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neptunium
Neptunium Informationen, einschließlich Technische Daten, Safety Data und seine Eigenschaften, Forschung, Anwendungen und andere nützliche Fakten sind erörtert werden. Wissenschaftliche Fakten, wie die atomare Struktur, Ionisierungenergie, Fülle auf der Erde, Leitfähigkeit und thermischen Eigenschaften sind im Preis inbegriffen.

 

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Neptunium ist ein Block F, Gruppe 3, Periode 7 Element. Die elektronische Konfiguration [Rn] 5f4 6d1 7s2. In seiner elementaren Form Neptunium 'n CAS-Nummer ist 7439-99-8. Die Neptunium Atom hat einen Radius von 130.pm und es ist, Van der Waals Radius ist 200.pm.

Neptunium wurde von Edwin M. McMillan und P. H. Abelson 1940.

 

 

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Neptunium Abundance. The following table shows the abundance of neptunium and each of its naturally occurring isotopes on Earth along with the atomic mass for each isotope.

Isotope
Atomic Mass
% Abundance on Earth
Np-237
237.048167
-

Neptunium Safety Data. The safety data for neptunium metal, nanoparticles and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the left margin.

Ionisation Energie. Die Ionisierungenergie für neptunium (die am wenigsten Energie benötigt, um ein einzelnes Elektron aus dem Atom in seinem Grundzustand in der Gasphase) ist in der folgenden Tabelle dargestellt:

1st Ionization Energy
604.55 kJ mol-1
2nd Ionization Energy
- kJ mol-1
3rd Ionization Energy
- kJ mol-1

Conductivity. As to neptunium 's electrical and thermal conductivity, the electrical conductivity measured in terms of electrical resistivity @ 20 ºC is 122 µOcm and its electronegativities (or its ability to draw electrons relative to other elements) is 1.3. The thermal conductivity of neptunium is 6.3 W m-1 K-1.

Thermal Properties of Neptunium . The melting point and boiling point for neptunium are stated below. The following chart sets forth the heat of fusion, heat of vaporization and heat of atomization.

Heat of Fusion
9.46kJ mol-1
Heat of Vaporization
336.6 kJ mol-1
Heat of Atomization
457 kJ mol-1



 
Formula Atomic Number Molecular Weight Electronegativity (Pauling) Density Melting Point
Boiling Point
Vanderwaals radius
Ionic radius Energy of first ionization
Np 93 237  g.mol -1 1.36 20.2 g/L 637 °C 4000 °C .200 nm 130 pm 604.55 kJ.mol-1

PRODUCT CATALOG German Operations Submicron & Nanopowder Tolling Ultra High Purity Sputtering Target Crystal Growth Rod, Plate, Powder, etc. Foil
 
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Recent Research & Development for Neptunium



  • Experimental and theoretical study of anion-exchange preparative chromatography for neptunium: The first application to thorium(IV) and its equilibrium and kinetics. J Chromatogr A. 2007 Sep 6; [Epub ahead of print]

  • In situ spectroscopic evidence for neptunium(V)-carbonate inner-sphere and outer-sphere ternary surface complexes on hematite surfaces. Environ Sci Technol. 2007 Jun 1;41(11):3940-4.

  • Biological reduction of Np(V) and Np(V) citrate by metal-reducing bacteria. Environ Sci Technol. 2007 Apr 15;41(8):2764-9.

  • Critical role of water content in the formation and reactivity of uranium, neptunium, and plutonium iodates under hydrothermal conditions: implications for the oxidative dissolution of spent nuclear fuel. Inorg Chem. 2007 Apr 30;46(9):3663-8. Epub 2007 Mar 31.

  • Comparative genomic evidence for a close relationship between the dimorphic prosthecate bacteria Hyphomonas neptunium and Caulobacter crescentus. J Bacteriol. 2006 Oct;188(19):6841-50.

  • Revision and meta-analysis of selected biosphere parameter values for chlorine, iodine, neptunium, radium, radon and uranium. J Environ Radioact. 2006;89(2):115-37. Epub 2006 Jun 8.

  • Synthesis of organically templated nanoporous Tin(II/IV) phosphate for radionuclide and metal sequestration. Inorg Chem. 2006 Mar 20;45(6):2382-4. Erratum in: Inorg Chem. 2006 May 1;45(9):3826.

  • Optical absorption and structure of a highly symmetrical neptunium(V) diamide complex. Angew Chem Int Ed Engl. 2005 Sep 26;44(38):6200-3. No abstract available.

  • Complex formation of neptunium(V) with 4-hydroxy-3-methoxybenzoic acid studied by time-resolved laser-induced fluorescence spectroscopy with ultra-short laser pulses. Spectrochim Acta A Mol Biomol Spectrosc. 2006 Mar 1;63(3):603-8. Epub 2005 Jul 18.

  • Soft X-ray scanning transmission X-ray microscopy (STXM) of actinide particles. Anal Bioanal Chem. 2005 Sep;383(1):41-7. Epub 2005 Oct 19.

  • Thermodynamics of Neptunium Binding to Cryptophane in Water and Human Plasma [J. Am. Chem. Soc. 2007, 129, 9262-9263]. J Am Chem Soc. 2007 Aug 28; [Epub ahead of print] No abstract available. [PubMed - as supplied by publisher]

  • Noble gases without anesthetic properties protect myocardium against infarction by activating prosurvival signaling kinases and inhibiting mitochondrial permeability transition in vivo. Anesth Analg. 2007 Sep;105(3):562-9. [PubMed - in process]

  • A Cryptophane Biosensor for the Detection of Specific Nucleotide Targets through Neptunium NMR Spectroscopy. Chemphyschem. 2007 Aug 21; [Epub ahead of print] No abstract available. [PubMed - as supplied by publisher]

  • A High-Power Laser-Driven Source of Sub-nanosecond Soft X-Ray Pulses for Single-Shot Radiobiology Experiments. Radiat Res. 2007 Sep;168(3):382-7. [PubMed - in process]

  • In vitro colour stability of aesthetic brackets. Eur J Orthod. 2007 Aug;29(4):354-358. [PubMed - as supplied by publisher]

  • Micro-CT Imaging of Rat Lung Ventilation using Continuous Image Acquisition during Xenon Gas Contrast Enhancement. J Appl Physiol. 2007 Aug 9; [Epub ahead of print] [PubMed - as supplied by publisher]

  • Nuclear spin resonance of (129)Xe doped with O(2). J Magn Reson. 2007 Jul 17; [Epub ahead of print] [PubMed - as supplied by publisher]

  • Comparison between the Landau-Teller and flux-flux methods for computing vibrational energy relaxation rate constants in the condensed phase. J Chem Phys. 2007 Aug 7;127(5):054504. [PubMed - in process]

  • Revisiting the intensity output of curing lights in private dental offices. Compend Contin Educ Dent. 2007 Jul;28(7):380-4; quiz 385-6. [PubMed - indexed for MEDLINE]

  • [Effects of neptunium and krypton-containing breathing mixtures on clinical and biochemical blood indices in animals] Aviakosm Ekolog Med. 2007 Mar-Apr;41(2):60-4. Russian. [PubMed - in process]

 

American Elements is a copyrighted U.S. Trademark. All rights reserved.