{"id":230908,"date":"2025-06-10T07:58:49","date_gmt":"2025-06-10T07:58:49","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=230908"},"modified":"2025-06-10T07:58:51","modified_gmt":"2025-06-10T07:58:51","slug":"br-85-a-write-the-full-electron-configuration-for-an-atom-of-bromine-in-the-ground-state","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/10\/br-85-a-write-the-full-electron-configuration-for-an-atom-of-bromine-in-the-ground-state\/","title":{"rendered":"Br 85 (a) Write the full electron configuration for an atom of bromine in the ground state."},"content":{"rendered":"\n<p>Br 85 (a) Write the full electron configuration for an atom of bromine in the ground state. 1<br>l = 1<br>m_l = 2<br>Z_{eff}$? 1s.<\/p>\n\n\n\n<pre id=\"preorder-ask-header-text\" class=\"wp-block-preformatted\">Br 85 (a) Write the full electron configuration for an atom of bromine in the ground state. 1\u00b2\u00b2\u00b2\u00b2\u00b9\u00b22s\u00b22p?3s\u00b23p?4s\u00b23d\u00b9?4p?(b)Howmanyelectronsinabromineatomhavequantumnumberl = 1?6e?(c)Howmanyelectronsinabromineatomhavequantumnumberm_l = 2?2(d)Whichisbigger:onebromineatomoronebromideion?Explainwhy.BrorBr?bromideion.Anionsarebiggerthantheirneutralatoms(e)Whichhasalargerionizationenergy:bromineorpotassium?BrInabromineatom,electronsinwhichorbitalhavethelargestZ_{eff}$? 1s.<\/pre>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Correct Answer:<\/strong><\/h3>\n\n\n\n<p><strong>(a) Full Electron Configuration for Bromine (Br), Atomic Number 35:<\/strong><\/p>\n\n\n\n<p><strong>1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 4s\u00b2 3d\u00b9\u2070 4p\u2075<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Explanation<\/strong><\/h3>\n\n\n\n<p>Bromine (Br) is a halogen with an atomic number of <strong>35<\/strong>, meaning it has <strong>35 electrons<\/strong> in its ground state. The electron configuration describes the distribution of electrons in various atomic orbitals, filled according to <strong>Aufbau&#8217;s principle<\/strong> (electrons fill lower energy orbitals first), <strong>Pauli\u2019s Exclusion Principle<\/strong>, and <strong>Hund\u2019s Rule<\/strong>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Step-by-step filling of orbitals:<\/strong><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>1s\u00b2<\/strong> \u2192 2 electrons<\/li>\n\n\n\n<li><strong>2s\u00b2<\/strong> \u2192 2 electrons<\/li>\n\n\n\n<li><strong>2p\u2076<\/strong> \u2192 6 electrons<\/li>\n\n\n\n<li><strong>3s\u00b2<\/strong> \u2192 2 electrons<\/li>\n\n\n\n<li><strong>3p\u2076<\/strong> \u2192 6 electrons<\/li>\n\n\n\n<li><strong>4s\u00b2<\/strong> \u2192 2 electrons<\/li>\n\n\n\n<li><strong>3d\u00b9\u2070<\/strong> \u2192 10 electrons<\/li>\n\n\n\n<li><strong>4p\u2075<\/strong> \u2192 5 electrons<br>\u00a0\u00a0\u00a0\u00a0\u2192 Total = 35 electrons<\/li>\n<\/ol>\n\n\n\n<p>Thus, the configuration is:<br><strong>1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 4s\u00b2 3d\u00b9\u2070 4p\u2075<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Quantum Numbers:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The question mentions <strong>l = 1<\/strong> and <strong>m_l = 2<\/strong>.\n<ul class=\"wp-block-list\">\n<li><strong>l = 1<\/strong> corresponds to a <strong>p orbital<\/strong>.<\/li>\n\n\n\n<li><strong>m_l<\/strong> can range from <strong>\u2013l to +l<\/strong>, i.e., <strong>\u20131, 0, +1<\/strong> for p orbitals.<\/li>\n\n\n\n<li>So, <strong>m_l = 2 is invalid for l = 1<\/strong>.<br>\u21d2 No electron in a p orbital can have <strong>m_l = 2<\/strong>.<br>\u21d2 Likely a <strong>misinterpretation or typo<\/strong>.<\/li>\n<\/ul>\n<\/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>Effective Nuclear Charge (Z\u2091\u2091f):<\/strong><\/h3>\n\n\n\n<p>Effective nuclear charge (<strong>Z\u2091\u2091f<\/strong>) is the net positive charge experienced by an electron, accounting for shielding by inner electrons.<\/p>\n\n\n\n<p>Using Slater\u2019s rules or a simplified estimate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>For a <strong>4p electron in Br<\/strong>, Z\u2091\u2091f \u2248 <strong>35 \u2013 shielding \u2248 7\u20138<\/strong><\/li>\n<\/ul>\n\n\n\n<p>The valence electrons in 4p feel a reduced attraction due to shielding from inner shells (1s\u20133d). This reduced charge is why Br can easily gain 1 electron to form Br\u207b.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Summary:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bromine ground-state configuration: <strong>1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 4s\u00b2 3d\u00b9\u2070 4p\u2075<\/strong><\/li>\n\n\n\n<li><strong>m_l = 2 is not valid<\/strong> for l = 1 (p orbital).<\/li>\n\n\n\n<li><strong>Z\u2091\u2091f for 4p electron<\/strong> is approx. <strong>7\u20138<\/strong>, explaining its chemical reactivity.<\/li>\n<\/ul>\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-banner4-818.jpeg\" alt=\"\" class=\"wp-image-230909\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Br 85 (a) Write the full electron configuration for an atom of bromine in the ground state. 1l = 1m_l = 2Z_{eff}$? 1s. Br 85 (a) Write the full electron configuration for an atom of bromine in the ground state. 1\u00b2\u00b2\u00b2\u00b2\u00b9\u00b22s\u00b22p?3s\u00b23p?4s\u00b23d\u00b9?4p?(b)Howmanyelectronsinabromineatomhavequantumnumberl = 1?6e?(c)Howmanyelectronsinabromineatomhavequantumnumberm_l = 2?2(d)Whichisbigger:onebromineatomoronebromideion?Explainwhy.BrorBr?bromideion.Anionsarebiggerthantheirneutralatoms(e)Whichhasalargerionizationenergy:bromineorpotassium?BrInabromineatom,electronsinwhichorbitalhavethelargestZ_{eff}$? 1s. The Correct Answer and Explanation is: Correct Answer: (a) [&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-230908","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/230908","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=230908"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/230908\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=230908"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=230908"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=230908"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}