{"id":5226,"date":"2026-06-18T07:46:55","date_gmt":"2026-06-18T06:46:55","guid":{"rendered":"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-1-periodicity\/"},"modified":"2026-09-11T17:20:15","modified_gmt":"2026-09-11T16:20:15","slug":"3-2-1-periodicity","status":"publish","type":"page","link":"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-1-periodicity\/","title":{"rendered":"3.2.1 Periodicity"},"content":{"rendered":"\n<div class=\"ols-aqa321-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>3.2.1 Periodicity<\/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\/3-2-1-periodicity\/trends-in-a-period\/\">Trends in a Period<\/a>\r\n      <\/li>\r\n\r\n      <li>\r\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-1-periodicity\/trends-in-a-group\/\">Trends in a Group<\/a>\r\n      <\/li>\r\n\r\n      <li>\r\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-1-periodicity\/periodic-trends\/\">Periodic Trends<\/a>\r\n      <\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div class=\"ols-topic-group\">\r\n    <h4>Next Topics<\/h4>\r\n\r\n    <ul class=\"ols-topic-list\">\r\n      <li><a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-1-atomicstructure\/\">3.1.1 Atomic Structure<\/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 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  <div class=\"ols-aqa321-container\">\n      <nav class=\"ols-aqa321-breadcrumb\" aria-label=\"Breadcrumb\">\n        <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        <span>3.2.1 Periodicity<\/span>\n      <\/nav>\n    <\/div>\n  <\/div>\n\n  <!-- INTRO -->\n  <section class=\"ols-aqa321-intro\">\n    <div class=\"ols-aqa321-container\">\n      <div class=\"ols-aqa321-intro-inner\">\n\n        <div>\n          <div class=\"ols-aqa321-eyebrow\">AQA A Level Chemistry<\/div>\n          <h1>3.2.1<br>Periodicity<\/h1>\n          <div class=\"ols-aqa321-accent-bar\"><\/div>\n          <p class=\"ols-aqa321-intro-lead\">\n            AQA 3.2.1 introduces periodicity through the classification of elements and the physical properties of Period 3 elements. These pages cover s, p, d and f block classification, trends in atomic radius, first ionisation energy and melting point, and how these trends are explained using structure and bonding.\n          <\/p>\n        <\/div>\n\n        <div class=\"ols-aqa321-info-grid\">\n          <div class=\"ols-aqa321-info-card\">\n            <div class=\"ols-aqa321-info-card-label\">Exam Paper<\/div>\n            <div class=\"ols-aqa321-info-card-value\">Paper 1<\/div>\n            <div class=\"ols-aqa321-info-card-sub\">7405\/1<\/div>\n          <\/div>\n          <div class=\"ols-aqa321-info-card\">\n            <div class=\"ols-aqa321-info-card-label\">Specification Points<\/div>\n            <div class=\"ols-aqa321-info-card-value\">3.2.1.1 &#8211; 3.2.1.2<\/div>\n            <div class=\"ols-aqa321-info-card-sub\">2 AQA sections<\/div>\n          <\/div>\n          <div class=\"ols-aqa321-info-card\">\n            <div class=\"ols-aqa321-info-card-label\">Topic Parts<\/div>\n            <div class=\"ols-aqa321-info-card-value\">3 parts<\/div>\n            <div class=\"ols-aqa321-info-card-sub\">Revision notes available<\/div>\n          <\/div>\n          <div class=\"ols-aqa321-info-card\">\n            <div class=\"ols-aqa321-info-card-label\">Exam Board<\/div>\n            <div class=\"ols-aqa321-info-card-value\">AQA<\/div>\n            <div class=\"ols-aqa321-info-card-sub\">AQA 7405<\/div>\n          <\/div>\n        <\/div>\n\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- TOPIC CARDS -->\n  <section class=\"ols-aqa321-topics\">\n    <div class=\"ols-aqa321-container\">\n\n      <div class=\"ols-aqa321-section-header\">\n        <h2 class=\"ols-aqa321-section-title\">Revision Notes<\/h2>\n        <p class=\"ols-aqa321-section-sub\">Work through each part of AQA 3.2.1 in a structured sequence.