{"id":264969,"date":"2025-07-21T17:25:16","date_gmt":"2025-07-21T17:25:16","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=264969"},"modified":"2025-07-21T17:25:20","modified_gmt":"2025-07-21T17:25:20","slug":"draw-the-molecular-orbital-diagram-for-b2","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/21\/draw-the-molecular-orbital-diagram-for-b2\/","title":{"rendered":"Draw the molecular orbital diagram for B2"},"content":{"rendered":"\n<p>Draw the molecular orbital diagram for B2. The number of unpaired electrons in the B2 molecule is <strong>_<\/strong>. <\/p>\n\n\n\n<p>A. zero <\/p>\n\n\n\n<p>B. 1 <\/p>\n\n\n\n<p>C. 2 <\/p>\n\n\n\n<p>D. 3 <\/p>\n\n\n\n<p>E. 4<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\">The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>The correct answer is <strong>C. 2<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>Boron (B) has an atomic number of 5, which means each boron atom has 5 electrons. For the B\u2082 molecule, there are 10 electrons in total. These electrons fill the molecular orbitals in the order of increasing energy, based on the molecular orbital theory.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Molecular Orbitals for Diatomic Molecules:<\/h4>\n\n\n\n<p>The molecular orbital diagram for a diatomic molecule like B\u2082 consists of bonding and antibonding orbitals formed by the atomic orbitals of each atom. The order of filling for molecular orbitals in the case of homonuclear diatomic molecules like B\u2082 depends on whether the molecule is in the first or second row of the periodic table.<\/p>\n\n\n\n<p>For B\u2082, the relevant orbitals are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u03c3(1s), \u03c3*(1s), \u03c3(2s), \u03c3*(2s), \u03c3(2pz), \u03c0(2px) = \u03c0(2py), \u03c0*(2px) = \u03c0*(2py), and \u03c3*(2pz).<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Filling the Orbitals:<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The lowest-energy molecular orbitals, \u03c3(1s) and \u03c3*(1s), each can hold two electrons. These orbitals are filled first.<\/li>\n\n\n\n<li>Next, the \u03c3(2s) and \u03c3*(2s) orbitals are filled, with each orbital holding two electrons.<\/li>\n\n\n\n<li>After the \u03c3*(2s) orbital, the next molecular orbitals to be filled are the \u03c3(2pz), followed by the degenerate \u03c0(2px) and \u03c0(2py) orbitals. Each of these orbitals can hold two electrons.<\/li>\n<\/ol>\n\n\n\n<p>In the case of B\u2082, the total of 10 electrons fills the following orbitals:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u03c3(1s) (2 electrons)<\/li>\n\n\n\n<li>\u03c3*(1s) (2 electrons)<\/li>\n\n\n\n<li>\u03c3(2s) (2 electrons)<\/li>\n\n\n\n<li>\u03c3*(2s) (2 electrons)<\/li>\n\n\n\n<li>\u03c3(2pz) (2 electrons)<\/li>\n\n\n\n<li>The remaining electrons fill the degenerate \u03c0(2px) and \u03c0(2py) orbitals. In total, B\u2082 has two unpaired electrons in these \u03c0 orbitals.<\/li>\n<\/ul>\n\n\n\n<p>Thus, <strong>B\u2082 has two unpaired electrons<\/strong>, leading to the correct answer <strong>C. 2<\/strong>. These unpaired electrons are responsible for the paramagnetic properties of the B\u2082 molecule.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Draw the molecular orbital diagram for B2. The number of unpaired electrons in the B2 molecule is _. A. zero B. 1 C. 2 D. 3 E. 4 The correct answer and explanation is: The correct answer is C. 2. Explanation: Boron (B) has an atomic number of 5, which means each boron atom has [&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-264969","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/264969","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=264969"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/264969\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=264969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=264969"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=264969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}