Template:Infobox neptunium: Difference between revisions

Neptunium, ₀₀Np
Neptunium
Pronunciation	/nɛpˈtjuːniəm/ (nep-TEW-nee-əm)
Appearance	silvery metallic
Mass number	[237]
Neptunium in the periodic table
	uranium ← neptunium → plutonium
Group	f-block groups (no number)
Period	period 7
Block	f-block
Electron configuration	[Rn] 5f4 6d1 7s2
Electrons per shell	2, 8, 18, 32, 22, 9, 2
Physical properties
Phase at STP	solid
Melting point	910 K (637 °C, 1179 °F)
Boiling point	4273 K (4000 °C, 7232 °F)
Density (near r.t.)	20.45 g/cm3
Heat of fusion	3.20 kJ/mol
Heat of vaporization	336 kJ/mol
Molar heat capacity	29.46 J/(mol·K)
Atomic properties
Oxidation states	common: +5; +2,? +3, +4, +6, +7
Electronegativity	Pauling scale: 1.36
Atomic radius	empirical: 155 pm
Covalent radius	190±1 pm
	Spectral lines of neptunium
Other properties
Natural occurrence	from decay
Crystal structure	3 forms: orthorhombic,; tetragonal and cubic
Thermal conductivity	6.3 W/(m⋅K)
Electrical resistivity	(22 °C) 1.220 µ Ω⋅m
Magnetic ordering	paramagnetic
CAS Number	7439-99-8
Isotopes of neptunium v; e;
ε	235U
β−	236Pu
α	232Pa
	Category: Neptunium; view; talk; edit; \| references

Content deleted Content added

Inline

Revision as of 02:43, 18 June 2012

^ Criticality of a ²³⁷Np Sphere
^ ^a ^b ^c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 28. ISBN 978-0-08-037941-8.
^ 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.
^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

@@ Line 14: / Line 14: @@
 |appearance=silvery metallic
 |atomic mass= (237)
-|electron configuration= &#91;[[radon|Rn]]&#93; 7s<sup>2</sup> 6d<sup>1</sup> 5f<sup>4</sup>
+|electron configuration= &#91;[[radon|Rn]]&#93; 7s<sup>2</sup> 5f<sup>4</sup> 6d<sup>1</sup>
 |electrons per shell= 2, 8, 18, 32, 22, 9, 2
 |phase= solid