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Neptunium Properties
Neptunium


Physical
0
Melting Point
640.00 °C 62
Boiling Point
3,902.00 °C 13
Hardness
0
Mohs Hardness
Not Available 0
Brinell Hardness
Not Available 0
Vickers Hardness
Not Available 0
Optical Properties
0
Refractive Index
Not Available 0
Reflectivity
Not Available 0
Speed of Sound
Not Available 0
Allotropes
No 0
α Allotropes
Not Available 0
β Allotropes
Not Available 0
γ Allotropes
Not Available 0
Chemical
0
Chemical Formula
Np 0
Isotopes
0
Known Isotopes
20 19
Electronegativity
0
Pauling Electronegativity
1.36 29
Sanderson Electronegativity
Not Available 0
Allred Rochow Electronegativity
1.22 26
Mulliken-Jaffe Electronegativity
Not Available 0
Allen Electronegativity
Not Available 0
Electropositivity
0
Pauling Electropositivity
2.64 25
Ionization Energies
0
1st Energy Level
604.50 kJ/mol 50
2nd Energy Level
1,128.00 kJ/mol 72
3rd Energy Level
1,997.00 kJ/mol 74
Electrochemical Equivalent
1.77 g/amp-hr 39
Electron Work Function
Not Available 0
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility 0
Mechanical
0
Density
0
Density At Room Temperature
19.38 g/cm3 14
Density When Liquid (at m.p.)
Not Available 0
Vapor Pressure
0
Vapor Pressure at 1000 K
Not Available 0
Vapor Pressure at 2000 K
0.11 (Pa) 17
Tensile Strength
125.00 MPa 14
Viscosity
Not Available 0
Elasticity properties
0
Shear Modulus
Not Available 0
Bulk Modulus
Not Available 0
Young's Modulus
Not Available 0
Poisson Ratio
Not Available 0
Other Mechanical Properties
Ductile 0
Periodic Table
0
Symbol
Np 0
Group Number
Not Available 0
Period Number
7 1
Block
f block 0
Element Family
Actinide 0
Atomic
0
Atomic Number
93 25
Atomic Weight
237.00 amu 22
Atomic Volume
11.62 cm3/mol 43
Electron Configuration
[Rn] 5f4 6d1 7s2 0
Valence Electron Potential
96.00 (-eV) 9
Atom
0
Number of Protons
93 25
Number of Neutrons
144 14
Number of Electrons
93 25
Crystal Structure
Orthorhombic (ORTH) 0
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100 0
Radius of an Atom
0
Atomic Radius
155.00 pm 30
Covalent Radius
190.00 pm 18
Van der Waals Radius
221.00 pm 22
Lattice Constant
666.30 pm 3
Lattice Angles
π/2, π/2, π/2 0
Lattice C/A Ratio
Not Available 0
Adjacent Atomic Numbers
0
Next Element
26 0
Previous Element
15 0
Magnetic
0
Electrical Properties
0
Resistivity
1.22 nΩ·m 59
Electrical Conductivity
0.01 106/cm Ω 61
Electron Affinity
Not Available 0
Electrical Property
Conductor 0
Magnetic Characteristics
0
Specific Gravity
20.25 6
Magnetic Ordering
Paramagnetic 0
Permeability
Not Available 0
Susceptibility
Not Available 0
Thermal
0
Specific Heat
0.12 J/(kg K) 40
Thermal Conductivity
6.30 W/m·K 70
Critical Temperature
Not Available 0
Molar Heat Capacity
29.46 J/mol·K 8
Thermal Expansion
Not Available 0
Standard Molar Entropy
Not Available 0
Enthalpy
0
Enthalpy of Vaporization
Not Available 0
Enthalpy of Fusion
3.20 kJ/mol 56
Enthalpy of Atomization
Not Available 0
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