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Neptunium (Np)
Element with atomic number 93, category: Actinide, a solid at room temperature.
Element 93 of 118
Actinide
Neptunium
Group 7, Period 7 (actinide series)
Common Uses
Radioactive
Electron Diagram
About Neptunium
Neptunium is a chemical element with the symbol Np and atomic number 93, meaning every atom has 93 protons in its nucleus. It is classed as Actinide and is a solid at room temperature. Its atomic mass is about 237 atomic mass units (u).
On the periodic table, Neptunium sits in group 7, period 7 (actinide series), which determines how many electron shells it has and how it tends to react with other elements.
Uses of Neptunium
In daily life and industry, Neptunium is used for Radioactive. These uses are closely tied to the typical properties of elements in the Actinide category.
Electron Structure of Neptunium
Using a simplified electron shell model (at most 2 electrons in the first shell, 8 in the second, 18 in the third, and so on), Neptunium has 6 electron shells, with an approximate arrangement of 2, 8, 18, 32, 32, 1 electrons from the innermost shell to the outermost. This is a simplified learning model, not the full electron configuration that accounts for the s, p, d and f subshells.
Explore Other Elements
Want to see another element or try the element symbol quiz? Go back to the Interactive Periodic Table to explore all 118 chemical elements.