Np
Neptunium
Actinide
Neptunium is a silvery radioactive metal and the first transuranium element. It is produced as a byproduct in nuclear reactors.
Key Facts
Atomic Number
93
Atomic Weight
237
State
Solid
Half-life
2.14 million years (Np-237)
Discovered
1940
Edwin McMillan and Philip H. Abelson
Overview
Description
Neptunium is a silvery radioactive metal and the first transuranium element. It is produced as a byproduct in nuclear reactors.
Discovery
Neptunium was discovered in 1940 by Edwin McMillan and Philip H. Abelson.