Neptunium - Wikipedia
Neptunium is a chemical element; it has symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. It is named after Neptune, the planet beyond Uranus in the Solar System, which uranium is named after. A neptunium atom has 93 protons and 93 electrons, of which seven are valence electrons.
Neptunium - Element information, properties and uses | Periodic …
A silvery, metallic substance like so many of its neighbours, its most stable form is the isotope neptunium 237 with a half life - the time it takes for half of the original amount to decay - of over 2 million years, and this is the type of neptunium most likely now to be produced as a by product from nuclear reactors.
镎 - 维基百科，自由的百科全书
镎 （ ná ） （英語： Neptunium ；台湾譯 錼 （ nài ） ），是一種化學元素，其化學符號为Np，原子序數为93。 屬於 錒系元素 ，且是首個 超鈾元素 ，於1940年由 柏克萊輻射實驗室 的 埃德温·麦克米伦 和 菲力普·艾貝爾森 首次合成出來，並參照以 天王星 （ Uranus ...
Neptunium | Np (Element) - PubChem
Neptunium has the largest liquid range of any element, 3363 K, between the metal melting point and boiling point. It is the most dense of all the actinides and the fifth most dense of all naturally occurring elements. Recently a neptunium-based superconductor alloy was discovered with formula NpPd 5 Al 2. The occurrence of superconductivity in ...
镎 - 维基百科，自由的百科全书
2024年11月24日 · 镎 （ ná ） （英语： Neptunium ；台湾译 錼 （ nài ） ），是一种化学元素，其化学符号为Np，原子序数为93。 属于 锕系元素 ，且是首个 超铀元素 ，于1940年由 柏克莱辐射实验室 的 埃德温·麦克米伦 和 菲力普·艾贝尔森 首次合成出来，并参照以 天王星 （ Uranus ...
Neptunium | Radioactive, Fissionable, Transuranic | Britannica
Neptunium (Np), radioactive chemical element of the actinoid series of the periodic table that was the first transuranium element to be artificially produced, atomic number 93. Though traces of neptunium have subsequently been found in nature, where it is not primeval but produced by
Periodic Table of Elements: Los Alamos National Laboratory
Neptunium metal is silver in appearance, chemically reactive and is found in at least three allotropes: Neptunium has the largest liquid range of any element, 3363 K, between the metal melting point and boiling point. It is the most dense of all the actinides and the fifth most dense of all naturally occurring elements.
Neptunium Element Facts - chemicool.com
Neptunium is a silvery radioactive synthetic metal. (Miniscule quantities of neptunium-237 and neptunium-239 are found in nature as a result of beta decay of uranium.) Neptunium exists in three allotropes: it has an orthorhombic structure at normal temperatures, a tetragonal structure above 280 o C and a cubic structure above 577 o C. (2)
Neptunium | History, Uses, Facts, Physical & Chemical …
Neptunium is a radioactive metal. It has hard silvery metallic appearance and tarnishes with the exposure to air. It occurs in three allotropic forms. Neptunium has 7 electrons in its valence shell. Neptunium is the first transuranic element and belongs to actinide series.
Neptunium: A Comprehensive Guide to its Properties, Uses, and …
- Neptunium is a silvery radioactive metallic element that belongs to the actinide series in the periodic table. - It plays a significant role in nuclear research, primarily due to its potential use in breeder reactors. - As an actinide, Neptunium is a metal. - Neptunium was the first transuranium element discovered.