Neptunium
Neptunium , including Technical Data, Safety Data and its high purity properties, research, applications and other useful facts are discussed below. Scientific facts such as the atomic structure,ionization energy, abundance on Earth, conductivity and thermal properties are included.|
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Neptunium was discovered by Edwin M. McMillan and P. H. Abelson in 1940.
Neptunium Abundance. The following table shows the abundance of neptunium and each of its naturally occurring isotopes on Earth along with the atomic mass for each isotope.
Neptunium Safety Data. The safety data for neptunium metal, nanoparticles and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the left margin. Neptunium compounds have no biological role. Ionization Energy. The ionization energy for neptunium (the least required energy to release a single electron from the atom in it‘s ground state in the gas phase) is stated in the following table:
Conductivity. As to neptunium ‘s electrical and thermal conductivity, the electrical conductivity measured in terms of electrical resistivity @ 20 ?C is 122 ?Ocm and its electronegativities (or its ability to draw electrons relative to other elements) is 1.3. The thermal conductivity of neptunium is 6.3 W m-1 K-1. Thermal Properties of Neptunium . The melting point and boiling point for neptunium are stated below. The following chart sets forth the heat of fusion, heat of vaporization and heat of atomization.
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| Formula | Atomic Number | Molecular Weight | Electronegativity (Pauling) | Density | Melting Point | Boiling Point | Vanderwaals radius | Ionic radius | Energy of first ionization |
| Np | 93 | 237 g.mol -1 | 1.36 | 20.2 g/L | 637? °C | 4000 °C | .200 nm | 130 pm | 604.55 kJ.mol-1 |