Atomic NumberAtomic Number of Neptunium
Atomic Number of Neptunium is 93.
Chemical symbol for Neptunium is Np. Number of protons in Neptunium is 93. Atomic weight of Neptunium is 237 u or g/mol. Melting point of Neptunium is 640 °C and its the boiling point is 3902 °C.
» Boiling Point » Melting Point » Abundant » State at STP » Discovery YearAbout Neptunium
Neptunium is a radioactive metal discovered in the middle of the last century and given the name after one of the planets of the Solar System, which was in turn named after the Roman God of the sea, the mighty Neptune. Neptunium is one of the actinides and is a very toxic element. It can be obtained only as a result of chemical reactions in nuclear reactors; however, some traces of this element exist in uranium ores. It plays no biological role and can be very harmful to the living organisms on our planet. This chemical element is mostly received and used in nuclear reactors, mainly just for the purposes related to scientific studies and research.
Properties of Neptunium Element
| Atomic Number (Z) | 93 |
|---|---|
| Atomic Symbol | Np |
| Group | |
| Period | 7 |
| Atomic Weight | 237 u |
| Density | 20.45 g/cm3 |
| Melting Point (K) | 917 K |
| Melting Point (℃) | 640 °C |
| Boiling Point (K) | 4273 K |
| Boiling Point (℃) | 3902 °C |
| Heat Capacity | |
| Abundance | ≤ 3×10−12 mg/kg |
| State at STP | Solid |
| Occurrence | Transient |
| Description | Actinide |
| Electronegativity (Pauling) χ | 1.36 |
| Ionization Energy (eV) | 6.2657 |
| Atomic Radius | 175pm |
| Covalent Radius | no datapm |
| Valence Electrons | 2 |
| Year of Discovery | 1940 |
| Discoverer | McMillan and Abelson |