Nihonium\u00a0is a\u00a0synthetic\u00a0chemical element\u00a0with the\u00a0symbol\u00a0Nh\u00a0and\u00a0atomic number\u00a0113. It is extremely\u00a0radioactive; its most stable known\u00a0isotope, nihonium-286, has a\u00a0half-life\u00a0of about 10\u00a0seconds. In the\u00a0periodic table, nihonium is a\u00a0transactinide element\u00a0in the\u00a0p-block. It is a member of\u00a0period\u00a07\u00a0and\u00a0group 13\u00a0(boron group).<\/p>\n
Nihonium was first reported to have been created in 2003 by a Russian\u2013American collaboration at the\u00a0Joint Institute for Nuclear Research\u00a0(JINR) in\u00a0Dubna, Russia, and in 2004 by a team of Japanese scientists at\u00a0Riken\u00a0in\u00a0Wak\u014d, Japan. The confirmation of their claims in the ensuing years involved independent teams of scientists working in the United States, Germany, Sweden, and China, as well as the original claimants in Russia and Japan. In 2015, the\u00a0IUPAC\/IUPAP Joint Working Party\u00a0recognized the element and assigned the\u00a0priority\u00a0of the discovery and naming rights for the element to Riken, as it judged that they had demonstrated that they had observed element 113 before the JINR team did so. The Riken team suggested the name\u00a0nihonium\u00a0in 2016, which was approved in the same year. The name comes from the common Japanese name for Japan\u00a0(\u65e5\u672c,\u00a0Nihon).<\/p>\n
Very little is known about nihonium, as it has only been made in very small amounts that decay away within seconds. The anomalously long lives of some superheavy nuclides, including some nihonium isotopes, are explained by the “island of stability” theory. Experiments support the theory, with the half-lives of the confirmed nihonium isotopes increasing from milliseconds to seconds as\u00a0neutrons\u00a0are added and the island is approached. Nihonium has been calculated to have similar properties to its homologues\u00a0boron,\u00a0aluminium,\u00a0gallium,\u00a0indium, and\u00a0thallium. All but boron are\u00a0post-transition metals, and nihonium is expected to be a post-transition metal as well. It should also show several major differences from them; for example, nihonium should be more stable in the +1\u00a0oxidation state\u00a0than the +3 state, like thallium, but in the +1 state nihonium should behave more like\u00a0silver\u00a0and\u00a0astatine\u00a0than thallium. Preliminary experiments in 2017 showed that elemental nihonium is not very\u00a0volatile; its chemistry remains largely unexplored.<\/p>","protected":false},"excerpt":{"rendered":"
113-Nihonium\u00a0– placeholder – Radioactive symbol<\/p>","protected":false},"featured_media":49130,"template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"product_brand":[],"product_cat":[87,290],"product_tag":[],"class_list":{"0":"post-5771","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-elements-in-acrylic-cubes","7":"product_cat-nh","8":"desktop-align-left","9":"tablet-align-left","10":"mobile-align-left","11":"ast-product-gallery-layout-horizontal-slider","12":"ast-product-tabs-layout-horizontal","13":"ast-qv-on-image","15":"first","16":"instock","17":"taxable","18":"shipping-taxable","19":"purchasable","20":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/smart-elements.com\/de\/wp-json\/wp\/v2\/product\/5771","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smart-elements.com\/de\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/smart-elements.com\/de\/wp-json\/wp\/v2\/types\/product"}],"version-history":[{"count":0,"href":"https:\/\/smart-elements.com\/de\/wp-json\/wp\/v2\/product\/5771\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/smart-elements.com\/de\/wp-json\/wp\/v2\/media\/49130"}],"wp:attachment":[{"href":"https:\/\/smart-elements.com\/de\/wp-json\/wp\/v2\/media?parent=5771"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/smart-elements.com\/de\/wp-json\/wp\/v2\/product_brand?post=5771"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/smart-elements.com\/de\/wp-json\/wp\/v2\/product_cat?post=5771"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/smart-elements.com\/de\/wp-json\/wp\/v2\/product_tag?post=5771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}