{"id":234395,"date":"2025-06-14T05:28:26","date_gmt":"2025-06-14T05:28:26","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=234395"},"modified":"2025-06-14T05:28:28","modified_gmt":"2025-06-14T05:28:28","slug":"copper-atomic-number-29-has-two-isotopes-cu-63-atomic-mass-63-and-cu-65-atomic-mass-65","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/14\/copper-atomic-number-29-has-two-isotopes-cu-63-atomic-mass-63-and-cu-65-atomic-mass-65\/","title":{"rendered":"Copper (atomic number = 29) has two isotopes: Cu-63 (atomic mass = 63) and Cu-65 (atomic mass = 65)."},"content":{"rendered":"\n<p>Copper (atomic number = 29) has two isotopes: Cu-63 (atomic mass = 63) and Cu-65 (atomic mass = 65). How many of each subatomic particle are in Cu-65?<\/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><strong>Correct Answer:<\/strong><\/p>\n\n\n\n<p>For <strong>Cu-65<\/strong> (Copper-65):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Protons:<\/strong> 29<\/li>\n\n\n\n<li><strong>Neutrons:<\/strong> 36<\/li>\n\n\n\n<li><strong>Electrons (in a neutral atom):<\/strong> 29<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<p>Cu-65, or Copper-65, is one of the naturally occurring isotopes of the element copper. The notation &#8220;Cu-65&#8221; indicates an isotope of copper with a <strong>mass number<\/strong> of 65. The <strong>mass number<\/strong> of an atom is the total number of protons and neutrons in its nucleus.<\/p>\n\n\n\n<p>Copper&#8217;s <strong>atomic number is 29<\/strong>, which means <strong>every atom of copper has 29 protons<\/strong> in its nucleus. The atomic number is what defines the element\u2014any atom with 29 protons is a copper atom, regardless of how many neutrons it has.<\/p>\n\n\n\n<p>To find the number of <strong>neutrons<\/strong> in Cu-65, subtract the atomic number from the mass number:Neutrons=Mass&nbsp;number\u2212Atomic&nbsp;number=65\u221229=36\\text{Neutrons} = \\text{Mass number} &#8211; \\text{Atomic number} = 65 &#8211; 29 = 36Neutrons=Mass&nbsp;number\u2212Atomic&nbsp;number=65\u221229=36<\/p>\n\n\n\n<p>So, Cu-65 has <strong>36 neutrons<\/strong>.<\/p>\n\n\n\n<p>In a <strong>neutral atom<\/strong>, the number of <strong>electrons is equal to the number of protons<\/strong> because the positive charges from the protons are balanced by the negative charges from the electrons. Since Cu-65 is neutral (unless otherwise stated), it has:Electrons=Protons=29\\text{Electrons} = \\text{Protons} = 29Electrons=Protons=29<\/p>\n\n\n\n<p>Therefore, in a single atom of Cu-65:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>nucleus<\/strong> contains <strong>29 protons<\/strong> and <strong>36 neutrons<\/strong>, giving it a total mass of 65 atomic mass units (u).<\/li>\n\n\n\n<li>There are <strong>29 electrons<\/strong> orbiting the nucleus in various energy levels or shells.<\/li>\n<\/ul>\n\n\n\n<p>This isotopic structure allows Cu-65 to behave chemically like all other copper atoms, because chemical behavior is governed by electrons and especially the electrons in the outermost shell, which are the same for all copper isotopes.<\/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-banner8-398.jpeg\" alt=\"\" class=\"wp-image-234396\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Copper (atomic number = 29) has two isotopes: Cu-63 (atomic mass = 63) and Cu-65 (atomic mass = 65). How many of each subatomic particle are in Cu-65? The Correct Answer and Explanation is: Correct Answer: For Cu-65 (Copper-65): Explanation: Cu-65, or Copper-65, is one of the naturally occurring isotopes of the element copper. 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-234395","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/234395","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=234395"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/234395\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=234395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=234395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=234395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}