{"id":185846,"date":"2025-01-23T08:22:07","date_gmt":"2025-01-23T08:22:07","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=185846"},"modified":"2025-01-23T08:22:09","modified_gmt":"2025-01-23T08:22:09","slug":"how-many-electrons-does-each-of-the-following-elements-have-in-its-outermost-electron-shell","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/01\/23\/how-many-electrons-does-each-of-the-following-elements-have-in-its-outermost-electron-shell\/","title":{"rendered":"How many electrons does each of the following elements have in its outermost electron shell"},"content":{"rendered":"\n<p>How many electrons does each of the following elements have in its outermost electron shell?<br>(a) Magnesium<br>(b) Molybdenum<br>(c) Selenium<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>To determine how many electrons are in the outermost shell of an element, we need to consider its position in the periodic table and its electron configuration. Elements are arranged in periods (rows) and groups (columns) based on their atomic structure. The outermost electrons, also known as valence electrons, are located in the highest energy level (shell) of an atom.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">(a) Magnesium (Mg)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Atomic number<\/strong>: 12<\/li>\n\n\n\n<li><strong>Electron configuration<\/strong>: 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2<\/li>\n<\/ul>\n\n\n\n<p>Magnesium has an atomic number of 12, meaning it has 12 electrons. These electrons are arranged in different shells. The first shell (1s\u00b2) holds 2 electrons, the second shell (2s\u00b2 2p\u2076) holds 8 electrons, and the third shell (3s\u00b2) holds 2 electrons. Therefore, the outermost electron shell (the third shell) has <strong>2 electrons<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">(b) Molybdenum (Mo)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Atomic number<\/strong>: 42<\/li>\n\n\n\n<li><strong>Electron configuration<\/strong>: [Kr] 4d\u2075 5s\u00b9<\/li>\n<\/ul>\n\n\n\n<p>Molybdenum has an atomic number of 42, meaning it has 42 electrons. These electrons are arranged in the following electron configuration: [Kr] 4d\u2075 5s\u00b9. The electron configuration shows that molybdenum has its outermost electrons in the 5th shell. In particular, the outermost electrons are in the 5s and 4d orbitals. There are <strong>6 electrons<\/strong> in the outermost shell (1 in 5s and 5 in 4d).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">(c) Selenium (Se)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Atomic number<\/strong>: 34<\/li>\n\n\n\n<li><strong>Electron configuration<\/strong>: [Ar] 3d\u00b9\u2070 4s\u00b2 4p\u2074<\/li>\n<\/ul>\n\n\n\n<p>Selenium has an atomic number of 34, meaning it has 34 electrons. The electron configuration for selenium is [Ar] 3d\u00b9\u2070 4s\u00b2 4p\u2074. This configuration shows that selenium\u2019s outermost electrons are in the 4th shell, specifically in the 4s and 4p orbitals. The outermost shell has a total of <strong>6 electrons<\/strong> (2 in 4s and 4 in 4p).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Summary:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Magnesium (Mg)<\/strong>: 2 electrons in the outermost shell.<\/li>\n\n\n\n<li><strong>Molybdenum (Mo)<\/strong>: 6 electrons in the outermost shell.<\/li>\n\n\n\n<li><strong>Selenium (Se)<\/strong>: 6 electrons in the outermost shell.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>How many electrons does each of the following elements have in its outermost electron shell?(a) Magnesium(b) Molybdenum(c) Selenium The Correct Answer and Explanation is : To determine how many electrons are in the outermost shell of an element, we need to consider its position in the periodic table and its electron configuration. Elements are arranged [&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-185846","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/185846","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=185846"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/185846\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=185846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=185846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=185846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}