title: Neptunium
text: Neptunium () iku unsur kimia kanthi simbul Np lan nomer atom 93.
  
  Rujukan 
  
   Los Alamos National Laboratory's Chemistry Division: Periodic Table - Neptunium 
   Guide to the Elements - Revised Edition, Albert Stwertka, (Oxford University Press; 1998) ISBN 0-19-508083-1
  
  Pranala njaba 
  
   WebElements.com - Neptunium (also used as a reference)
   Lab builds world's first neptunium sphere , U.S. Department of Energy Research News
   NLM Hazardous Substances Databank – Neptunium, Radioactive
  
  Aktinida
  Unsur kimia
  Neptunium
  Èlemèn sintètis