| 31. | It is the ninth product of the neptunium decay series as a daughter isotope of actinium-225.
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| 32. | Physicist Philip Abelson, a co-discoverer of neptunium, served as editor from 1962 to 1984.
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| 33. | There are 19 isotopes of neptunium with mass numbers from 225 to 244; they are all highly radioactive.
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| 34. | Since then, most neptunium has been and still is produced by neutron irradiation of uranium in nuclear reactors.
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| 35. | Four atoms of neptunium make up a unit cell, and the Np Np bond lengths are 276 pm.
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| 36. | This occurrence in neptunium compounds is somewhat surprising because they often exhibit strong magnetism, which usually destroys superconductivity.
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| 37. | The U . S . reported on the status of consideration of possible additional controls on americium and neptunium.
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| 38. | As Np also symbolises the element neptunium ( atomic number 93 ) one should use this abbreviation with care.
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| 39. | Following the lighter neptunium, plutonium, and heavier curium, americium was the fourth transuranium element to be discovered.
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| 40. | Plutonium also exhibits valence states between 3 and 7 inclusive, and thus is chemically similar to neptunium and uranium.
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