A radioactive chemical element of the actinide series, atomic no. 93, which is a silvery metal and was first produced artificially as a product of…
| 单词 | θ68893 |
| 释义 | the world > matter > chemistry > elements and compounds > metals > specific elements > neptunium > [noun] (1) neptunium1941 A radioactive chemical element of the actinide series, atomic no. 93, which is a silvery metal and was first produced artificially as a product of… |
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