1. Ions of neptunium are prone to hydrolysis and formation of coordination compounds. 2. ?-neptunium takes on a distorted tetragonal close-packed structure. 3. Neptunium also forms a wide variety of fluoride compounds with various elements.4. One neptunium -bismuth compound, NpBi, has also been reported. 5. Like plutonium, neptunium has a high affinity for soil. 6. The element 93 was synthesised in 1940 and named neptunium . 7. Neptunium is a metal and a byproduct of uranium.8. It identifies the sources of the radiation as uranium, plutonium and neptunium . 9. Astatine-217 is produced via the radioactive decay of neptunium -237. 10. Not as much work has been done to characterize neptunium in basic solutions. 
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