Neptunium is a chemical element with the symbol Np and atomic number 93. 3 Uses 3.1 Uses & Benefits Currently known uses of Neptunium metal are limited to research purpose only. Symbol of the Neptunium element is Np. Thiamin is a compound and the terms metal, nonmetal and metalloid apply to elements. Its atomic number is 93. McMillan and Abelson bombarded uranium-238 with neutrons and they were able to show chemically that they had produced neptunium-239, which has a half-life of just 2.3 days… In the periodic table, it is located to the right of the actinide uranium, to the left of the actinide plutonium and below the lanthanide promethium. The crystal structures of neptunium, protactinium, uranium, and plutonium do not have clear analogs among the lanthanides and are more similar to those of the 3d transition metals. It is named after the planet Neptune in the same way as Uranium is named after the planet Uranus. No phase transition was observed up to 52 GPa. It is scarcely used, although it is fissionable. Transition temperatures/or neptunium metal Phase Heating values* i Cooling values* Values Thermal analysis Dilatometry Resistivity Dilatometry Resistivity in U.S.A. a^ 286 273 285 263 278t1' >v 578 5770 574 5770 574 c550-570(1) y-*liq. Neptunium has no known biological role. Neptunium is a chemical element which is the 5 th member of the Actinide series and is placed in the 7 th period. All rights reserved. This differs from the configuration expected by the Aufbau principle in that one electron is in the 6d subshell instead of being as expected in the 5f subshell. A PRELIMINARY study has been made of the properties of a small piece of neptunium prepared elsewhere in these laboratories by a bomb reduction process. chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Your email address will not be published. In the periodic table, it is located to the right of the actinide uranium, to the left of the actinide plutonium, and below the lanthanide promethium. Neptunium is a chemical element with the symbol Np and atomic number 93. Corrections? All neptunium isotopes are radioactive; the stablest is neptunium-237, with a half-life of 2,144,000 years, and among the most unstable is neptunium-225, with a half-life of more than 2 microseconds. After reduction of the oxide to metal, the metal is separated by density from the other components of the reaction mixture and can easily removed upon cooling. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. It is produced through neutron bombardment of a uranium nucleus. The real neptunium sits between uranium and plutonium in the actinides, the floating bar on the periodic table that pops out from between radium and lawrencium. We get a close-up look at Neptunium during a visit to the National Nuclear Laboratory at Sellafield. Neptunium has 7 electrons in its valence shell. A radioactive actinide metal, neptunium is the first transuranic element.Its position in the periodic table just after uranium, named after the planet Uranus, led to it being named after Neptune, the next planet beyond Uranus.A neptunium atom has 93 protons and 93 electrons, of which seven are valence electrons.Neptunium metal is … All 15 actinide elements have very large atomic radii and are radioactive.Neptunium is a silver metal and is very reactive, with four different oxidation states. Neptunium metal is silver in appearance, chemically reactive and is found in at least three allotropes: α-neptunium, (room temperature) orthorhombic, density 20.45 g/cm 3; ß-neptunium (above 280 °C), tetragonal, density (313 °C) 19.36 g/cm 3; γ-neptunium (above 577 °C), cubic, density (600 °C) 18 g/cm 3; Neptunium has the largest liquid range of any element, 3363 K, between the metal melting point … Oxidation states, ranging from +3 to +7 transformations in neptunium metal is hard! Silvery, ductile, radioactive actinide metal, neptunium pronunciation, neptunium is the first transuranic element and belongs the! Its use as an entry route into molecular chemical studies 91 ) in 1940 at Berkeley Radiation Laboratory of actinide! Of questionable purity theory suggested that one of the actinide series, row 5f of the element was named the! 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