{"id":248148,"date":"2025-07-08T07:42:31","date_gmt":"2025-07-08T07:42:31","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=248148"},"modified":"2025-07-08T07:42:33","modified_gmt":"2025-07-08T07:42:33","slug":"two-elements-have-the-following-of-electrons","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/08\/two-elements-have-the-following-of-electrons\/","title":{"rendered":"Two elements have the following # of electrons"},"content":{"rendered":"\n

two elements have the following # of electrons: K=19 & F=9. What kind of bond will they form & what is the formula of the resulting compound? A. Ionic, KF B. Covalent, KF C. Ionic, KF2 D. Polar covalent, KF2 E. Hydrogen, KF<\/p>\n\n\n\n

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

The two elements in question are K<\/strong> (Potassium) with 19 electrons and F<\/strong> (Fluorine) with 9 electrons.<\/p>\n\n\n\n

    \n
  1. Electron Configuration and Bond Type:<\/strong>\n
      \n
    • Potassium (K) is an alkali metal with an electron configuration of [Ar] 4s\u00b9. Potassium has one electron in its outermost shell, which it can easily lose to achieve a stable electron configuration, similar to noble gases.<\/li>\n\n\n\n
    • Fluorine (F) is a halogen with an electron configuration of [He] 2s\u00b2 2p\u2075. Fluorine has seven electrons in its outer shell and needs one more electron to complete its valence shell, achieving the stable electron configuration of a noble gas (Neon).<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n

      Given these electron configurations, K<\/strong> will lose its single valence electron, and F<\/strong> will gain it. This creates an ion pair<\/strong>: Potassium becomes a K\u207a<\/strong> ion (positive charge) and Fluorine becomes an F\u207b<\/strong> ion (negative charge).<\/p>\n\n\n\n

        \n
      1. Ionic Bond Formation:<\/strong>
        Since Potassium is a metal and Fluorine is a nonmetal, they will form an ionic bond<\/strong>. Ionic bonds typically form when a metal atom donates electrons to a nonmetal atom, creating oppositely charged ions that are attracted to each other by electrostatic forces.<\/li>\n\n\n\n
      2. Formula of the Compound:<\/strong>
        When K loses one electron and F gains one, the simplest ratio of potassium ions to fluorine ions will be 1:1<\/strong>. Thus, the resulting ionic compound will have the formula KF<\/strong>.<\/li>\n\n\n\n
      3. Conclusion:<\/strong>
        The correct answer is A. Ionic, KF<\/strong> because Potassium (K) and Fluorine (F) will form an ionic bond, and the chemical formula of the resulting compound is KF<\/strong>.<\/li>\n<\/ol>\n\n\n\n

        Why the Other Choices are Incorrect:<\/h3>\n\n\n\n
          \n
        • B. Covalent, KF<\/strong>: Covalent bonds occur between nonmetals sharing electrons, not between a metal and a nonmetal.<\/li>\n\n\n\n
        • C. Ionic, KF\u2082<\/strong>: There\u2019s no need for two fluoride ions to balance the charge of one potassium ion.<\/li>\n\n\n\n
        • D. Polar covalent, KF\u2082<\/strong>: Polar covalent bonds are a type of covalent bond between two nonmetals with different electronegativities, but potassium and fluorine will form an ionic bond, not covalent.<\/li>\n\n\n\n
        • E. Hydrogen, KF<\/strong>: Hydrogen bonds occur between molecules, not within ionic compounds.<\/li>\n<\/ul>\n\n\n\n

          Thus, A. Ionic, KF<\/strong> is the correct answer.<\/p>\n\n\n\n

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

          two elements have the following # of electrons: K=19 & F=9. What kind of bond will they form & what is the formula of the resulting compound? A. Ionic, KF B. Covalent, KF C. Ionic, KF2 D. Polar covalent, KF2 E. Hydrogen, KF The Correct Answer and Explanation is: The two elements in question are […]<\/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-248148","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/248148","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=248148"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/248148\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=248148"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=248148"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=248148"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}