Neptunium trifluoride is an intermediate for the preparation of
neptunium metal.
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Neptunium is a metal.
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Neptunium has not a smell.
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Neptunium is an individual element; isotopes of neptunium are not separated.
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Neptunium 237 is not a natural occurring isotope; all the
isotopes of neptunium are artificially obtained. The new isotope
formed by decay of Np 237 is protactinium 233.