{"id":215690,"date":"2025-05-17T14:24:24","date_gmt":"2025-05-17T14:24:24","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=215690"},"modified":"2025-05-17T14:38:45","modified_gmt":"2025-05-17T14:38:45","slug":"write-the-quantum-numbers-for-the-4th-and-8th-electron-of-oxygen-o-atom","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/17\/write-the-quantum-numbers-for-the-4th-and-8th-electron-of-oxygen-o-atom\/","title":{"rendered":"Write the quantum numbers for the 4th and 8th electron of Oxygen (O) atom."},"content":{"rendered":"\n

Write the quantum numbers for the 4th and 8th electron of Oxygen (O) atom.<\/p>\n\n\n\n

Arrange each set in order of decreasing atomic size:<\/p>\n\n\n\n

(a) Cl, K, S<\/p>\n\n\n\n

(b) Mg, K, Ca<\/p>\n\n\n\n

(c) F, Ne, Na<\/p>\n\n\n\n

(d) Be, Mg, Na<\/p>\n\n\n\n

and arrange each set of atoms in order of decreasing IE1:<\/p>\n\n\n\n

(a) Na, Li, K
(b) Be, F, C
(c) Cl, Ar, Na
(d) Cl, Br, Se<\/p>\n\n\n\n

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

Let’s tackle the questions in two parts:<\/p>\n\n\n\n

\n\n\n\n

1. Write the quantum numbers for the 4th and 8th electron of Oxygen (O) atom.<\/strong><\/h3>\n\n\n\n

Oxygen (Atomic number 8):<\/strong>
Electron configuration: 1s\u00b2 2s\u00b2 2p\u2074<\/strong><\/p>\n\n\n\n

    \n
  • 4th electron:<\/strong>
    This electron goes into the 2s<\/strong> subshell.
    • n (principal quantum number):<\/strong> 2 (second shell)<\/li>
    • l (azimuthal\/angular momentum):<\/strong> 0 (s-orbital)<\/li>
    • ml (magnetic quantum number):<\/strong> 0 (only one value for l = 0)<\/li>
    • ms (spin quantum number):<\/strong> \u2013\u00bd (since it’s the second electron in 2s, it pairs with the first)<\/li><\/ul>\u2705 Quantum numbers:<\/strong> (2, 0, 0, \u2013\u00bd)<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n

      2. Arrange each set in order of decreasing atomic size and decreasing first ionization energy (IE\u2081):<\/strong><\/h3>\n\n\n\n

      Atomic Size:<\/strong><\/h4>\n\n\n\n

      First Ionization Energy (IE\u2081):<\/strong><\/h4>\n\n\n\n

      IE\u2081 is the energy needed to remove an electron from a gaseous atom. It increases across a period<\/strong> and decreases down a group<\/strong><\/p>\n\n\n\n

      \n\n\n\n

      Conclusion:<\/strong><\/h3>\n\n\n\n

      Understanding quantum numbers helps determine an electron\u2019s position and spin in an atom. The periodic trends in atomic size<\/strong> and ionization energy<\/strong> reflect the atomic structure and nuclear charge. Atomic size increases down a group and decreases across a period. Ionization energy follows the opposite trend because electrons are more tightly bound in smaller atoms with higher nuclear charge. This knowledge is essential in predicting chemical behavior and reactivity of elements.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Write the quantum numbers for the 4th and 8th electron of Oxygen (O) atom. Arrange each set in order of decreasing atomic size: (a) Cl, K, S (b) Mg, K, Ca (c) F, Ne, Na (d) Be, Mg, Na and arrange each set of atoms in order of decreasing IE1: (a) Na, Li, K(b) Be, […]<\/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-215690","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/215690","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=215690"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/215690\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=215690"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=215690"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=215690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}