Neptunium: historical information

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Neptunium was discovered by Edwin M. McMillan and P. H. Abelson at 1940 in USA. Origin of name: named after "the planet Neptune"

Neptunium was the first synthetic transuranium element of the actinide series. It was discovered by McMillan and Abelson in 1940 at Berkeley, California, USA, who bombarded uranium with neutrons produced from a cyclotron. It was the first synthetic transuranium (elements after uranium) element discovered.

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neptunium atomic number