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Atomic symbol - Np
Atomic weight - (237.0482)
Atomic number - 93
Electron configuration - 2-8-18-32-22-9-2
Oxidation states - +3, +4, +5, +6
State of matter - synthetic
Heavy metal-ductile
Discovered in 1940 by Edwin M. McMillan and Philip H. Abelson
Boils at unknown, melts at 640 .C

Notes:
Neptunium is a radioactive element. It has a silvery color. It exists in
three crystalline modifications; the alpha form is orthorhombic.

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