Neptunium

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Neptunium,  93Np
Neptunium2.jpg
General properties
Appearancesillery metallic
Mass nummer237 (most stable isotope)
Neptunium in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
Pm

Np

(Uqp)
uraniumneptuniumplutonium
Atomic nummer (Z)93
Groupgroup n/a
Periodperiod 7
Element category  actinide
Blockf-block
Electron confeeguration[Rn] 5f4 6d1 7s2
Electrons per shell
2, 8, 18, 32, 22, 9, 2
Pheesical properties
Phase (at STP)solit
Meltin pynt912±3 K ​(639±3 °C, ​1182±5 °F)
Bylin pynt4447 K ​(4174 °C, ​7545 °F) (extrapolatit)
Density (near r.t.)alpha: 20.45 g/cm3[1]
acceptit staundart value: 19.38 g/cm3
Heat o fusion5.19 kJ/mol
Heat o vapourisation336 kJ/mol
Molar heat capacity29.46 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 2194 2437
Atomic properties
Oxidation states7, 6, 5, 4, 3, 2 ​(an amphoteric oxide)
ElectronegativityPauling scale: 1.36
Ionisation energies
  • 1st: 604.5 kJ/mol
Atomic radiusempirical: 155 pm
Covalent radius190±1 pm
Coloyr lines in a spectral range
Spectral lines o Neptunium
Miscellanea
Creestal structurorthorhombic
Orthorhombic creestal structur for neptunium
Thermal conductivity6.3 W/(m·K)
Electrical resistivity1.220 µΩ·m (at 22 °C)
Magnetic orderinparamagnetic[2]
CAS Nummer7439-99-8
History
Naminefter planet Neptune, itsel named efter Roman god o the sea Neptune
DiskiveryEdwin McMillan an Philip H. Abelson (1940)
Main isotopes o neptunium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
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
| references | in Wikidata

Neptunium is a chemical element wi sembol Np an atomic nummer 93.

  1. 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. Retrieved 2014-08-06. 
  2. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.