{"id":5218,"date":"2026-06-18T07:46:33","date_gmt":"2026-06-18T06:46:33","guid":{"rendered":"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/ionisationenergy\/"},"modified":"2026-09-11T17:20:11","modified_gmt":"2026-09-11T16:20:11","slug":"ionisation-energy","status":"publish","type":"page","link":"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/ionisation-energy\/","title":{"rendered":"Ionisation Energy"},"content":{"rendered":"\n<div class=\"ols-aqa311ie-page\">\n\n  <aside class=\"ols-sidebar\">\r\n  <div class=\"ols-sidebar-header\">\r\n    <h3>Revision Notes<\/h3>\r\n    <p>AQA A Level Chemistry<\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ols-topic-group\">\r\n    <h4>3.1.1 Atomic Structure<\/h4>\r\n\r\n    <ul class=\"ols-topic-list\">\r\n      <li>\r\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/atomic-structure\/\">Atomic Structure<\/a>\r\n      <\/li>\r\n\r\n      <li>\r\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/mass-spectrometry\/\">Mass Spectrometry<\/a>\r\n\r\n        <ul class=\"ols-subtopic-list\">\r\n          <li>\r\n            <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/mass-spectrometry\/the-mass-spectrometer\/\">The Mass Spectrometer<\/a>\r\n          <\/li>\r\n          <li>\r\n            <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/mass-spectrometry\/time-of-flight\/\">Time of Flight<\/a>\r\n          <\/li>\r\n          <li>\r\n            <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/mass-spectrometry\/ram-calculations\/\">RAM Calculations<\/a>\r\n          <\/li>\r\n          <li>\r\n            <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/mass-spectrometry\/predicting-diatomic-mass-spectra\/\">Predicting Diatomic Mass Spectra<\/a>\r\n          <\/li>\r\n          <li>\r\n            <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/mass-spectrometry\/identifying-compounds-from-mass-spectra\/\">Identifying Compounds from Mass Spectra<\/a>\r\n          <\/li>\r\n        <\/ul>\r\n      <\/li>\r\n\r\n      <li>\r\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/electron-configuration\/\">Electron Configuration<\/a>\r\n      <\/li>\r\n\r\n 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href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-1-periodicity\/\">3.2.1 Periodicity<\/a><\/li>\n<li>\r\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-2-amount-of-substance\/\">3.1.2 Amount of Substance<\/a>\r\n      <\/li>\r\n      <li>\r\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-3-bonding\/\">3.1.3 Bonding<\/a>\r\n      <\/li>\r\n      <li>\r\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-4-energetics\/\">3.1.4 Energetics<\/a>\r\n      <\/li>\r\n    <\/ul>\r\n  <\/div>\r\n<\/aside>\r\n\r\n<script>\r\n(function() {\r\n  function normalisePath(path) {\r\n    return String(path || '')\r\n      .split('?')[0]\r\n      .split('#')[0]\r\n      .replace(\/\\\/+$\/, '')\r\n      .toLowerCase();\r\n  }\r\n\r\n  function highlightActive() {\r\n    var sidebar = 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  <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/\">Revision Notes<\/a> \/\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/\">A Level Chemistry<\/a> \/\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/\">AQA<\/a> \/\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/\">3.1.1 Atomic Structure<\/a> \/\n        <span>Ionisation Energy<\/span>\n      <\/nav>\n    <\/div>\n  <\/div>\n\n  <!-- INTRO -->\n  <section class=\"ols-aqa311ie-intro\"><div class=\"ols-aqa311ie-container\"><div class=\"ols-aqa311ie-intro-inner\">\n    <div><div class=\"ols-aqa311ie-eyebrow\">AQA A Level Chemistry<\/div><h1>Ionisation<br>Energy<\/h1><div class=\"ols-aqa311ie-accent-bar\"><\/div><p class=\"ols-aqa311ie-intro-lead\">Ionisation energy in AQA 3.1.1 links atomic structure to electron configuration. These pages cover the definition of first ionisation energy, equations for first and successive ionisation energies, and how ionisation energy evidence supports the arrangement of electrons in shells and sub-shells.<\/p><\/div>\n    <div class=\"ols-aqa311ie-info-grid\"><div class=\"ols-aqa311ie-info-card\"><div class=\"ols-aqa311ie-info-card-label\">Exam Paper<\/div><div class=\"ols-aqa311ie-info-card-value\">Paper 1<\/div><div class=\"ols-aqa311ie-info-card-sub\">7405\/1<\/div><\/div><div class=\"ols-aqa311ie-info-card\"><div class=\"ols-aqa311ie-info-card-label\">Specification Point<\/div><div class=\"ols-aqa311ie-info-card-value\">3.1.1.3<\/div><div class=\"ols-aqa311ie-info-card-sub\">Electron configuration<\/div><\/div><div class=\"ols-aqa311ie-info-card\"><div class=\"ols-aqa311ie-info-card-label\">Topic Parts<\/div><div class=\"ols-aqa311ie-info-card-value\">2 parts<\/div><div class=\"ols-aqa311ie-info-card-sub\">Revision notes available<\/div><\/div><div class=\"ols-aqa311ie-info-card\"><div class=\"ols-aqa311ie-info-card-label\">Exam Board<\/div><div class=\"ols-aqa311ie-info-card-value\">AQA<\/div><div class=\"ols-aqa311ie-info-card-sub\">AQA 7405<\/div><\/div><\/div>\n  <\/div><\/div><\/section>\n\n  <!