{"id":158659,"date":"2024-10-30T10:02:01","date_gmt":"2024-10-30T10:02:01","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=158659"},"modified":"2024-10-30T10:02:03","modified_gmt":"2024-10-30T10:02:03","slug":"this-question-is-about-atoms-and-isotopes","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2024\/10\/30\/this-question-is-about-atoms-and-isotopes\/","title":{"rendered":"This question is about atoms and isotopes."},"content":{"rendered":"\n<p>This question is about atoms and isotopes. 4 <\/p>\n\n\n\n<p>(a) Atoms contain protons, neutrons and electrons. A lithium atom has the symbol 7 3 Li Explain, in terms of sub-atomic particles, why the mass number of this lithium atom is 7. Because this lithium atom has 3 protons and 4 neutrons mass number is total of neutrons and protons<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>To explain why the mass number of the lithium atom is 7, represented by the symbol ( ^7_3Li ), we first need to understand the basic structure of an atom and the role of subatomic particles, which are protons, neutrons, and electrons.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Understanding Atomic Structure<\/strong>: Atoms are composed of three primary types of subatomic particles:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Protons<\/strong>: Positively charged particles found in the nucleus of the atom. The number of protons defines the element and is known as the atomic number.<\/li>\n\n\n\n<li><strong>Neutrons<\/strong>: Neutral particles that also reside in the nucleus. Neutrons contribute to the mass of the atom but do not affect its chemical properties.<\/li>\n\n\n\n<li><strong>Electrons<\/strong>: Negatively charged particles that orbit the nucleus in electron shells. Electrons are involved in chemical bonding but have negligible mass compared to protons and neutrons.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Mass Number Definition<\/strong>: The mass number of an atom is the total count of protons and neutrons in its nucleus. This number reflects the atom&#8217;s mass because protons and neutrons are significantly more massive than electrons.<\/li>\n\n\n\n<li><strong>Analyzing Lithium ( ^7_3Li )<\/strong>: In the case of lithium, the notation ( ^7_3Li ) indicates that this particular lithium atom has:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>3 Protons<\/strong>: The lower number (3) indicates the atomic number of lithium, which defines it as lithium since it has three protons.<\/li>\n\n\n\n<li><strong>4 Neutrons<\/strong>: To find the number of neutrons, we subtract the number of protons from the mass number. Since the mass number is 7 (the upper number), the calculation is as follows:<br>[<br>\\text{Neutrons} = \\text{Mass Number} &#8211; \\text{Protons} = 7 &#8211; 3 = 4<br>]<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Conclusion<\/strong>: Therefore, the mass number of the lithium atom is 7 because it has a total of 3 protons and 4 neutrons. This combination yields the mass number, which is a fundamental concept in understanding atomic mass and the identity of elements. Thus, the lithium atom, represented as ( ^7_3Li ), showcases the relationship between protons, neutrons, and mass number in atomic structure.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>This question is about atoms and isotopes. 4 (a) Atoms contain protons, neutrons and electrons. A lithium atom has the symbol 7 3 Li Explain, in terms of sub-atomic particles, why the mass number of this lithium atom is 7. Because this lithium atom has 3 protons and 4 neutrons mass number is total 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-158659","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/158659","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=158659"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/158659\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=158659"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=158659"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=158659"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}