Neptunium Element Properties

Neptunium

f92
U
Uranium
f93
Np
Neptunium
f94
Pu
Plutonium
General
Name(Neptunium)
Symbol(Np)
Number(93)
Group Number(NA)
Group(Rare Earth, Actinides)
Block(f)
Density(20.45 g/cm3)
Atomic Weight(237.0482 g/mol)
Atomic Volume(11.62 cm3/mol)
Discover(1940)


States
State(Solid)
Melting Point(910 K)
Boiling Point(4273 K)
Triple Point(Nil)
Critical Point(Nil)
Heat of Fusion(3.20 kJ/mol)
Heat of Vaporization(336 kJ/mol)


Energies
First Ionization Energy(597 kJ/mole)
Second Ionization Energy(Nil)
Third Ionization Energy(Nil)
Electronegativity(1.3)
Electron Affinity(Nil)
Specific Heat(0.12 J/gK)
Heat Atomization(Nil)


Oxidation and Electrons
Shells(2,8,18,32,23,8,2)
Electron Configuration([Rn] 5f4 6d1 7s2)
Minimum Oxidation Number(0)
Maximum Oxidation Number(7)
Minimum Common Oxidation Number(0)
Maximum Common Oxidation Number(5)


Appearance and Characteristics
Crystal Structure(3 forms: orthorhombic, tetragonal and cubic)
Characteristics(Radioactive)
Color(silvery)
Uses(Nil)
Hardness(Nil)
Toxicity(None)


Reactions
Reaction with Air(None)
Reaction with 6M HCl(None)
Reaction with 15M HNO3(None)
Reaction with 6M NaOH(None)


Other Forms
Number of Isotopes(0)
Hydride(NpH2 NpH3)
Oxide(NpO NpO2 Np2O5)
Chloride(NpCl3 NpCl4)


Radius
Atomic Radius(155 pm)
Ionic Radius (1+ ion)(Nil)
Ionic Radius (1- ion)(Nil)
Ionic Radius (2+ ion)(124 pm)
Ionic Radius (2- ion)(Nil)
Ionic Radius (3+ ion)(115 pm)


Conductivity
Thermal Conductivity(6.3 J/m-sec-deg)
Electrical Conductivity(Nil)
Polarizability(24.8 A3)


Abundance
Source(Synthetic)
Relation Abundance Solar System(Nil)
Abundance Earths Crust(Nil)


f92
U
Uranium
f93
Np
Neptunium
f94
Pu
Plutonium

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