|
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 |
|
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