{"id":232612,"date":"2025-06-12T04:25:21","date_gmt":"2025-06-12T04:25:21","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=232612"},"modified":"2025-06-12T04:25:23","modified_gmt":"2025-06-12T04:25:23","slug":"identify-the-following-elements-from-their-electron-configurations","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/12\/identify-the-following-elements-from-their-electron-configurations\/","title":{"rendered":"Identify the following elements from their electron configurations"},"content":{"rendered":"\n

Identify the following elements from their electron configurations: Element A: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 Element B: 1s2 2s2 2p6 3s2 3p4 Element C: 1s2 2s2 2p6 3s1 Element D: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 Element A is Kr; Element B is S, Element C is Na, Element D is Ba Element A is Ne; Element B is O, Element C is Li, Element D is Sr Element A is Kr; Element B is S, Element C is K, Element D is Ca Element A is Ar; Element B is S, Element C is Na, Element D is Ba<\/p>\n\n\n\n

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

Correct Answer:<\/strong>
Element A is Kr; Element B is S; Element C is Na; Element D is Ba<\/strong><\/p>\n\n\n\n

\n\n\n\n

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

To identify elements based on their electron configurations<\/strong>, we analyze how electrons fill the atomic orbitals in the order of increasing energy levels using the Aufbau principle. Here’s a breakdown of each:<\/p>\n\n\n\n

\n\n\n\n

Element A:<\/strong>
Configuration: 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 4s\u00b2 3d\u00b9\u2070 4p\u2076<\/p>\n\n\n\n

    \n
  • Count the electrons: 2 + 2 + 6 + 2 + 6 + 2 + 10 + 6 = 36 electrons<\/strong><\/li>\n\n\n\n
  • The element with atomic number 36 is Krypton (Kr)<\/strong>, a noble gas.
    So, Element A is Kr<\/strong>.<\/li>\n<\/ul>\n\n\n\n
    \n\n\n\n

    Element B:<\/strong>
    Configuration: 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2074<\/p>\n\n\n\n

      \n
    • Count the electrons: 2 + 2 + 6 + 2 + 4 = 16 electrons<\/strong><\/li>\n\n\n\n
    • The element with atomic number 16 is Sulfur (S)<\/strong>, a nonmetal in group 16.
      So, Element B is S<\/strong>.<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n

      Element C:<\/strong>
      Configuration: 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b9<\/p>\n\n\n\n

        \n
      • Count the electrons: 2 + 2 + 6 + 1 = 11 electrons<\/strong><\/li>\n\n\n\n
      • The element with atomic number 11 is Sodium (Na)<\/strong>, an alkali metal.
        So, Element C is Na<\/strong>.<\/li>\n<\/ul>\n\n\n\n
        \n\n\n\n

        Element D:<\/strong>
        Configuration: 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 4s\u00b2 3d\u00b9\u2070 4p\u2076 5s\u00b2 4d\u00b9\u2070 5p\u2076 6s\u00b2<\/p>\n\n\n\n

          \n
        • Count the electrons: 2 + 2 + 6 + 2 + 6 + 2 + 10 + 6 + 2 + 10 + 6 + 2 = 56 electrons<\/strong><\/li>\n\n\n\n
        • The element with atomic number 56 is Barium (Ba)<\/strong>, an alkaline earth metal.
          So, Element D is Ba<\/strong>.<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n

          Final Answer:<\/h3>\n\n\n\n

          \u2705 Element A is Kr; Element B is S; Element C is Na; Element D is Ba<\/strong><\/p>\n\n\n\n

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

          Identify the following elements from their electron configurations: Element A: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 Element B: 1s2 2s2 2p6 3s2 3p4 Element C: 1s2 2s2 2p6 3s1 Element D: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 Element A is Kr; Element B is S, Element C […]<\/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-232612","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/232612","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=232612"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/232612\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=232612"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=232612"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=232612"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}