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Mendelevium vs Neptunium

Mendelevium
Neptunium
Neptunium vs Mendelevium


Periodic Table
Symbol
Md   
Np   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
Block
f block   
f block   
Element Family
Actinide   
Actinide   
CAS Number
7440111   
99+
7439998   
99+
Space Group Name
Not Available   
Pnma   
Space Group Number
Not Available   
62.00   
11
Facts
Interesting Facts
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Not Available   
Sources
Bombarding Einsteinium with Helium Ions   
Made by Bombarding Uranium with Neutrons, Ores of metals   
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory   
Edwin McMillan and Philip H. Abelson   
Discovery
In 1955   
In 1940   
Abundance
  
  
Uses
Uses & Benefits
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
  • 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
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Unknown   
Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
37
In Bone
0.00 p.p.m.   
36
0.00 p.p.m.   
36
Physical Properties
Melting Point
827.00 °C   
99+
640.00 °C   
99+
Boiling Point
Not Available   
3,902.00 °C   
13
Appearance
  
  
Physical State
Solid   
Solid   
Color
Unknown   
Silver   
Luster
Metallic   
Metallic   
Hardness
  
  
Speed of Sound
Not Available   
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
Md   
Np   
Isotopes
  
  
Known Isotopes
16   
23
20   
19
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.36   
29
Allred Rochow Electronegativity
1.20   
27
1.22   
26
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.64   
25
Ionization Energies
  
  
1st Energy Level
635.00 kJ/mol   
99+
604.50 kJ/mol   
99+
2nd Energy Level
1,235.00 kJ/mol   
99+
1,128.00 kJ/mol   
99+
3rd Energy Level
2,470.00 kJ/mol   
99+
1,997.00 kJ/mol   
99+
4th Energy Level
3,840.00 kJ/mol   
99+
3,242.00 kJ/mol   
99+
Electrochemical Equivalent
3.21 g/amp-hr   
12
1.77 g/amp-hr   
39
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
101   
17
93   
25
Electron Configuration
[Rn] 5f13 7s2   
[Rn] 5f4 6d1 7s2   
Crystal Structure
Not Known   
Orthorhombic (ORTH)   
Crystal Lattice
Unknown-Crystal-Structure-of-Mendelevium.jpg#100   
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
Atom
  
  
Number of Protons
101   
17
93   
25
Number of Neutrons
157   
7
144   
14
Number of Electrons
101   
17
93   
25
Radius of an Atom
  
  
Atomic Radius
Not Available   
155.00 pm   
30
Covalent Radius
Not Available   
190.00 pm   
18
Van der Waals Radius
246.00 pm   
8
221.00 pm   
22
Atomic Weight
258.00 amu   
14
237.00 amu   
22
Atomic Volume
Not Available   
11.62 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Fermium
  
Uranium
  
Next Element
Nobelium
  
Plutonium
  
Valence Electron Potential
Not Available   
96.00 (-eV)   
9
Lattice Constant
Not Available   
666.30 pm   
3
Lattice Angles
NA   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
Not Available   
19.38 g/cm3   
14
Tensile Strength
Not Available   
125.00 MPa   
14
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available   
0.11 (Pa)   
17
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Unknown   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available   
20.25   
6
Magnetic Ordering
Unknown   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
Not Available   
1.22 nΩ·m   
99+
Electrical Conductivity
Not Available   
0.01 106/cm Ω   
99+
Thermal Properties
Specific Heat
Not Available   
0.12 J/(kg K)   
40
Molar Heat Capacity
Not Available   
29.46 J/mol·K   
8
Thermal Conductivity
Not Available   
6.30 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
Not Available   
Enthalpy
  
  
Enthalpy of Fusion
Not Available   
3.20 kJ/mol   
99+
Standard Molar Entropy
Not Available   
Not Available   
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