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Neptunium, 93 Neptunium Pronunciation (nep-TEW -nee-əm Appearance sillery metallic Mass number [237] Neptunium in the periodic cairt
Atomic nummer (Z ) 93 Group group n/a Period period 7 Block f-block Element category Actinide Electron confeeguration [Rn ] 5f4 6d1 7s2 Electrons per shell 2, 8, 18, 32, 22, 9, 2 Pheesical properties Phase at STP solit Meltin pynt 912±3 K (639±3 °C, 1182±5 °F) Bylin pynt 4447 K (4174 °C, 7545 °F) (extrapolatit) Density (near r.t. ) alpha: 20.45 g/cm3 [ 1] 3 Heat o fusion 5.19 kJ/mol Heat o vapourisation 336 kJ/mol Molar heat capacity 29.46 J/(mol·K) Vapour pressur
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
2194
2437
Atomic properties Oxidation states +2, +3, +4,[ 2] +5 amphoteric oxide) Electronegativity Pauling scale: 1.36 Ionisation energies Atomic radius empirical: 155 pm Covalent radius 190±1 pm Colour lines in a spectral range Spectral lines o neptuniumIther properties Creestal structur orthorhombic Thermal conductivity 6.3 W/(m·K) Electrical resistivity 1.220 µΩ·m (at 22 °C) Magnetic orderin paramagnetic [ 3] CAS Nummer 7439-99-8 History Namin efter planet Neptune , itsel named efter Roman god o the sea Neptune Diskivery Edwin McMillan an Philip H. Abelson (1940) Main isotopes o neptunium
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C
639
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K
912
912
0
F
1182
1182
0
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String Module Error: Target string is empty !
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C: 639±3, K: 912±3, F: 1182±5
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in
calc from C
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C
4174
—
—
K
4447
4447
0
F
7545
7545
0
WD
String Module Error: Target string is empty !
input
C: 4174, K: 4447, F: 7545
comment
(extrapolatit)
References
Thir references will appear in the airticle, but this list appears anerly on this page.
↑ 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 237 Np Sphere" (PDF) . Japanese Atomic Energy Agency. Retrieved 6 August 2014 . ↑ 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.
