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Neptunium Mendelevium Comparison

Neptunium
Mendelevium
Mendelevium Neptunium comparison


Periodic Table
Symbol
Np   
Md   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
Block
f block   
f block   
Element Family
Actinide   
Actinide   
CAS Number
7439998   
99+
7440111   
99+
Space Group Name
Pnma   
Not Available   
Space Group Number
62.00   
11
Not Available   
Facts
Interesting Facts
Not Available   
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals   
Bombarding Einsteinium with Helium Ions   
History
  
  
Who Discovered
Edwin McMillan and Philip H. Abelson   
Lawrence Berkeley National Laboratory   
Discovery
In 1940   
In 1955   
Abundance
  
  
Uses
Uses & Benefits
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
NA   
Biological Properties
  
  
Toxicity
Toxic   
Unknown   
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
640.00 °C   
99+
827.00 °C   
99+
Boiling Point
3,902.00 °C   
13
Not Available   
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Unknown   
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
Np   
Md   
Isotopes
  
  
Known Isotopes
20   
19
16   
23
Electronegativity
  
  
Pauling Electronegativity
1.36   
29
1.30   
32
Allred Rochow Electronegativity
1.22   
26
1.20   
27
Electropositivity
  
  
Pauling Electropositivity
2.64   
25
2.70   
22
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol   
99+
635.00 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
1,235.00 kJ/mol   
99+
3rd Energy Level
1,997.00 kJ/mol   
99+
2,470.00 kJ/mol   
99+
4th Energy Level
3,242.00 kJ/mol   
99+
3,840.00 kJ/mol   
99+
Electrochemical Equivalent
1.77 g/amp-hr   
39
3.21 g/amp-hr   
12
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
93   
25
101   
17
Electron Configuration
[Rn] 5f4 6d1 7s2   
[Rn] 5f13 7s2   
Crystal Structure
Orthorhombic (ORTH)   
Not Known   
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
Unknown-Crystal-Structure-of-Mendelevium.jpg#100   
Atom
  
  
Number of Protons
93   
25
101   
17
Number of Neutrons
144   
14
157   
7
Number of Electrons
93   
25
101   
17
Radius of an Atom
  
  
Atomic Radius
155.00 pm   
30
Not Available   
Covalent Radius
190.00 pm   
18
Not Available   
Van der Waals Radius
221.00 pm   
22
246.00 pm   
8
Atomic Weight
237.00 amu   
22
258.00 amu   
14
Atomic Volume
11.62 cm3/mol   
99+
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Uranium
  
Fermium
  
Next Element
Plutonium
  
Nobelium
  
Valence Electron Potential
96.00 (-eV)   
9
Not Available   
Lattice Constant
666.30 pm   
3
Not Available   
Lattice Angles
π/2, π/2, π/2   
NA   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
19.38 g/cm3   
14
Not Available   
Tensile Strength
125.00 MPa   
14
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.11 (Pa)   
17
Not Available   
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Ductile   
Unknown   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
20.25   
6
Not Available   
Magnetic Ordering
Paramagnetic   
Unknown   
Electrical Properties
  
  
Electrical Property
Conductor   
Unknown   
Resistivity
1.22 nΩ·m   
99+
Not Available   
Electrical Conductivity
0.01 106/cm Ω   
99+
Not Available   
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
Not Available   
Molar Heat Capacity
29.46 J/mol·K   
8
Not Available   
Thermal Conductivity
6.30 W/m·K   
99+
Not Available   
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
Not Available   
Enthalpy
  
  
Enthalpy of Fusion
3.20 kJ/mol   
99+
Not Available   
Standard Molar Entropy
Not Available   
Not Available   
Summary >>
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