మూస:Infobox neptunium

నెప్ట్యూనియం, ₀₀Np

నెప్ట్యూనియం
Pronunciation	/nɛpˈtjuːniəm/ ​(nep-TEW-nee-əm)
Appearance	silvery metallic
Mass number	[237]
నెప్ట్యూనియం in the periodic table
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 Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver 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 Mercury (element) Thallium Lead 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) యురేనియం ← నెప్ట్యూనియం → ప్లుటోనియం
Group	మూస:Infobox element/symbol-to-group/format
Period	period 7
Block	f-block
Electron configuration	[Rn] 5f4 6d1 7s2
Electrons per shell	2, 8, 18, 32, 22, 9, 2
Physical properties
Phase at STP	solid
Melting point	912 K ​(639 °C, ​1182 °F)
Boiling point	4447 K ​(4174 °C, ​7545 (extrapolated) °F)
Density (near r.t.)	(alpha) 20.45 g/cm3 (accepted standard value) 19.38 g/cm3
Heat of fusion	5.19 kJ/mol
Heat of vaporization	336 kJ/mol
Molar heat capacity	29.46 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2194 2437
Atomic properties
Oxidation states	+2, +3, +4, +5, +6, +7 (an amphoteric oxide)
Electronegativity	Pauling scale: 1.36
Atomic radius	empirical: 155 pm
Covalent radius	190±1 pm
Spectral lines of నెప్ట్యూనియం
Other properties
Natural occurrence	from decay
Crystal structure	​orthorhombic
Thermal conductivity	6.3 W/(m⋅K)
Electrical resistivity	(22 °C) 1.220 µ Ω⋅m
Magnetic ordering	పారామాగ్నెటిక్
CAS Number	7439-99-8
History
Discovery	ఎడ్విన్ మెక్‌మిలన్, ఫిలిప్ అబెల్సన్ (1940)
Isotopes of నెప్ట్యూనియం

References

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