neptunium

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Definitions from WordNet

Noun neptunium has 1 sense

neptunium, Np, atomic number 93 - a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
--₁ is a kind of metallic element, metal

Definitions from the Web

Neptunium

Noun:

The chemical element of atomic number 93, a radioactive metal belonging to the actinide series.

Sample Sentence:

"Neptunium is a synthetic element that was first produced by Edwin McMillan and Philip H. Abelson in 1940."

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