KnowraNeptuniumLinked fromLinked fromThe 6 pages that link to Neptunium, each with the reason it gives.All 6Broader topic 4Compared with 2PlutoniumCompared with: It precedes plutonium in the actinide series and can be its immediate nuclear precursor.ProtactiniumCompared with: Neptunium lies just beyond protactinium and is generally human-produced rather than naturally abundant.