Periodic Table:

Element 93 - Neptunium / Neptunium

(Latin / English)

Mass Number

Atomic Mass

% Abundance

Nuclear Spin

237 *

237.0482

0

5/2+

(* = unstable isotope)

Electron Configuration:

[Rn] 5f4 6d1 7s2

Relative Atomic Mass:

237.05

State (25°C, 1 atm):

solid, metal

Density:

20250 kg/m3

Melting Temperature:

913 K

Boiling Temperature:

4175 K

© W. Bauer, 1999