{"id":234275,"date":"2025-06-14T03:24:44","date_gmt":"2025-06-14T03:24:44","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=234275"},"modified":"2025-06-14T03:24:46","modified_gmt":"2025-06-14T03:24:46","slug":"write-the-electron-configuration-for-phosphorus-and-underline-the-valence-electrons","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/14\/write-the-electron-configuration-for-phosphorus-and-underline-the-valence-electrons\/","title":{"rendered":"Write the electron configuration for phosphorus and underline the valence electrons."},"content":{"rendered":"\n

Write the electron configuration for phosphorus and underline the valence electrons. 1s
2s
2p
3s
3p
1s
2s
2p
3s
3p
1s
2s
2p
3s
3p
1s
2s
2p
3s
3p<\/p>\n\n\n\n

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

Electron Configuration for Phosphorus (P):<\/strong><\/p>\n\n\n\n

Phosphorus has an atomic number of 15, meaning it has 15 electrons in its neutral state. The electron configuration is written by filling orbitals in order of increasing energy levels.<\/p>\n\n\n\n

Electron configuration:<\/strong><\/p>\n\n\n\n

1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u00b3<\/strong><\/p>\n\n\n\n

Valence electrons (underlined):<\/strong>
1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u00b3<\/em><\/strong><\/p>\n\n\n\n

\n\n\n\n

Explanation:<\/h3>\n\n\n\n

The electron configuration of an element describes the distribution of its electrons among the various atomic orbitals. Phosphorus, with an atomic number of 15, has 15 electrons arranged in a specific order based on the Aufbau principle<\/em>, Pauli exclusion principle<\/em>, and Hund\u2019s rule<\/em>. These rules govern how electrons occupy orbitals:<\/p>\n\n\n\n

    \n
  1. Aufbau Principle<\/strong>: Electrons fill orbitals starting from the lowest energy level.<\/li>\n\n\n\n
  2. Pauli Exclusion Principle<\/strong>: Each orbital can hold a maximum of two electrons with opposite spins.<\/li>\n\n\n\n
  3. Hund\u2019s Rule<\/strong>: Electrons will fill degenerate orbitals (orbitals of the same energy) singly first before pairing up.<\/li>\n<\/ol>\n\n\n\n

    Beginning with the lowest energy orbital:<\/p>\n\n\n\n

      \n
    • The 1s orbital<\/strong> is filled first: 2 electrons \u2192 1s\u00b2<\/li>\n\n\n\n
    • Then the 2s orbital<\/strong>: 2 electrons \u2192 2s\u00b2<\/li>\n\n\n\n
    • Next, the 2p orbital<\/strong>: 6 electrons \u2192 2p\u2076<\/li>\n\n\n\n
    • Followed by the 3s orbital<\/strong>: 2 electrons \u2192 3s\u00b2<\/li>\n\n\n\n
    • Finally, the 3p orbital<\/strong>: 3 electrons \u2192 3p\u00b3<\/li>\n<\/ul>\n\n\n\n

      This gives the full configuration as 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u00b3<\/strong>.<\/p>\n\n\n\n

      The valence electrons<\/strong> are the electrons located in the outermost shell<\/strong>, which for phosphorus is the third energy level (n = 3). These include the electrons in the 3s and 3p orbitals, totaling 5 valence electrons<\/strong> (3s\u00b2 3p\u00b3<\/strong>). Valence electrons play a critical role in chemical bonding and reactivity.<\/p>\n\n\n\n

      \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

      Write the electron configuration for phosphorus and underline the valence electrons. 1s2s2p3s3p1s2s2p3s3p1s2s2p3s3p1s2s2p3s3p The Correct Answer and Explanation is: Electron Configuration for Phosphorus (P): Phosphorus has an atomic number of 15, meaning it has 15 electrons in its neutral state. The electron configuration is written by filling orbitals in order of increasing energy levels. Electron configuration: […]<\/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-234275","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/234275","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=234275"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/234275\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=234275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=234275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=234275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}