Periodic Table of the Elements: Neptunium
Related article: Periodic Table of the Elements (table)Periodic Table of the Elements
(showing atomic number and atomic symbol; click on atomic symbol for more detailed information)
Groups
..... Click the link for more information.
| 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. ..... Click the link for more information. | |
| Atomic Weight: | (237) |
| Electron Configuration: | 2 · 8 · 18 32 · 22 9 · 2 |
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/