| 21. | Plutonium, neptunium, iodine and technetium decay much more slowly and are not strong emitters.
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| 22. | He said neptunium posed a greater danger simply because there was so much more of it.
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| 23. | Neptunium has valence states from 3 to 7, which can be simultaneously observed in solutions.
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| 24. | Another unique trait of neptunium dioxide is its " mysterious low-temperature ordered phase ".
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| 25. | Thus neptunium is present in nature in negligible amounts produced as intermediate decay products of other isotopes.
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| 26. | Plutonium, neptunium and americium form two basic oxides : An 2 O 3 and AnO 2.
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| 27. | Neptunium trioxide is unstable; thus, only Np 3 O 8 could be obtained so far.
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| 28. | Two neptunium chlorides, NpI 3 has also been prepared by the same method as NpBr 3.
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| 29. | In nuclear reactors, neptunium dioxide can also be used as the target metal for plutonium bombardment.
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| 30. | The plutonium and neptunium arrived at Paducah in contaminated shipments of uranium from other bomb-making facilities.
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