-- TOPIC CARDS -->\n  <section class=\"ols-aqa311ie-topics\"><div class=\"ols-aqa311ie-container\"><div class=\"ols-aqa311ie-section-header\"><h2 class=\"ols-aqa311ie-section-title\">Revision Notes<\/h2><p class=\"ols-aqa311ie-section-sub\">Work through Ionisation Energy in a structured AQA sequence.<\/p><\/div><div class=\"ols-aqa311ie-cards-grid\">\n\n        <!-- Card 1: Introduction to Ionisation Energy -->\n        <a class=\"ols-aqa311ie-card ols-aqa311ie-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/ionisation-energy\/introduction-to-ionisation-energy\/\">\n          <div class=\"ols-aqa311ie-card-img-wrap\">\n            <div class=\"ols-aqa311ie-visual ols-aqa311ie-visual--ionisation\">\n              <div class=\"ols-aqa311ie-visual-panel\">\n                <div class=\"ols-aqa311ie-visual-kicker\">First electron removed<\/div>\n                <div class=\"ols-aqa311ie-visual-main\">Intro to<br>Ionisation<\/div>\n                <div class=\"ols-aqa311ie-symbol-row\" aria-hidden=\"true\"><span class=\"ols-aqa311ie-dot\">M<\/span><span class=\"ols-aqa311ie-line\"><\/span><span class=\"ols-aqa311ie-dot\">M<sup>+<\/sup><\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa311ie-card-num\">1<\/div>\n            <span class=\"ols-aqa311ie-card-status ols-aqa311ie-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa311ie-card-body\">\n            <p class=\"ols-aqa311ie-card-title\">Introduction to Ionisation Energy<\/p>\n            <p class=\"ols-aqa311ie-card-desc\">Definition of first ionisation energy, gas-state equations, nuclear attraction, shielding, atomic radius and key trend explanations.<\/p>\n            <span class=\"ols-aqa311ie-card-cta\">\n              Start revising\n              <svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg>\n            <\/span>\n          <\/div>\n        <\/a>\n\n        <!-- Card 2: Successive Ionisation Energies -->\n        <a class=\"ols-aqa311ie-card ols-aqa311ie-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/ionisation-energy\/successive-ionisation-energies\/\">\n          <div class=\"ols-aqa311ie-card-img-wrap\">\n            <div class=\"ols-aqa311ie-visual ols-aqa311ie-visual--identify\">\n              <div class=\"ols-aqa311ie-visual-panel\">\n                <div class=\"ols-aqa311ie-visual-kicker\">Evidence for shells<\/div>\n                <div class=\"ols-aqa311ie-visual-main\">Successive<br>Ionisation<\/div>\n                <div class=\"ols-aqa311ie-bars\" aria-hidden=\"true\"><span><\/span><span><\/span><span><\/span><span><\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa311ie-card-num\">2<\/div>\n            <span class=\"ols-aqa311ie-card-status ols-aqa311ie-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa311ie-card-body\">\n            <p class=\"ols-aqa311ie-card-title\">Successive Ionisation Energies<\/p>\n            <p class=\"ols-aqa311ie-card-desc\">Successive ionisation equations, large jumps, electron shell evidence and using Period 3 and Group 2 data to support electron configurations.<\/p>\n            <span class=\"ols-aqa311ie-card-cta\">\n              Start revising\n              <svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg>\n            <\/span>\n          <\/div>\n        <\/a>\n\n      <\/div><\/div><\/section>\n\n  <!-- SPECIFICATION -->\n  <section class=\"ols-aqa311ie-spec-section\">\n    <div class=\"ols-aqa311ie-container\">\n\n      <!-- DESKTOP SPECIFICATION -->\n      <div class=\"ols-aqa311ie-spec-desktop\">\n        <div class=\"ols-aqa311ie-spec-wrap\">\n          <div class=\"ols-aqa311ie-spec-pill\">Specification Coverage<\/div>\n          <h2 class=\"ols-aqa311ie-spec-heading\">3.1.1.3 Electron configuration &#8211; AQA A Level Chemistry<\/h2>\n          <p class=\"ols-aqa311ie-spec-intro-text\">The following AQA specification points are the ionisation-energy content within 3.1.1.3 Electron configuration.<\/p>\n\n          <h3 class=\"ols-aqa311ie-spec-group-title\">3.1.1.3 Electron configuration<\/h3>\n          <div class=\"ols-aqa311ie-spec-rows\">\n            <div class=\"ols-aqa311ie-spec-row ols-aqa311ie-spec-row--light\"><div class=\"ols-aqa311ie-spec-code ols-aqa311ie-spec-code--dark\">3.1.1.3<\/div><div class=\"ols-aqa311ie-spec-text\">Electron configurations of atoms and ions up to Z = 36 in terms of shells and sub-shells (orbitals) s, p and d.