Home / Elements / Neptunium
93 Np [237] u
Neptunium
Actinide
Atomic no.93
Atomic mass[237] u
Period7
Group7
Phase (25°C)Solid
Discovered1940
Did you knowFirst transuranium element discovered
Element photos
Loading HD photos…
Ask AI about Neptunium
Powered by Claude AI · Ask about uses, history, reactions, fun facts
← Previous Uranium Element 92 Next → Plutonium Element 94