Neptunium

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Neptunium,  93Np
Neptunium2.jpg
General properties
Appearance sillery metallic
Mass nummer 237 (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 Gold 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
Group group n/a
Period period 7
Element category   actinide
Block f-block
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]
acceptit staundart value: 19.38 g/cm3
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 7, 6, 5, 4, 3, 2 ​(an amphoteric oxide)
Electronegativity Pauling scale: 1.36
Ionisation energies
  • 1st: 604.5 kJ/mol
Atomic radius empirical: 155 pm
Covalent radius 190±1 pm
Color lines in a spectral range
Miscellanea
Creestal structurorthorhombic
Orthorhombic creestal structur for neptunium
Thermal conductivity 6.3 W/(m·K)
Electrical resistivity 1.220 µΩ·m (at 22 °C)
Magnetic orderin paramagnetic[2]
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
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.