Neptunium information, 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.
Neptunium is a Block F, Group 3, Period 7 element. The electronic configuration is [Rn] 5f4 6d1 7s2. In its elemental form neptunium 's CAS number is 7439-99-8. The neptunium atom has a radius of 130.pm and it's Van der Waals radius is 200.pm. 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
Neptunium
nettunio
Neptúnio
neptunio
NeptuniumIsotope |
Atomic Mass |
% Abundance on Earth |
Np-237 |
237.048167 |
- |
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.
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: |
1st Ionization Energy |
604.55 kJ mol-1 |
2nd Ionization Energy |
- kJ mol-1 |
3rd Ionization Energy |
- kJ mol-1 |
Conductivity. As to
neptunium 's electrical and thermal conductivity, the electrical conductivity measured in terms of electrical resistivity @
20 ºC is 122 µOcm 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. |
Heat of Fusion |
9.46kJ mol-1 |
Heat of Vaporization |
336.6 kJ mol-1 |
Heat of Atomization |
457 kJ mol-1 |
| 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 |
| PRODUCT CATALOG | U.S. Operations | Submicron & Nanopowder | Tolling | Ultra High Purity | Sputtering Target | Crystal Growth | Rod, Plate, Powder, etc. | Foil |
