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| General |
| Name, Symbol, Number | Neptunium, Np, 93 |
| Chemical series | Actinides |
| Group, Period, Block | _ , 7 , f |
| Density, Hardness | 20250 kg/m3, n/a |
| Appearance | silvery |
| Atomic Properties |
| Atomic weight | 237.0482 amu |
| Atomic radius (calc.) | n/a (n/a) pm |
| Covalent radius | n/a pm |
| van der Waals radius | n/a pm |
| Electron configuration | [Rn]7s25f46d1 |
| e- 's per energy level | _ |
| Oxidation states (Oxide) | _ |
| Crystal structure | 3 forms: orthorhombic, tetragonal and cubic |
| Physical Properties |
| State of matter | solid (__) |
| Melting point | _ K (_ °F) |
| Boiling point | _ K (_ °F) |
| Molar volume | _ ×10-3 m3/mol |
| Heat of vaporization | n/a kJ/mol |
| Heat of fusion | _ kJ/mol |
| Vapor pressure | unknown Pa at 1323 K |
| Velocity of sound | unknown m/s at 293.15 K |
| Miscellaneous |
| Electronegativity | _ (Pauling scale) |
| Specific heat capacity | unknown J/(kg*K) |
| Electrical conductivity | unknown 106/m ohm |
| Thermal conductivity | _ W/(m*K) |
| 1st ionization potential | _ kJ/mol |
| 2nd ionization potential | _ kJ/mol |
| 3rd ionization potential | unknown kJ/mol |
| 4th ionization potential | unknown kJ/mol |
| Most Stable Isotopes |
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| SI units & STP are used except where noted. |
Neptunium, also known less commonly as
poseidonium, is a
chemical element, in the
periodic table that has the symbol Np and atom number 93.
Los Alamos National Laboratory's Chemistry Division: Periodic Table - Neptunium
- http://pearl1.lanl.gov/periodic/elements/93.html
See:
Periodic Table
