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| Ìfarahàn |
silvery metallic
 |
| Àwọn ìní àníkárí |
| Orúkọ, àmì-ìdámọ̀, nọ́mbà |
neptunium, Np, 93 |
| Ìpè |
/nɛpˈtjuːniəm/
nep-TEW-nee-əm |
| Ẹ̀ka apilẹ̀sẹ̀ |
actinide |
| Àdìpọ̀, ìgbà, block |
n/a, 7, f |
| Ìwúwo átọ́mù |
(237) g·mol−1 |
| Ìtòjọ ẹ̀lẹ́ktrónì |
[Rn] 7s2 6d1 5f4 |
| Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan |
2, 8, 18, 32, 22, 9, 2 (Image) |
| Àwọn ìní aláfójúrí |
| Phase |
solid |
| Kíki (tó súnmọ́ r.t.) |
20.45 [1] g·cm−3 |
| ojúàmì ìyọ́ |
910 K, 637 °C, 1179 °F |
| ajúàmì ìhó |
4273 K, 4000 °C, 7232 °F |
| Heat of fusion |
3.20 kJ·mol−1 |
| Heat of vaporization |
336 kJ·mol−1 |
| Specific heat capacity |
(25 °C) 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 |
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| 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 note |
3 forms: orthorhombic,
tetragonal and cubic |
| Magnetic ordering |
paramagnetic[2] |
| Electrical resistivity |
(22 °C) 1.220 µΩ·m |
| Thermal conductivity |
(300 K) 6.3 W·m−1·K−1 |
| CAS registry number |
7439-99-8 |
| Most stable isotopes |
| Main article: Isotopes of neptunium |
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Nẹ́ptúníọ̀m tabi Neptunium je apilese kemika pelu ami-idamo Np ati nomba atomu 93.
