Nẹ́ptúníọ̀m

Nẹ́ptúníọ̀m tabi Neptunium je apilese kemika pelu ami-idamo Np ati nomba atomu 93.

Neptunium, ₉₃Np

Neptunium
Pípè	/nɛpˈtjuːniəm/ ​(nep-TEW-nee-əm)
Ìhànsójú	silvery metallic
nọ́mbà ìsújọ	[237]
Neptunium ní orí tábìlì àyè
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 Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Pm ↑ Np ↓ (Uqt) uranium ← neptunium → plutonium
Nọ́mbà átọ̀mù (Z)	93
Ẹgbẹ́	group n/a
Àyè	àyè 7
Àdìpọ̀	Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì	Actinide
Ìtò ẹ̀lẹ́ktrọ́nù	[Rn] 5f4 6d1 7s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 32, 22, 9, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	910 K ​(637 °C, ​1179 °F)
Ígbà ìhó	4273 K ​(4000 °C, ​7232 °F)
Kíki (near r.t.)	20.45  g/cm3
Heat of fusion	3.20 kJ/mol
Heat of	336 kJ/mol
Molar heat capacity	29.46 J/(mol·K)
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 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.36
Atomic radius	empirical: 155 pm
Covalent radius	190±1 pm
Color lines in a spectral range Spectral lines of neptunium
Other properties
Natural occurrence	from decay
Crystal structure	​3 forms: orthorhombic, tetragonal and cubic
Thermal conductivity	6.3 W/(m·K)
Electrical resistivity	(22 °C) 1.220 µ Ω·m
Magnetic ordering	paramagnetic
CAS Number	7439-99-8
Main isotopes of neptunium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 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 syn 2.144×106 y SF & α 4.959 233Pa