Periodic Table of the Elements: Neptunium

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Periodic Table of the Elements: Neptunium
Atomic Number:93
Atomic Symbol:Np
 Neptuniumneptunium
, radioactive chemical element; symbol Np; at. no. 93; mass number of most stable isotope 237; m.p. about 640°C;; b.p. 3,902°C; (estimated); sp. gr. 20.25 at 20°C;; valence +3, +4, +5, or +6. Neptunium is a ductile, silvery radioactive metal.
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Atomic Weight:(237)
Electron Configuration:2 · 8 · 18 32 · 22 9 · 2
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