Neptunium Element in Periodic Table | Atomic Number Atomic Mass

Neptunium

Neptunium Element:

Neptunium is a chemical element found in the actinide series of periodic table. It is represented by the symbol Np and its atomic number is 93. It is preceded by Uranium and succeeded by Plutonium in the actinide series. Since it is placed next to uranium in the actinide series, it has been named after the planet Neptune existing next to the planet Uranus (when considered away from the sun) in an analogous order of outer planets in the solar system. Neptunium is a silvery metallic in appearance. It is moderately radioactive and ductile. Confirmed observations show that neptunium exists in three forms of allotropes, named as alpha, beta and gamma analogs. The alpha variety of neptunium is stable upto 282°C and its beta version is stable between 282°C and  583 °C and the gamma isotope can stay in solid phase till 639°C.

Neptunium has twenty isotopes with mass numbers 225 to 244. Neptunium does not have stable isotopes. Neptunium-237 is found to have the longest half-life of about 2.14 million years.

Uses Of Neptunium Element:

  • Neptunium is mainly used for research purposes. It is used in radioactive decay process for production of plutonium. Neptunium is also used in neutron detection equipment.

Neptunium

Neptunium Element Information:

Discovery year:  1940

Discovered by:Edwin McMillan and Philip H. Abelson

Atomic number: 93

Relative atomic mass: [237]

Electron configuration: [Rn] 5f4 6d1 7s2

Block: f-block

Other elements in the same block:

Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Thorium, Protactinium, Uranium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium and  Lawrencium are the elements in the same block.

Period: period 7

Other elements in the same period:

Francium, Radium, Actinium, Thorium, Protactinium, Uranium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium, Lawrencium, Rutherfordium, Dubnium, Seaborgium, Bohrium, Hassium, Meitnerium, Darmstadtium, Roentgenium, Copernicium, Nihonium, Flerovium, Moscovium, Livermorium, Tennessine and Oganesson.

Group: Actinides

Other elements in the same group:

Thorium, Protactinium, Uranium, Plutonium, AmericiumCurium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium and Lawrencium are the elements in the same group.

Other elements in the same orbital:

Actinium, Thorium, Protactinium, Uranium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium and Lawrencium are the elements in the same orbital.

Allotropes: none

Key isotopes: 237Np 

Melting point: 644°C, 1191°F, 917 K 

Boiling point: 3902°C, 7056°F, 4175 K

Element category:  actinide

Density (g cm−3): 20.2

CAS number: 7439-99-8

Color: silvery metallic

You can know detailed information for each element,

Hydrogen, HeliumLithiumBerylliumBoronCarbonNitrogenOxygenFluorine,  Neon , SodiumMagnesiumAluminiumSiliconPhosphorusSulfurChlorineArgon, PotassiumCalciumScandiumTitaniumVanadiumChromiumManganeseIronCobaltNickelCopperZincGalliumGermaniumArsenicSeleniumBromine, Krypton,  Rubidium, StrontiumYttriumZirconiumNiobiumMolybdenumTechnetiumRutheniumRhodiumPalladiumSilverCadmiumIndiumTinAntimonyTelluriumIodine, Xenon,  Caesium, BariumLanthanum,  CeriumPraseodymiumNeodymiumPromethiumSamariumEuropiumGadoliniumTerbiumDysprosiumHolmiumErbiumThuliumYtterbiumLutetiumHafniumTantalumTungstenRheniumOsmiumIridiumPlatinumGoldMercuryThalliumLeadBismuthPoloniumAstatine, Radon,  Francium, RadiumActiniumThoriumProtactiniumUraniumNeptuniumPlutoniumAmericiumCuriumBerkeliumCaliforniumEinsteiniumFermiumMendeleviumNobeliumLawrenciumRutherfordiumDubniumSeaborgiumBohriumHassiumMeitneriumDarmstadtiumRoentgeniumCoperniciumNihoniumFleroviumMoscoviumLivermoriumTennessine, Oganesson.

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