Template:Infobox neptunium

[[Category:Template:Pagetype with short description]]

Neptunium, ₉₃Np

File:Np sphere.jpg
Neptunium
Pronunciation	/nɛpˈtjuːniəm/ ​(Template:Respell)
Appearance	silvery metallic
Mass number	[237]
Neptunium in the periodic table
Template:Periodic table (32 columns, micro) Pm ↑ Np ↓ (Uqs) uranium ← neptunium → plutonium
Atomic number (Z)	93
Group	group n/a
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	912±3 K ​(639±3 °C, ​1182±5 °F)
Boiling point	4447 K ​(4174 °C, ​7545 °F) (extrapolated)
Density (near r.t.)	alpha: 20.45 g/cm3 accepted standard value: 19.38 g/cm3
Heat of fusion	5.19 kJ/mol
Heat of vaporization	336 kJ/mol
Molar heat capacity	29.46 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2194 2437
Atomic properties
Oxidation states	+2, +3, +4, +5, +6, +7 (an amphoteric oxide)
Electronegativity	Pauling scale: 1.36
Ionization energies	1st: 604.5 kJ/mol
Atomic radius	empirical: 155 pm
Covalent radius	190±1 pm
Color lines in a spectral range Spectral lines of neptunium
Other properties
Natural occurrence	from decay
Crystal structure	​orthorhombic Orthorhombic crystal structure for neptunium
Thermal conductivity	6.3 W/(m·K)
Electrical resistivity	1.220 µΩ·m (at 22 °C)
Magnetic ordering	paramagnetic
CAS Number	7439-99-8
History
Naming	after planet Neptune, itself named after Roman god of the sea Neptune
Discovery	Edwin McMillan and Philip H. Abelson (1940)
Main isotopes of neptunium
[[Isotope|IsoTemplate:Shytope]] [[Natural abundance|AbunTemplate:Shydance]] Half-life (t1/2) Decay mode [[Decay product|ProTemplate:Shyduct]] 235Np syn 396.1 d α 231Pa ε 235U 236Np syn 1.54×105 y ε 236U β− 236Pu α 232Pa 237Np trace 2.144×106 y α 233Pa 239Np trace 2.356 d β− 239Pu

[[Category:Infobox templates|Template:Remove first word]]

Np Template:Wikidata data m.p. cat
	in	calc from C	diff	report	ref
C	639	—	—
K	912	912	0
F	1182	1182	0		Template:Subpage other
max precision	0
WD	Template:Wikidata				Template:Wikidata
input	C: 639±3, K: 912±3, F: 1182±5
comment

Np Template:Wikidata data b.p. cat
	in	calc from C	diff	report	ref
C	4174	—	—
K	4447	4447	0
F	7545	7545	0		Template:Subpage other
max precision	0
WD	Template:Wikidata				Template:Wikidata
input	C: 4174, K: 4447, F: 7545
comment	(extrapolated)

PTNeptunium

U ← i'box U	iso 93Np () infobox () isobox	→ Pu i'box Pu
Commons Commons Wikidata Wikidata:Q1105 Wiktionary Wiktionary Indexes in PT: § below · Page

Data sets read by {{Infobox element}}
Name and identifiers
Top image (caption, alt)
Pronunciation
Category (enwiki)
Standard atomic weight
most stable isotope
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Term symbol * (cmt, ref)
Wikidata *
* Not used in {{Infobox element}} (2019-02-03) See also {{Infobox element/symbol-to--navbox}}

References

These references will appear in the article, but this list appears only on this page.