{"id":197071,"date":"2025-03-06T14:30:40","date_gmt":"2025-03-06T14:30:40","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=197071"},"modified":"2025-03-06T14:34:04","modified_gmt":"2025-03-06T14:34:04","slug":"give-the-number-of-core-electrons-for-cd","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/06\/give-the-number-of-core-electrons-for-cd\/","title":{"rendered":"Give the number of core electrons for Cd"},"content":{"rendered":"\n

Give the number of core electrons for Cd<\/p>\n\n\n\n

A) 48 <\/p>\n\n\n\n

B) 44 <\/p>\n\n\n\n

C) 46 <\/p>\n\n\n\n

D) 47 <\/p>\n\n\n\n

E) 45<\/p>\n\n\n\n

The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n

The correct answer is B) 44 core electrons<\/strong>.<\/p>\n\n\n\n

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

To determine the number of core electrons in cadmium (Cd<\/strong>, atomic number 48<\/strong>), follow these steps:<\/p>\n\n\n\n

Step 1: Identify the Atomic Number<\/strong><\/h4>\n\n\n\n

Cadmium has an atomic number of 48<\/strong>, meaning it has 48 total electrons<\/strong> in its neutral state.<\/p>\n\n\n\n

Step 2: Write the Electron Configuration<\/strong><\/h4>\n\n\n\n

The full electron configuration of cadmium (Cd<\/strong>) is:<\/p>\n\n\n\n

[
1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6 4d^{10} 5s^2
]<\/p>\n\n\n\n

Alternatively, using noble gas notation:<\/p>\n\n\n\n

[
[\\text{Kr}] 4d^{10} 5s^2
]<\/p>\n\n\n\n

Step 3: Identify Core and Valence Electrons<\/strong><\/h4>\n\n\n\n
    \n
  • Core electrons<\/strong>: These are the electrons in all inner shells, excluding the outermost shell.<\/li>\n\n\n\n
  • Valence electrons<\/strong>: These are the electrons in the outermost shell that participate in bonding.<\/li>\n<\/ul>\n\n\n\n

    For cadmium:<\/p>\n\n\n\n

      \n
    • The outermost shell is n = 5<\/strong>, which contains 5s\u00b2<\/strong> electrons.<\/li>\n\n\n\n
    • All other electrons (from n = 1, 2, 3, 4<\/strong>) are core electrons<\/strong>.<\/li>\n<\/ul>\n\n\n\n

      Step 4: Count the Core Electrons<\/strong><\/h4>\n\n\n\n
        \n
      • Total electrons = 48<\/strong><\/li>\n\n\n\n
      • Valence electrons = 2 (from 5s\u00b2)<\/strong><\/li>\n\n\n\n
      • Core electrons = 48 – 2 = 44<\/strong><\/li>\n<\/ul>\n\n\n\n

        Thus, cadmium has 44 core electrons<\/strong>.<\/p>\n\n\n\n

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

        The correct answer is B) 44 core electrons<\/strong>. This is because only the two 5s electrons<\/strong> are considered valence electrons, while all others are part of the inner, core shells.<\/p>\n\n\n\n

        \"\"<\/figure>\n\n\n\n

        Here is an educational diagram illustrating the electron configuration of cadmium (Cd), highlighting the core electrons (44) and valence electrons (2). <\/p>\n","protected":false},"excerpt":{"rendered":"

        Give the number of core electrons for Cd A) 48 B) 44 C) 46 D) 47 E) 45 The correct answer and explanation is : The correct answer is B) 44 core electrons. Explanation: To determine the number of core electrons in cadmium (Cd, atomic number 48), follow these steps: Step 1: Identify the Atomic […]<\/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-197071","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/197071","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=197071"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/197071\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=197071"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=197071"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=197071"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}