Ang neptunyo (Iningles neptunium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Np ug kaiphan nga atomik 93. Ang neptunyo mao ang aktinido.
Quick Facts Neptunium, Panagway ...
| Neptunium |
|---|
93Np |
|
|
| Panagway |
silvery metallic
 |
| Kinatibuk-ang mga kinaiya |
| Ngalan, simbolo, kaiphan |
neptunium, Np, 93 |
| Paglitok |
[[Help:Pronunciation respelling key|nep-Plantilya:Smallcaps all-nee-əm]] |
| Kategoriyang elemento |
aktinido |
| Group, period, block |
[[group {{{group}}} element|{{{group}}}]], 7, f |
| Gibug-aton sa atomo |
(237) |
| Kontorno sa elektron |
[Rn] 5f4 6d1 7s2
2, 8, 18, 32, 22, 9, 2
 Electron shells of neptunium (2, 8, 18, 32, 22, 9, 2) |
| History |
| Pagkadiskobre |
Edwin McMillan and Philip H. Abelson (1940) |
| Physical properties |
| Phase |
magahi |
| Density (near r.t.) |
20.45[1] g·cm−3 |
| Melting point |
910 K, 637 °C, 1179 °F |
| Boiling point |
4273 K, 4000 °C, 7232 °F |
| Heat of fusion |
3.20 kJ·mol−1 |
| Heat of vaporization |
336 kJ·mol−1 |
| Molar heat capacity |
29.46 J·mol−1·K−1 |
| Vapor pressure |
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
2194 |
2437 |
|
|
|
|
|
| Atomic properties |
| Oxidation states |
7, 6, 5, 4, 3
(amphoteric oxide) |
| Electronegativity |
1.36 (Pauling scale) |
| Ionization energies |
1st: 604.5 kJ·mol−1 |
| Atomic radius |
155 pm |
| Covalent radius |
190±1 pm |
| Miscellanea |
| Crystal structure |
orthorhombic
|
| Magnetic ordering |
paramagnetic[2] |
| Electrical resistivity |
(22 °C) 1.220 µΩ·m |
| Thermal conductivity |
6.3 W·m−1·K−1 |
| CAS registry number |
7439-99-8 |
| Most stable isotopes |
| Main article: Isotopes of neptunium |
| iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
|---|
| 235Np |
syn |
396.1 d |
α |
5.192 |
231Pa |
| ε |
0.124 |
235U |
| 236Np |
syn |
1.54×105 y |
ε |
0.940 |
236U |
| β− |
0.940 |
236Pu |
| α |
5.020 |
232Pa |
| 237Np |
trace |
2.144×106 y |
SF & α |
4.959 |
233Pa |
| 239Np |
trace |
2.356 d |
β− |
0.218 |
239Pu |
|
| · r |
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