| Element (Atom) Name | Neptunium |
| Symbol | Np |
| Physical state at room temperature | Solid |
| Element Classification | Metal |
| Group Name | Actinide |
| Period Number (Periodic table) | 7 |
| Group number (Periodic table) | None |
| Atomic number | 93 |
| Atomic weight | 237 (Ref: Jlab-ele093, Lanl-93, Nist-93) |
| Atomic Radius | 221 pm (Van der Waals) (Ref: Lanl-93) |
| Density | 20.25 g/cm3 (Ref: Jlab-ele093) |
| Melting point | 644°C (Ref: Jlab-ele093, Lanl-93) |
| Boiling point | 3902°C (Ref: Jlab-ele093) 4174 °C (Ref: Lanl-93) |
| Electron shell configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f4 6s2 6p6 6d1 7s2 |
| Oxidation States | +6, +5, +4, +3 (Ref: Jlab-ele093) 7, 6, 5, 4, 3, 2 (Ref: Lanl-93) |
| Ionization Energy | 6.266 eV (Ref: Jlab-ele093) 6.26554 eV (Ref: Nist-93) |
| Number of Stable Isotopes | 0 |
| InChI | InChI=1S/Np |
| InChI Key | LFNLGNPSGWYGGD-UHFFFAOYSA-N |
| Remarks | Radioactive, Artificially Produced |
REFERENCES
- Jlab-ele093: https://education.jlab.org/itselemental/ele093.html
- Lanl-93: https://periodic.lanl.gov/93.shtml
- ciaaw-atomic-weights: https://www.ciaaw.org/atomic-weights.htm
- Nist-93: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=93
- Pubchem-93: https://pubchem.ncbi.nlm.nih.gov/element/93
- science.co.il: https://www.science.co.il/elements/
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