{"id":202860,"date":"2025-03-18T07:58:46","date_gmt":"2025-03-18T07:58:46","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=202860"},"modified":"2025-03-18T07:58:49","modified_gmt":"2025-03-18T07:58:49","slug":"which-statement-is-true-7","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/18\/which-statement-is-true-7\/","title":{"rendered":"Which statement is TRUE"},"content":{"rendered":"\n

Which statement is TRUE?
An atom of Carbon-14 contains 6 protons, 8 neutrons, 6 electrons in its nucleus.
An atom of Bromine-79 contains 79 protons, 44 neutrons, 35 electrons.
lons are formed by changing the number of protons in an atom’s nucleus.
1602- has 10 electrons.
The number of protons and neutrons is always the same in the neutral atom.<\/p>\n\n\n\n

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

The correct statement is:<\/p>\n\n\n\n

( \\text{O}^{2-} ) has 10 electrons.<\/strong><\/p>\n\n\n\n

Explanation:<\/h3>\n\n\n\n
    \n
  1. Why is ( \\text{O}^{2-} ) having 10 electrons correct?<\/strong><\/li>\n<\/ol>\n\n\n\n
      \n
    • The element oxygen (O)<\/strong> has an atomic number of 8<\/strong>, meaning a neutral oxygen atom has 8 protons and 8 electrons<\/strong>.<\/li>\n\n\n\n
    • The ( O^{2-} )<\/strong> ion means the oxygen atom has gained 2 extra electrons<\/strong> to form a stable octet configuration.<\/li>\n\n\n\n
    • Thus, the total number of electrons in ( O^{2-} ) is 8 + 2 = 10<\/strong>.<\/li>\n<\/ul>\n\n\n\n
        \n
      1. Why are the other statements incorrect?<\/strong><\/li>\n<\/ol>\n\n\n\n
          \n
        • “An atom of Carbon-14 contains 6 protons, 8 neutrons, 6 electrons in its nucleus.”<\/strong>\n
            \n
          • Incorrect:<\/strong> Carbon-14 (( ^{14}C )) has 6 protons and 8 neutrons<\/strong>, but electrons are not found in the nucleus<\/strong>; they orbit the nucleus.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
          • “An atom of Bromine-79 contains 79 protons, 44 neutrons, 35 electrons.”<\/strong>\n
              \n
            • Incorrect:<\/strong> Bromine (( ^{79}Br )) has an atomic number of 35<\/strong>, meaning it has 35 protons<\/strong> (not 79).<\/li>\n\n\n\n
            • Its mass number is 79, so the number of neutrons is 79 – 35 = 44<\/strong>, which is correct.<\/li>\n\n\n\n
            • However, the incorrect proton count makes the whole statement false.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
            • “Ions are formed by changing the number of protons in an atom\u2019s nucleus.”<\/strong>\n
                \n
              • Incorrect:<\/strong> Ions are formed by gaining or losing electrons<\/strong>, not by changing the number of protons.<\/li>\n\n\n\n
              • Changing the proton number would result in a completely different element<\/strong>, not just an ion.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
              • “The number of protons and neutrons is always the same in a neutral atom.”<\/strong>\n
                  \n
                • Incorrect:<\/strong> While protons always remain the same for a given element, neutrons can vary (e.g., isotopes like Carbon-12 and Carbon-14 have different neutron counts).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n

                  Thus, ( O^{2-} ) having 10 electrons is the only true statement.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

                  Which statement is TRUE?An atom of Carbon-14 contains 6 protons, 8 neutrons, 6 electrons in its nucleus.An atom of Bromine-79 contains 79 protons, 44 neutrons, 35 electrons.lons are formed by changing the number of protons in an atom’s nucleus.1602- has 10 electrons.The number of protons and neutrons is always the same in the neutral atom. […]<\/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-202860","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/202860","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=202860"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/202860\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=202860"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=202860"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=202860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}