{"id":217651,"date":"2025-05-22T09:23:57","date_gmt":"2025-05-22T09:23:57","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=217651"},"modified":"2025-05-22T09:23:59","modified_gmt":"2025-05-22T09:23:59","slug":"which-one-of-the-following-species-has-the-same-electron-configuration-asthe-al3-cationa-f-b-cl-c-s2-d-o-e-mg","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/22\/which-one-of-the-following-species-has-the-same-electron-configuration-asthe-al3-cationa-f-b-cl-c-s2-d-o-e-mg\/","title":{"rendered":"Which one of the following species has the same electron configuration asthe Al3+ cation?A F \u2013B Cl\u2013C S2\u2013 D O\u2013 E Mg+"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Which one of the following species has the same electron configuration asthe Al3+ cation?A F \u2013B Cl\u2013C S2\u2013 D O\u2013 E Mg+<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><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 class=\"wp-block-paragraph\"><strong>Correct Answer: E. Mg\u207a<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Explanation (300+ words):<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">To determine which species has the same electron configuration as the <strong>Al\u00b3\u207a (aluminum ion)<\/strong>, we must first understand the <strong>electron configuration of a neutral aluminum atom (Al)<\/strong> and how it changes when it loses electrons to form Al\u00b3\u207a.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 1: Electron Configuration of Neutral Aluminum (Al)<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Aluminum has an atomic number of 13, meaning it has 13 electrons in its neutral state.<\/li>\n\n\n\n<li>The ground-state electron configuration is: $$<br>\\text{Al}: 1s^2 \\, 2s^2 \\, 2p^6 \\, 3s^2 \\, 3p^1<br>$$<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 2: Electron Configuration of Al\u00b3\u207a<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Al\u00b3\u207a means that aluminum has lost <strong>three electrons<\/strong>.<\/li>\n\n\n\n<li>These electrons are removed from the outermost energy level (first from 3p and then 3s orbitals).<\/li>\n\n\n\n<li>So we remove the <strong>3p\u00b9 and 3s\u00b2 electrons<\/strong>, leaving: $$<br>\\text{Al}^{3+}: 1s^2 \\, 2s^2 \\, 2p^6<br>$$<\/li>\n\n\n\n<li>This configuration corresponds to a total of <strong>10 electrons<\/strong>, the same as a <strong>neon (Ne)<\/strong> atom (noble gas with atomic number 10).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 3: Find Which Species Also Has 10 Electrons<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Now, evaluate each answer choice:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A. F\u207b<\/strong> (Fluoride ion):<br>Fluorine has 9 electrons. F\u207b gains 1 electron \u2192 10 electrons.<br>\u2713 Possible match.<\/li>\n\n\n\n<li><strong>B. Cl\u207b<\/strong> (Chloride ion):<br>Chlorine has 17 electrons. Cl\u207b has 18 electrons.<br>\u2717 Too many electrons.<\/li>\n\n\n\n<li><strong>C. S\u00b2\u207b<\/strong> (Sulfide ion):<br>Sulfur has 16 electrons. S\u00b2\u207b has 18 electrons.<br>\u2717 Too many electrons.<\/li>\n\n\n\n<li><strong>D. O\u207b<\/strong> (Oxide ion):<br>Oxygen has 8 electrons. O\u207b has 9 electrons.<br>\u2717 Too few electrons.<\/li>\n\n\n\n<li><strong>E. Mg\u207a<\/strong> (Magnesium ion with a +1 charge):<br>Magnesium has 12 electrons. Mg\u207a has lost 1 electron \u2192 11 electrons.<br>\u2717 Too many electrons.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Wait \u2014 there&#8217;s a mistake here. The question asked <strong>which one has the same configuration as Al\u00b3\u207a<\/strong>, which has <strong>10 electrons<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Let\u2019s re-check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A. F\u207b<\/strong> \u2192 10 electrons \u2192 Configuration: 1s\u00b2 2s\u00b2 2p\u2076 \u2714\ufe0f<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">So the correct match is <strong>F\u207b<\/strong>, not <strong>Mg\u207a<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 <strong>Corrected Answer: A. F\u207b<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Final Explanation:<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Both <strong>Al\u00b3\u207a<\/strong> and <strong>F\u207b<\/strong> have 10 electrons, giving them the same <strong>electron configuration: 1s\u00b2 2s\u00b2 2p\u2076<\/strong>. This configuration is isoelectronic with <strong>neon<\/strong>, a noble gas. Isoelectronic species have the same number of electrons and hence the same electron configuration, although their nuclear charges differ.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thus, the species with the same electron configuration as Al\u00b3\u207a is <strong>F\u207b<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/05\/image-31.png\" alt=\"\" class=\"wp-image-217652\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Which one of the following species has the same electron configuration asthe Al3+ cation?A F \u2013B Cl\u2013C S2\u2013 D O\u2013 E Mg+ The Correct Answer and Explanation is: Correct Answer: E. Mg\u207a Explanation (300+ words): To determine which species has the same electron configuration as the Al\u00b3\u207a (aluminum ion), we must first understand the electron [&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-217651","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/217651","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=217651"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/217651\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=217651"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=217651"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=217651"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}