Plantilya:Infobox neptunium

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Hydrogen (other non-metal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline earth metal)
Boron (metalloid)
Carbon (other non-metal)
Nitrogen (other non-metal)
Oxygen (other non-metal)
Fluorine (halogen)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline earth metal)
Aluminium (post-transition metal)
Silicon (metalloid)
Phosphorus (other non-metal)
Sulfur (other non-metal)
Chlorine (halogen)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline earth metal)
Scandium (transition metal)
Titanium (transition metal)
Vanadium (transition metal)
Chromium (transition metal)
Manganese (transition metal)
Iron (transition metal)
Cobalt (transition metal)
Nickel (transition metal)
Copper (transition metal)
Zinc (transition metal)
Gallium (post-transition metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (other non-metal)
Bromine (halogen)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline earth metal)
Yttrium (transition metal)
Zirconium (transition metal)
Niobium (transition metal)
Molybdenum (transition metal)
Technetium (transition metal)
Ruthenium (transition metal)
Rhodium (transition metal)
Palladium (transition metal)
Silver (transition metal)
Cadmium (transition metal)
Indium (post-transition metal)
Tin (post-transition metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (halogen)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline earth metal)
Lanthanum (lanthanoid)
Cerium (lanthanoid)
Praseodymium (lanthanoid)
Neodymium (lanthanoid)
Promethium (lanthanoid)
Samarium (lanthanoid)
Europium (lanthanoid)
Gadolinium (lanthanoid)
Terbium (lanthanoid)
Dysprosium (lanthanoid)
Holmium (lanthanoid)
Erbium (lanthanoid)
Thulium (lanthanoid)
Ytterbium (lanthanoid)
Lutetium (lanthanoid)
Hafnium (transition metal)
Tantalum (transition metal)
Tungsten (transition metal)
Rhenium (transition metal)
Osmium (transition metal)
Iridium (transition metal)
Platinum (transition metal)
Gold (transition metal)
Mercury (transition metal)
Thallium (post-transition metal)
Lead (post-transition metal)
Bismuth (post-transition metal)
Polonium (post-transition metal)
Astatine (halogen)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline earth metal)
Actinium (actinoid)
Thorium (actinoid)
Protactinium (actinoid)
Uranium (actinoid)
Neptunium (actinoid)
Plutonium (actinoid)
Americium (actinoid)
Curium (actinoid)
Berkelium (actinoid)
Californium (actinoid)
Einsteinium (actinoid)
Fermium (actinoid)
Mendelevium (actinoid)
Nobelium (actinoid)
Lawrencium (actinoid)
Rutherfordium (transition metal)
Dubnium (transition metal)
Seaborgium (transition metal)
Bohrium (transition metal)
Hassium (transition metal)
Meitnerium (unknown chemical properties)
Darmstadtium (unknown chemical properties)
Roentgenium (unknown chemical properties)
Copernicium (transition metal)
Ununtrium (unknown chemical properties)
Flerovium (unknown chemical properties)
Ununpentium (unknown chemical properties)
Livermorium (unknown chemical properties)
Ununseptium (unknown chemical properties)
Ununoctium (unknown chemical properties)
silvery metallic
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan neptunium, Np, 93
Paglitok /nɛpˈtjniəm/
[[Help:Pronunciation respelling key|nep-Plantilya:Smallcaps all-nee-əm]]
Kategoriyang elemento aktinido
Group, period, block [[group {{{group}}} element|{{{group}}}]], 7, f
Gibug-aton sa atomo (237)
Kontorno sa elektron [Rn] 5f4 6d1 7s2
2, 8, 18, 32, 22, 9, 2
Electron shells of neptunium (2, 8, 18, 32, 22, 9, 2)
Pagkadiskobre Edwin McMillan and Philip H. Abelson (1940)
Physical properties
Phase magahi
Density (near r.t.) 20.45[1] g·cm−3
Melting point 910 K, 637 °C, 1179 °F
Boiling point 4273 K, 4000 °C, 7232 °F
Heat of fusion 3.20 kJ·mol−1
Heat of vaporization 336 kJ·mol−1
Molar heat capacity 29.46 J·mol−1·K−1
Vapor pressure
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
(amphoteric oxide)
Electronegativity 1.36 (Pauling scale)
Ionization energies 1st: 604.5 kJ·mol−1
Atomic radius 155 pm
Covalent radius 190±1 pm
Crystal structure orthorhombic
Neptunium has a orthorhombic crystal structure
Magnetic ordering paramagnetic[2]
Electrical resistivity (22 °C) 1.220 µΩ·m
Thermal conductivity 6.3 W·m−1·K−1
CAS registry number 7439-99-8
Most stable isotopes
Main article: Isotopes of neptunium
iso NA half-life DM DE (MeV) DP
235Np syn 396.1 d α 5.192 231Pa
ε 0.124 235U
236Np syn 1.54×105 y ε 0.940 236U
β 0.940 236Pu
α 5.020 232Pa
237Np trace 2.144×106 y SF & α 4.959 233Pa
239Np trace 2.356 d β 0.218 239Pu
· r

Plantilya:Template reference list

  1. Criticality of a 237Np Sphere
  2. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.