{"id":213602,"date":"2025-05-11T20:45:21","date_gmt":"2025-05-11T20:45:21","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=213602"},"modified":"2025-05-11T20:45:23","modified_gmt":"2025-05-11T20:45:23","slug":"the-atomic-number-of-oxygen-is-8-because-oxygen-has-9","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/11\/the-atomic-number-of-oxygen-is-8-because-oxygen-has-9\/","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><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>Correct Answer: 8 protons in the nucleus.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>The <strong>atomic number<\/strong> of an element is defined by the <strong>number of protons<\/strong> in the nucleus of one atom of that element. Therefore, <strong>oxygen has an atomic number of 8 because it has 8 protons in its nucleus<\/strong>. This is a fundamental characteristic of every element on the periodic table \u2014 each element has a unique number of protons that determines its identity.<\/p>\n\n\n\n<p>For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Hydrogen<\/strong> has 1 proton \u2192 Atomic number = 1<\/li>\n\n\n\n<li><strong>Carbon<\/strong> has 6 protons \u2192 Atomic number = 6<\/li>\n\n\n\n<li><strong>Oxygen<\/strong> has 8 protons \u2192 Atomic number = 8<\/li>\n<\/ul>\n\n\n\n<p>If an atom gains or loses protons, it <strong>becomes a different element<\/strong> entirely.<\/p>\n\n\n\n<p>Let\u2019s break down the incorrect options:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>&#8220;Electrons in 8 shells&#8221;<\/strong> \u2013 This is incorrect. Oxygen does <strong>not<\/strong> have 8 electron shells. In fact, it only has <strong>2 electron shells<\/strong>. The first shell holds 2 electrons and the second shell holds the remaining 6 electrons, making a total of 8 electrons in a <strong>neutral<\/strong> oxygen atom.<\/li>\n\n\n\n<li><strong>&#8220;A second shell with 8 electrons&#8221;<\/strong> \u2013 This is incorrect because oxygen&#8217;s second shell only has <strong>6 electrons<\/strong>, not 8. The second shell <strong>can hold up to 8 electrons<\/strong>, but oxygen has only 6 there, which is why it readily forms bonds (e.g., in H\u2082O) to fill this outer shell.<\/li>\n\n\n\n<li><strong>&#8220;An atomic mass of 8&#8221;<\/strong> \u2013 This is also incorrect. Oxygen has an atomic <strong>mass<\/strong> of approximately <strong>16 atomic mass units (amu)<\/strong>. The mass is the sum of <strong>protons and neutrons<\/strong>, so with 8 protons and typically 8 neutrons, the mass rounds to 16.<\/li>\n<\/ol>\n\n\n\n<p>In summary, the atomic number of oxygen is 8 because <strong>it has 8 protons in its nucleus<\/strong>, and this is the defining trait that classifies it as the element oxygen on the periodic table.<\/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: Correct Answer: 8 protons in the nucleus. Explanation: The atomic number of an element is defined by the number of protons in [&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-213602","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/213602","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=213602"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/213602\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=213602"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=213602"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=213602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}