{"id":236670,"date":"2025-06-16T12:10:48","date_gmt":"2025-06-16T12:10:48","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=236670"},"modified":"2025-06-16T12:10:49","modified_gmt":"2025-06-16T12:10:49","slug":"determine-the-number-of-protons-neutrons-and-electrons-in-each-isotope-using-the-atomic-number-z-and-mass-number-a","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/16\/determine-the-number-of-protons-neutrons-and-electrons-in-each-isotope-using-the-atomic-number-z-and-mass-number-a\/","title":{"rendered":"Determine the number of protons, neutrons, and electrons in each isotope using the atomic number (Z) and mass number (A)."},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/06\/image-581.png\" alt=\"\" class=\"wp-image-236671\"\/><\/figure>\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>To generate the correct answers, determine the number of <strong>protons<\/strong>, <strong>neutrons<\/strong>, and <strong>electrons<\/strong> in each isotope using the atomic number (Z) and mass number (A).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Protons<\/strong> = Atomic number (Z)<\/li>\n\n\n\n<li><strong>Neutrons<\/strong> = Mass number (A) minus Atomic number (A \u2212 Z)<\/li>\n\n\n\n<li><strong>Electrons<\/strong> = Same as protons in a neutral atom<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>a)<\/strong><br>Isotope: 2040Ca^{40}_{20}\\text{Ca}2040\u200bCa<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Protons: 20<\/li>\n\n\n\n<li>Neutrons: 40 \u2212 20 = 20<\/li>\n\n\n\n<li>Electrons: 20<\/li>\n<\/ul>\n\n\n\n<p><strong>b)<\/strong><br>Isotope: 1840Ar^{40}_{18}\\text{Ar}1840\u200bAr<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Protons: 18<\/li>\n\n\n\n<li>Neutrons: 40 \u2212 18 = 22<\/li>\n\n\n\n<li>Electrons: 18<\/li>\n<\/ul>\n\n\n\n<p><strong>c)<\/strong><br>Isotope: 52127Te^{127}_{52}\\text{Te}52127\u200bTe<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Protons: 52<\/li>\n\n\n\n<li>Neutrons: 127 \u2212 52 = 75<\/li>\n\n\n\n<li>Electrons: 52<\/li>\n<\/ul>\n\n\n\n<p><strong>d)<\/strong><br>Isotope: 84209Po^{209}_{84}\\text{Po}84209\u200bPo<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Protons: 84<\/li>\n\n\n\n<li>Neutrons: 209 \u2212 84 = 125<\/li>\n\n\n\n<li>Electrons: 84<\/li>\n<\/ul>\n\n\n\n<p><strong>e)<\/strong><br>Isotope: 63152Eu^{152}_{63}\\text{Eu}63152\u200bEu<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Protons: 63<\/li>\n\n\n\n<li>Neutrons: 152 \u2212 63 = 89<\/li>\n\n\n\n<li>Electrons: 63<\/li>\n<\/ul>\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>Atoms are composed of protons, neutrons, and electrons. The <strong>atomic number<\/strong> is the number of protons, which identifies the element. The <strong>mass number<\/strong> is the sum of protons and neutrons in the nucleus. Electrons in a neutral atom are equal to the number of protons because their negative charge balances the positive charge of the protons.<\/p>\n\n\n\n<p>The difference between isotopes of the same element is in the number of neutrons. For example, calcium-40 and calcium-42 both have 20 protons but different numbers of neutrons. This difference affects the atomic mass but not the chemical properties significantly.<\/p>\n\n\n\n<p>Understanding these subatomic particles is fundamental in atomic theory, nuclear chemistry, and radiation studies. Neutrons play a key role in isotope stability. A change in proton number results in a new element, while a change in neutron count results in a different isotope of the same element.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-703.jpeg\" alt=\"\" class=\"wp-image-236672\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>The Correct Answer and Explanation is: To generate the correct answers, determine the number of protons, neutrons, and electrons in each isotope using the atomic number (Z) and mass number (A). a)Isotope: 2040Ca^{40}_{20}\\text{Ca}2040\u200bCa b)Isotope: 1840Ar^{40}_{18}\\text{Ar}1840\u200bAr c)Isotope: 52127Te^{127}_{52}\\text{Te}52127\u200bTe d)Isotope: 84209Po^{209}_{84}\\text{Po}84209\u200bPo e)Isotope: 63152Eu^{152}_{63}\\text{Eu}63152\u200bEu Explanation Atoms are composed of protons, neutrons, and electrons. The atomic number is the [&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-236670","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/236670","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=236670"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/236670\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=236670"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=236670"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=236670"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}