Néptunium

Néptunium, ₉₃Np
Néptunium; neptuniyum·
Pabaosan	/nɛpˈtjuːniəm/ (nep-TEW-nee-əm)
Cingakan	silvery metallic
Nomor massa	[237]
Néptunium ring tabél périodik
	uranium ← néptunium → plutonium
Wilangan atom (Z)	93
Watek	n/a
Période	période 7
Blok	blok-f
Konpigurasi éléktron	[Rn] 5f4 6d1 7s2
Éléktron per kulit	2, 8, 18, 32, 22, 9, 2
Cecirén pisik
Pase ring STP	padet
Titik lebur	912±3 K (639±3 °C, 1182±5 °F)
Titik didih	4447 K (4174 °C, 7545 °F) (extrapolated)
Kapadetan (nampek s.r.)	alpha: 20.45 g/cm3 ; accepted standard value: 19.38 g/cm3
Panes fusi	5.19 kJ/mol
Panes panguapan	336 kJ/mol
Kapasitas panes molar	29.46 J/(mol·K)
Cecirén atom
Paindikan oksidasi	+2, +3, +4, +5, +6, +7 (oksida ampotér)
Kaéléktronégatipan	skala Pauling: 1.36
Wasa ionisasi	ka-1: 604.5 kJ/mol ; ;
Jeriji atom	émpiris: 155 pm
Jeriji kovalén	190±1 pm
	Garis spéktral saking néptunium
Cecirén liyanan
Struktur kristal	ortorombus
Konduktivitas térmal	6.3 W/(m⋅K)
Resistivitas listrik	1.220 µΩ⋅m (at 22 °C)
bacakan magnétik	paramagnetic
Nomor CAS	7439-99-8
Lelintihan
Pangaranan	saking planét Néptunus, punika kaparinamain saking déwa segara Romawi Néptunus
Panemuan	Edwin McMillan miwah Philip H. Abelson (1940)
Isotop utama néptunium
ε	235U
β−	236Pu
α	232Pa
	Kategori:Néptunium; cingak; pabligbagan; uah; \| pustaka

Néptunium silih tunggil datu kimia antuk simbol Np miwah wilangan atom 93. Logam radioaktip aktinida, néptunium miwah datu transuranik kapertama. Genah nyané ring tabél périodik tepat sesampun uranium, kaaranin mawit planét Uranus, mawinan Neptunus, planét sesampun jaba sisi Uranus. Satunggal atom néptunium ngelah 93 proton miwah 93 éléktron, pitu riantara nyané éléktron valénsi. Logam Néptunium mawarna pérak miwah pangotor ri kala keni udara. Datu kawéntenan ring tiga rupa alotropik miwah ketah nyané nganikayang lima paindikan oksidasi, kakawitin saking +3 nganti +7. Punika radioaktip, nubain, piroforik, miwah prasida kaakumulasi ring balung, sané ngardi pangopénan néptunium mabaya.

PustakaUah

↑ Sanchez, Rene G.; Loaiza, David J.; Kimpland, Robert H.; Hayes, David K.; Cappiello, Charlene C.; Myers, William L.; Jaegers, Peter J.; Clement, Steven D.; Butterfield, Kenneth B. "Criticality of a ²³⁷Np Sphere" (PDF). Japanese Atomic Energy Agency. Kaaksés 2014-08-06.
↑ Np(II), (III) and (IV) have been observed, see Dutkiewicz, Michał S.; Apostolidis, Christos; Walter, Olaf; Arnold, Polly L (2017). "Reduction chemistry of neptunium cyclopentadienide complexes: from structure to understanding". Chem. Sci. 8 (4): 2553–2561. doi:10.1039/C7SC00034K. PMC 5431675. PMID 28553487.
↑ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.

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