{"id":239075,"date":"2025-07-02T18:17:00","date_gmt":"2025-07-02T18:17:00","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=239075"},"modified":"2025-07-02T18:17:02","modified_gmt":"2025-07-02T18:17:02","slug":"how-many-electrons-protons-and-neutrons-are-in-neon-21","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/02\/how-many-electrons-protons-and-neutrons-are-in-neon-21\/","title":{"rendered":"How many electrons, protons, and neutrons are in neon-21"},"content":{"rendered":"\n<p>How many electrons, protons, and neutrons are in neon-21? Put electrons: 10 first, then protons: 10 then neutrons: 10<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>For <strong>neon-21<\/strong>, the isotope of neon with a mass number of 21, here&#8217;s how the subatomic particles are distributed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Electrons: 10<\/strong><\/li>\n\n\n\n<li><strong>Protons: 10<\/strong><\/li>\n\n\n\n<li><strong>Neutrons: 11<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>Neon is element number <strong>10<\/strong> on the periodic table, which means that in its neutral state, it has <strong>10 protons<\/strong> and <strong>10 electrons<\/strong>. These are the defining numbers for the element, as the number of protons (atomic number) is what distinguishes one element from another.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Electrons<\/strong>: In a neutral atom, the number of electrons equals the number of protons, so neon-21 has <strong>10 electrons<\/strong>.<\/li>\n\n\n\n<li><strong>Protons<\/strong>: Since neon is atomic number 10, it has <strong>10 protons<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Now, to determine the number of <strong>neutrons<\/strong>, we need to consider the <strong>mass number<\/strong>. The mass number is the sum of protons and neutrons in an atom&#8217;s nucleus. For neon-21, the mass number is <strong>21<\/strong>. Since the atom has <strong>10 protons<\/strong>, the number of neutrons can be calculated as:Neutrons=Mass&nbsp;number\u2212Number&nbsp;of&nbsp;protons=21\u221210=11\\text{Neutrons} = \\text{Mass number} &#8211; \\text{Number of protons} = 21 &#8211; 10 = 11Neutrons=Mass&nbsp;number\u2212Number&nbsp;of&nbsp;protons=21\u221210=11<\/p>\n\n\n\n<p>Thus, <strong>neon-21<\/strong> has <strong>11 neutrons<\/strong>.<\/p>\n\n\n\n<p>In summary, <strong>neon-21<\/strong> has:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>10 electrons<\/strong><\/li>\n\n\n\n<li><strong>10 protons<\/strong><\/li>\n\n\n\n<li><strong>11 neutrons<\/strong><\/li>\n<\/ul>\n\n\n\n<p>This distribution follows from the basic principles of atomic structure, where the protons determine the element, the neutrons vary in isotopes, and the electrons balance the charge of a neutral atom.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/07\/learnexams-banner5.jpeg\" alt=\"\" class=\"wp-image-239131\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>How many electrons, protons, and neutrons are in neon-21? Put electrons: 10 first, then protons: 10 then neutrons: 10 The Correct Answer and Explanation is: For neon-21, the isotope of neon with a mass number of 21, here&#8217;s how the subatomic particles are distributed: Explanation: Neon is element number 10 on the periodic table, which [&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-239075","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/239075","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=239075"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/239075\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=239075"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=239075"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=239075"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}