not Available   
Space Group Number
194.00   
5
Not Available   
Facts
Interesting Facts
  • Neodymium is not found free in nature, hence it is not a native metal.
  • Neodymium metal found in minerals like Monazite and Bastnaesite.
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Found in Minerals, Mining   
Bombarding Einsteinium with Helium Ions   
History
  
  
Who Discovered
Carl Auer von Welsbach   
Lawrence Berkeley National Laboratory   
Discovery
In 1885   
In 1955   
Abundance
  
  
Abundance In Universe
1 * 10-6 %   
16
Not Available   
Abundance In Sun
~0.0000003 %   
24
~-9999 %   
Abundance In Meteorites
0.00 %   
30
Not Available   
Abundance In Earth's Crust
0.00 %   
20
Not Available   
Abundance In Oceans
0.00 %   
30
Not Available   
Uses
Uses & Benefits
  • Neodymium-Iron-boron alloy is used to make permanent magnets.
  • It is used in microphones, Mp3 player, loudspeakers, mobile phones, etc.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
Aerospace Industry, Electrical Industry, Electronic Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys   
NA   
Biological Properties
  
  
Toxicity
Non Toxic   
Unknown   
Present in Human Body
No   
No   
In Blood
Not Available   
0.00 Blood/mg dm-3   
37
In Bone
Not Available   
0.00 p.p.m.   
36
Physical Properties
Melting Point
1,010.00 °C   
99+
827.00 °C   
99+
Boiling Point
3,127.00 °C   
28
Not Available   
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Unknown   
Luster
Metallic   
Metallic   
Hardness
  
  
Brinell Hardness
265.00 MPa   
35
Not Available   
Vickers Hardness
345.00 MPa   
27
Not Available   
Speed of Sound
2,330.00 m/s   
38
Not Available   
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
Nd   
Md   
Isotopes
  
  
Known Isotopes
30   
9
16   
23
Electronegativity
  
  
Pauling Electronegativity
1.14   
99+
1.30   
32
Allred Rochow Electronegativity
1.07   
32
1.20   
27
Electropositivity
  
  
Pauling Electropositivity
2.86   
13
2.70   
22
Ionization Energies
  
  
1st Energy Level
533.10 kJ/mol   
99+
635.00 kJ/mol   
99+
2nd Energy Level
1,040.00 kJ/mol   
99+
1,235.00 kJ/mol   
99+
3rd Energy Level
2,130.00 kJ/mol   
99+
2,470.00 kJ/mol   
99+
4th Energy Level
3,900.00 kJ/mol   
99+
3,840.00 kJ/mol   
99+
Electrochemical Equivalent
1.79 g/amp-hr   
37
3.21 g/amp-hr   
12
Electron Work Function
3.20 eV   
34
Not Available   
Other Chemical Properties
Chemical Stability, Corrosion, Flammable, Ionization   
Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
60   
99+
101   
17
Electron Configuration
[Xe] 4f4 6s2   
[Rn] 5f13 7s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Not Known   
Crystal Lattice
DHCP-Crystal-Structure-of-Neodymium.jpg#100   
Unknown-Crystal-Structure-of-Mendelevium.jpg#100   
Atom
  
  
Number of Protons
60   
99+
101   
17
Number of Neutrons
84   
40
157   
7
Number of Electrons
60   
99+
101   
17
Radius of an Atom
  
  
Atomic Radius
181.00 pm   
13
Not Available   
Covalent Radius
201.00 pm   
10
Not Available   
Van der Waals Radius
229.00 pm   
20
246.00 pm   
8
Atomic Weight
144.24 amu   
99+
258.00 amu   
14
Atomic Volume
20.60 cm3/mol   
18
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Praseodymium
  
Fermium
  
Next Element
Promethium
  
Nobelium
  
Valence Electron Potential
43.40 (-eV)   
99+
Not Available   
Lattice Constant
365.80 pm   
30
Not Available   
Lattice Angles
π/2, π/2, 2 π/3   
NA   
Lattice C/A Ratio
1.61   
4
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
7.01 g/cm3   
99+
Not Available   
Density When Liquid (at m.p.)
6.89 g/cm3   
36
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
21
Not Available   
Vapor Pressure at 2000 K
101.00 (Pa)   
2
Not Available   
Elasticity properties
  
  
Shear Modulus
16.30 GPa   
38
Not Available   
Bulk Modulus
31.80 GPa   
37
Not Available   
Young's Modulus
41.40 GPa   
40
Not Available   
Poisson Ratio
0.28   
16
Not Available   
Other Mechanical Properties
NA   
Unknown   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
7.00   
99+
Not Available   
Magnetic Ordering
Paramagnetic   
Unknown   
Electrical Properties
  
  
Electrical Property
NA   
Unknown   
Resistivity
643.00 nΩ·m   
6
Not Available   
Electrical Conductivity
0.02 106/cm Ω   
99+
Not Available   
Electron Affinity
50.00 kJ/mol   
21
Not Available   
Thermal Properties
Specific Heat
0.19 J/(kg K)   
32
Not Available   
Molar Heat Capacity
27.45 J/mol·K   
17
Not Available   
Thermal Conductivity
16.50 W/m·K   
99+
Not Available   
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
9.60 µm/(m·K)   
99+
Not Available   
Enthalpy
  
  
Enthalpy of Vaporization
273.00 kJ/mol   
34
Not Available   
Enthalpy of Fusion
7.14 kJ/mol   
99+
Not Available   
Enthalpy of Atomization
322.00 kJ/mol   
32
Not Available   
Standard Molar Entropy
71.50 J/mol.K   
13
Not Available   
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