<\/div><\/div>\n            <div class=\"ols-aqa311ie-spec-row ols-aqa311ie-spec-row--light\"><div class=\"ols-aqa311ie-spec-code ols-aqa311ie-spec-code--dark\">3.1.1.3<\/div><div class=\"ols-aqa311ie-spec-text\">Ionisation energies.<\/div><\/div>\n            <div class=\"ols-aqa311ie-spec-row ols-aqa311ie-spec-row--mid\"><div class=\"ols-aqa311ie-spec-code ols-aqa311ie-spec-code--mid\">Skills<\/div><div class=\"ols-aqa311ie-spec-text\">Students should be able to:<div class=\"ols-aqa311ie-spec-sub-list\"><div class=\"ols-aqa311ie-spec-sub-row\"><div class=\"ols-aqa311ie-spec-sub-code\">1<\/div><div class=\"ols-aqa311ie-spec-sub-text\">define first ionisation energy<\/div><\/div><div class=\"ols-aqa311ie-spec-sub-row\"><div class=\"ols-aqa311ie-spec-sub-code\">2<\/div><div class=\"ols-aqa311ie-spec-sub-text\">write equations for first and successive ionisation energies<\/div><\/div><div class=\"ols-aqa311ie-spec-sub-row\"><div class=\"ols-aqa311ie-spec-sub-code\">3<\/div><div class=\"ols-aqa311ie-spec-sub-text\">explain how first and successive ionisation energies in Period 3 (Na-Ar) and in Group 2 (Be-Ba) give evidence for electron configuration in sub-shells and in shells.<\/div><\/div><\/div><\/div><\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n\n      <!-- MOBILE SPECIFICATION -->\n      <div class=\"ols-aqa311ie-spec-mobile\">\n        <div class=\"ols-aqa311ie-spec-wrap\">\n          <div class=\"ols-aqa311ie-spec-pill\">Specification Coverage<\/div>\n          <h2 class=\"ols-aqa311ie-spec-heading\">3.1.1.3 Electron configuration &#8211; AQA A Level Chemistry<\/h2>\n          <p class=\"ols-aqa311ie-spec-intro-text\">The following AQA specification points are the ionisation-energy content within 3.1.1.3 Electron configuration.<\/p>\n\n          <h3 class=\"ols-aqa311ie-spec-group-title\">3.1.1.3 Electron configuration<\/h3>\n          <div class=\"ols-aqa311ie-spec-mob-rows\">\n            <div class=\"ols-aqa311ie-spec-mob-row ols-aqa311ie-spec-mob-row--light\"><div class=\"ols-aqa311ie-spec-mob-code\">3.1.1.3<\/div><div class=\"ols-aqa311ie-spec-mob-text\">Electron configurations of atoms and ions up to Z = 36 in terms of shells and sub-shells (orbitals) s, p and d.<\/div><\/div>\n            <div class=\"ols-aqa311ie-spec-mob-row ols-aqa311ie-spec-mob-row--light\"><div class=\"ols-aqa311ie-spec-mob-code\">3.1.1.3<\/div><div class=\"ols-aqa311ie-spec-mob-text\">Ionisation energies.<\/div><\/div>\n            <div class=\"ols-aqa311ie-spec-mob-row ols-aqa311ie-spec-mob-row--mid\"><div class=\"ols-aqa311ie-spec-mob-code ols-aqa311ie-spec-mob-code--mid\">Skills<\/div><div class=\"ols-aqa311ie-spec-mob-text\">Students should be able to:<div class=\"ols-aqa311ie-spec-mob-sub-list\"><div class=\"ols-aqa311ie-spec-mob-sub-row\"><div class=\"ols-aqa311ie-spec-mob-sub-code\">1<\/div><div class=\"ols-aqa311ie-spec-mob-sub-text\">define first ionisation energy<\/div><\/div><div class=\"ols-aqa311ie-spec-mob-sub-row\"><div class=\"ols-aqa311ie-spec-mob-sub-code\">2<\/div><div class=\"ols-aqa311ie-spec-mob-sub-text\">write equations for first and successive ionisation energies<\/div><\/div><div class=\"ols-aqa311ie-spec-mob-sub-row\"><div class=\"ols-aqa311ie-spec-mob-sub-code\">3<\/div><div class=\"ols-aqa311ie-spec-mob-sub-text\">explain how first and successive ionisation energies in Period 3 (Na-Ar) and in Group 2 (Be-Ba) give evidence for electron configuration in sub-shells and in shells.<\/div><\/div><\/div><\/div><\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n\n    <\/div>\n  <\/section>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      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These pages cover the definition of first ionisation energy, equations for first and successive ionisation energies, and how ionisation energy evidence supports the arrangement [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"parent":5214,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-5218","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/pages\/5218","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/comments?post=5218"}],"version-history":[{"count":0,"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/pages\/5218\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/pages\/5214"}],"wp:attachment":[{"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/media?parent=5218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}