{"id":202326,"date":"2025-03-17T11:31:46","date_gmt":"2025-03-17T11:31:46","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=202326"},"modified":"2025-03-17T11:31:48","modified_gmt":"2025-03-17T11:31:48","slug":"the-atomic-number-of-oxygen-is-8-because-oxygen-has-2","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/17\/the-atomic-number-of-oxygen-is-8-because-oxygen-has-2\/","title":{"rendered":"The atomic number of oxygen is 8 because oxygen has"},"content":{"rendered":"\n<p>The atomic number of oxygen is 8 because oxygen has?<\/p>\n\n\n\n<p>8 protons in the nucleus.<br>electrons in 8 shells.<br>a second shell with 8 electrons.<br>an atomic mass of 8.<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>The correct answer is: <strong>8 protons in the nucleus<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>The <strong>atomic number<\/strong> of an element refers to the number of <strong>protons<\/strong> in the nucleus of an atom of that element. In the case of <strong>oxygen<\/strong>, its atomic number is <strong>8<\/strong>, which means every oxygen atom has <strong>8 protons<\/strong> in its nucleus. This number is what defines the element as oxygen and distinguishes it from other elements on the periodic table.<\/p>\n\n\n\n<p>The number of protons in an atom is also equal to the number of <strong>electrons<\/strong> in a neutral atom. Thus, oxygen also has <strong>8 electrons<\/strong> surrounding its nucleus. These electrons are arranged in electron shells (energy levels) around the nucleus. For oxygen, these 8 electrons are arranged in <strong>two shells<\/strong>: the first shell contains <strong>2 electrons<\/strong>, and the second shell contains <strong>6 electrons<\/strong>.<\/p>\n\n\n\n<p>To further clarify the incorrect options:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Electrons in 8 shells<\/strong>: This statement is not correct. Oxygen only has <strong>2 electron shells<\/strong>, not 8. The second shell holds 6 electrons, and the first shell holds 2 electrons.<\/li>\n\n\n\n<li><strong>A second shell with 8 electrons<\/strong>: While oxygen has 8 electrons in total, only <strong>6 electrons<\/strong> are found in the second shell. The first shell contains 2 electrons. Therefore, this statement is incorrect.<\/li>\n\n\n\n<li><strong>An atomic mass of 8<\/strong>: This is incorrect as well. The <strong>atomic mass<\/strong> (or atomic weight) of oxygen is not exactly 8; it is approximately <strong>16<\/strong>. The atomic mass is the sum of the number of protons and neutrons in an atom&#8217;s nucleus. Oxygen&#8217;s most common isotope has <strong>8 protons<\/strong> and <strong>8 neutrons<\/strong>, giving it an atomic mass of about <strong>16<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Thus, the defining characteristic of oxygen&#8217;s atomic number being <strong>8<\/strong> comes from the presence of <strong>8 protons<\/strong> in the nucleus, which is the primary determinant of an element&#8217;s identity.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The atomic number of oxygen is 8 because oxygen has? 8 protons in the nucleus.electrons in 8 shells.a second shell with 8 electrons.an atomic mass of 8. The correct answer and explanation is : The correct answer is: 8 protons in the nucleus. Explanation: The atomic number of an element refers to the number of [&hellip;]<\/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-202326","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/202326","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=202326"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/202326\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=202326"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=202326"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=202326"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}