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{%type%} Definitions

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n. - A radioactive transuranic metallic element.

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Usage examples (34)
  • In this way there was discovered an entirely new radioactive series which, from its most long-lived member, is now called the neptunium family.
  • There are no easy intermediate stages, like the neptunium which is a stage between uranium and plutonium.
  • Here the neptunium series fills a gap with mass numbers of the form 4n + 1.
  • So in four hundred and fifty-eight years -- on average -- it changes to neptunium.
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