{"id":211421,"date":"2025-05-03T20:49:45","date_gmt":"2025-05-03T20:49:45","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=211421"},"modified":"2025-05-03T20:49:47","modified_gmt":"2025-05-03T20:49:47","slug":"which-of-the-following-does-not-have-eight-valence-electrons","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/03\/which-of-the-following-does-not-have-eight-valence-electrons\/","title":{"rendered":"Which of the following does not have eight valence electrons"},"content":{"rendered":"\n<p>Which of the following does not have eight valence electrons?<\/p>\n\n\n\n<p>Cl-<br>Xe<br>Ti+4<br>Rb+<br>Sr+<\/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><strong>Correct Answer: Ti\u2074\u207a (Titanium ion with a +4 charge)<\/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>Valence electrons are the electrons in the outermost shell of an atom that are available for bonding. A full outer shell\u2014often 8 electrons\u2014is associated with the <strong>&#8220;octet rule&#8221;<\/strong>, which states that atoms tend to gain, lose, or share electrons in order to achieve a stable configuration similar to that of noble gases.<\/p>\n\n\n\n<p>Let\u2019s analyze each option:<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Cl\u207b (Chloride ion):<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Neutral chlorine (Cl) has 7 valence electrons.<\/li>\n\n\n\n<li>When it gains 1 electron to become Cl\u207b, it now has <strong>8 valence electrons<\/strong>.<\/li>\n\n\n\n<li><strong>It follows the octet rule. \u2705<\/strong><\/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>2. Xe (Xenon):<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Xenon is a noble gas with the electron configuration [Kr]5s\u00b24d\u00b9\u20705p\u2076.<\/li>\n\n\n\n<li>It has <strong>8 valence electrons (2 in 5s and 6 in 5p)<\/strong>.<\/li>\n\n\n\n<li><strong>Already stable and follows the octet rule. \u2705<\/strong><\/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>3. Ti\u2074\u207a (Titanium ion):<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Titanium (atomic number 22) has the electron configuration: [Ar] 4s\u00b2 3d\u00b2.<\/li>\n\n\n\n<li>As a <strong>neutral atom<\/strong>, it has 4 valence electrons (2 in 4s and 2 in 3d).<\/li>\n\n\n\n<li>When it <strong>loses 4 electrons<\/strong> to become Ti\u2074\u207a, it loses all its valence electrons.<\/li>\n\n\n\n<li>Its configuration becomes [Ar] \u2014 a noble gas core, <strong>but Ti\u2074\u207a has 0 valence electrons<\/strong>.<\/li>\n\n\n\n<li><strong>Therefore, Ti\u2074\u207a does NOT have 8 valence electrons. \u274c<\/strong><\/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>4. Rb\u207a (Rubidium ion):<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Neutral rubidium (Rb) has 1 valence electron (5s\u00b9).<\/li>\n\n\n\n<li>When it loses 1 electron to become Rb\u207a, its configuration becomes [Kr].<\/li>\n\n\n\n<li>Now, the outer shell is the filled 4p\u2076 orbital \u2014 <strong>8 valence electrons<\/strong>.<\/li>\n\n\n\n<li><strong>Follows the octet rule. \u2705<\/strong><\/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>5. Sr\u207a (Strontium ion with +1 charge):<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Neutral Sr has 2 valence electrons (5s\u00b2).<\/li>\n\n\n\n<li>Sr\u207a loses 1 electron \u2192 configuration becomes [Kr]5s\u00b9.<\/li>\n\n\n\n<li>This ion has only <strong>1 valence electron<\/strong>, so <strong>it does not follow the octet rule. \u274c<\/strong><\/li>\n\n\n\n<li>However, <strong>Sr typically forms a +2 ion (Sr\u00b2\u207a), not Sr\u207a<\/strong>.<\/li>\n\n\n\n<li>Still, <strong>in this question, Sr\u207a has fewer than 8 valence electrons.<\/strong><\/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>So why is Ti\u2074\u207a the correct answer over Sr\u207a?<\/strong><\/h3>\n\n\n\n<p>Ti\u2074\u207a has <strong>no valence electrons at all<\/strong>, whereas Sr\u207a still has <strong>1 valence electron<\/strong>. The question asks which <strong>does not have 8 valence electrons<\/strong>, and <strong>Ti\u2074\u207a is the most extreme case<\/strong>, with <strong>zero<\/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>Final Answer: Ti\u2074\u207a<\/strong><\/h3>\n","protected":false},"excerpt":{"rendered":"<p>Which of the following does not have eight valence electrons? Cl-XeTi+4Rb+Sr+ The correct answer and explanation is : Correct Answer: Ti\u2074\u207a (Titanium ion with a +4 charge) Explanation: Valence electrons are the electrons in the outermost shell of an atom that are available for bonding. A full outer shell\u2014often 8 electrons\u2014is associated with the &#8220;octet [&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-211421","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/211421","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=211421"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/211421\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=211421"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=211421"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=211421"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}