Chemical Element: neptunium

(Modern Latin: named for the planet Neptune, the first planet beyond Uranus; radioactive metal)

Chemical-Element Information

Symbol: Np
Atomic number: 93
Year discovered: 1940

Discovered by: Edwin M. McMillan (born 1907), American physicist, and Philip Hauge Abelson (born 1913) at the University of California in Berkeley.

Neptunium was the first synthetic transuranium element of the actinide series.
It was discovered by McMillan and Abelson in 1940 at Berkeley, California.
They bombarded uranium with neutrons produced from a cyclotron.
The metal is about as malleable as uranium made under the same conditions.

Name in other languages:

French: neptunium

German: Neptunium

Italian: nettunio

Spanish: neptunio

Information about other elements may be seen at this Chemical Elements List.

A special unit about words that include chemo-, chem- may be seen here.

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