{"id":236675,"date":"2025-06-16T12:15:40","date_gmt":"2025-06-16T12:15:40","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=236675"},"modified":"2025-06-16T12:15:42","modified_gmt":"2025-06-16T12:15:42","slug":"cu-has-the-following-electron-configuration-ar-3d10-4s1","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/16\/cu-has-the-following-electron-configuration-ar-3d10-4s1\/","title":{"rendered":"(Cu+) has the following electron configuration: [Ar] 3d^10 4s^1"},"content":{"rendered":"\n<p>(Cu+) has the following electron configuration: [Ar] 3d^10 4s^1<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/06\/image-582.png\" alt=\"\" class=\"wp-image-236676\"\/><\/figure>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>Correct Answer: [Ar] 3d\u00b9\u2070<\/strong><\/p>\n\n\n\n<p>Copper (Cu) has an atomic number of 29. In its neutral state, the expected electron configuration would follow the order of filling orbitals using the Aufbau principle. However, copper is an exception. Instead of filling the 4s orbital completely first, it arranges itself for stability. The neutral configuration becomes:<br><strong>[Ar] 4s\u00b9 3d\u00b9\u2070<\/strong><br>This arrangement provides a fully filled 3d subshell which is more stable than partially filled orbitals.<\/p>\n\n\n\n<p>When copper loses one electron to form the <strong>Cu\u207a ion<\/strong>, the electron is removed from the <strong>4s orbital<\/strong> first. The 4s orbital, although filled before the 3d orbital, is higher in energy once electrons occupy both subshells. Therefore, the electron from 4s\u00b9 is removed, leaving:<br><strong>[Ar] 3d\u00b9\u2070<\/strong><\/p>\n\n\n\n<p>This makes <strong>[Ar] 3d\u00b9\u2070<\/strong> the correct electron configuration for Cu\u207a.<\/p>\n\n\n\n<p>The other options are incorrect for the following reasons:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>[Ar] 3d\u2078<\/strong> suggests two electrons were removed, which would be Cu\u00b2\u207a, not Cu\u207a.<\/li>\n\n\n\n<li><strong>[Ar] 4s\u00b9 3d\u2079<\/strong> represents the electron arrangement before losing the 4s electron, so this is for neutral copper.<\/li>\n\n\n\n<li><strong>[Ar] 4s\u00b9<\/strong> suggests only the 4s orbital is involved, ignoring the d electrons, which is inaccurate for copper.<\/li>\n<\/ul>\n\n\n\n<p>Understanding copper&#8217;s electron behavior requires knowledge of exceptions in electron configurations. Transition metals often exhibit irregular configurations due to the stability offered by half-filled or fully filled d subshells. This unique behavior affects both the chemistry and the ion formation of elements like copper.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-704.jpeg\" alt=\"\" class=\"wp-image-236677\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>(Cu+) has the following electron configuration: [Ar] 3d^10 4s^1 The Correct Answer and Explanation is: Correct Answer: [Ar] 3d\u00b9\u2070 Copper (Cu) has an atomic number of 29. In its neutral state, the expected electron configuration would follow the order of filling orbitals using the Aufbau principle. However, copper is an exception. Instead of filling the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"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":"","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-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":"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":""},"mobile":{"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":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-236675","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/236675","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=236675"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/236675\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=236675"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=236675"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=236675"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}