{"id":223134,"date":"2025-06-01T09:16:38","date_gmt":"2025-06-01T09:16:38","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=223134"},"modified":"2025-06-01T09:16:40","modified_gmt":"2025-06-01T09:16:40","slug":"write-the-isoelectronic-pair-among-na-cl-f-li","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/01\/write-the-isoelectronic-pair-among-na-cl-f-li\/","title":{"rendered":"Write the isoelectronic pair among Na+, Cl-, F-, Li+."},"content":{"rendered":"\n

Question
Write the isoelectronic pair among Na+, Cl-, F-, Li+.<\/p>\n\n\n\n

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

Correct Answer:<\/strong><\/p>\n\n\n\n

The isoelectronic pair among Na\u207a, Cl\u207b, F\u207b, and Li\u207a is Na\u207a and F\u207b<\/strong>.<\/p>\n\n\n\n

\n\n\n\n

Explanation<\/strong><\/h3>\n\n\n\n

Isoelectronic species<\/strong> are atoms or ions that have the same number of electrons<\/strong> and hence the same electron configuration<\/strong>, though they may have different nuclear charges.<\/p>\n\n\n\n

Let\u2019s examine each species:<\/p>\n\n\n\n

    \n
  1. Na\u207a (Sodium ion):<\/strong>\n
      \n
    • Atomic number of Na = 11<\/li>\n\n\n\n
    • Loses 1 electron \u2192 electrons = 11 \u2013 1 = 10<\/strong><\/li>\n<\/ul>\n<\/li>\n\n\n\n
    • Cl\u207b (Chloride ion):<\/strong>\n
        \n
      • Atomic number of Cl = 17<\/li>\n\n\n\n
      • Gains 1 electron \u2192 electrons = 17 + 1 = 18<\/strong><\/li>\n<\/ul>\n<\/li>\n\n\n\n
      • F\u207b (Fluoride ion):<\/strong>\n
          \n
        • Atomic number of F = 9<\/li>\n\n\n\n
        • Gains 1 electron \u2192 electrons = 9 + 1 = 10<\/strong><\/li>\n<\/ul>\n<\/li>\n\n\n\n
        • Li\u207a (Lithium ion):<\/strong>\n
            \n
          • Atomic number of Li = 3<\/li>\n\n\n\n
          • Loses 1 electron \u2192 electrons = 3 \u2013 1 = 2<\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n

            Now compare the number of electrons:<\/p>\n\n\n\n

              \n
            • Na\u207a = 10<\/li>\n\n\n\n
            • F\u207b = 10<\/li>\n\n\n\n
            • Cl\u207b = 18<\/li>\n\n\n\n
            • Li\u207a = 2<\/li>\n<\/ul>\n\n\n\n

              Clearly, Na\u207a and F\u207b<\/strong> both have 10 electrons<\/strong> and are therefore isoelectronic<\/strong>. Despite having different nuclear charges (Na has 11 protons, F has 9), the electron configuration is the same:
              1s\u00b2 2s\u00b2 2p\u2076<\/strong> \u2014 the configuration of Neon (Ne)<\/strong>.<\/p>\n\n\n\n

              It\u2019s important to note that although isoelectronic species have the same electron configuration, they can have different chemical and physical properties due to differences in nuclear charge (Z). A higher nuclear charge pulls electrons in more tightly, resulting in a smaller ionic radius. For example, Na\u207a is smaller than F\u207b even though both have 10 electrons, because Na\u207a has more protons pulling on the same number of electrons.<\/p>\n\n\n\n

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

              Na\u207a and F\u207b<\/strong> are isoelectronic because they both have 10 electrons and share the same electron configuration.<\/p>\n\n\n\n

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

              QuestionWrite the isoelectronic pair among Na+, Cl-, F-, Li+. The Correct Answer and Explanation is: Correct Answer: The isoelectronic pair among Na\u207a, Cl\u207b, F\u207b, and Li\u207a is Na\u207a and F\u207b. Explanation Isoelectronic species are atoms or ions that have the same number of electrons and hence the same electron configuration, though they may have different […]<\/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-223134","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/223134","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=223134"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/223134\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=223134"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=223134"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=223134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}