<\/p>\n      <\/div>\n\n      <div class=\"ols-aqa321-cards-grid\">\n\n        <!-- Card 1: Trends in a Period -->\n        <a class=\"ols-aqa321-card ols-aqa321-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-1-periodicity\/trends-in-a-period\/\">\n          <div class=\"ols-aqa321-card-img-wrap\">\n            <div class=\"ols-aqa321-visual ols-aqa321-visual--period\">\n              <div class=\"ols-aqa321-visual-panel\">\n                <div class=\"ols-aqa321-visual-kicker\">Period 3<\/div>\n                <div class=\"ols-aqa321-visual-main\">Trends in<br>a Period<\/div>\n                <div class=\"ols-aqa321-arrow-line\" aria-hidden=\"true\"><span>Na<\/span>\u2192<span>Ar<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa321-card-num\">1<\/div>\n            <span class=\"ols-aqa321-card-status ols-aqa321-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa321-card-body\">\n            <p class=\"ols-aqa321-card-title\">Trends in a Period<\/p>\n            <p class=\"ols-aqa321-card-desc\">Trends in atomic radius, first ionisation energy and melting point across Period 3 from sodium to argon.<\/p>\n            <span class=\"ols-aqa321-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: Trends in a Group -->\n        <a class=\"ols-aqa321-card ols-aqa321-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-1-periodicity\/trends-in-a-group\/\">\n          <div class=\"ols-aqa321-card-img-wrap\">\n            <div class=\"ols-aqa321-visual ols-aqa321-visual--group\">\n              <div class=\"ols-aqa321-visual-panel\">\n                <div class=\"ols-aqa321-visual-kicker\">Down a group<\/div>\n                <div class=\"ols-aqa321-visual-main\">Trends in<br>a Group<\/div>\n                <div class=\"ols-aqa321-config-line\" aria-hidden=\"true\"><span>\u2193 radius<\/span><span>\u2193 IE<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa321-card-num\">2<\/div>\n            <span class=\"ols-aqa321-card-status ols-aqa321-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa321-card-body\">\n            <p class=\"ols-aqa321-card-title\">Trends in a Group<\/p>\n            <p class=\"ols-aqa321-card-desc\">Key group trends, including atomic radius and first ionisation energy, linked to shells and shielding.<\/p>\n            <span class=\"ols-aqa321-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 3: Periodic Trends -->\n        <a class=\"ols-aqa321-card ols-aqa321-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-1-periodicity\/periodic-trends\/\">\n          <div class=\"ols-aqa321-card-img-wrap\">\n            <div class=\"ols-aqa321-visual ols-aqa321-visual--trends\">\n              <div class=\"ols-aqa321-visual-panel\">\n                <div class=\"ols-aqa321-visual-kicker\">Overall patterns<\/div>\n                <div class=\"ols-aqa321-visual-main\">Periodic<br>Trends<\/div>\n                <div class=\"ols-aqa321-config-line\" aria-hidden=\"true\"><span>r<\/span><span>IE<\/span><span>mp<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa321-card-num\">3<\/div>\n            <span class=\"ols-aqa321-card-status ols-aqa321-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa321-card-body\">\n            <p class=\"ols-aqa321-card-title\">Periodic Trends<\/p>\n            <p class=\"ols-aqa321-card-desc\">Classification of elements and the wider patterns in atomic radius, ionisation energy and melting point.<\/p>\n            <span class=\"ols-aqa321-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>\n    <\/div>\n  <\/section>\n\n  <!-- SPECIFICATION -->\n  <section class=\"ols-aqa321-spec-section\">\n    <div class=\"ols-aqa321-container\">\n\n      <!-- DESKTOP SPECIFICATION -->\n      <div class=\"ols-aqa321-spec-desktop\">\n        <div class=\"ols-aqa321-spec-wrap\">\n          <div class=\"ols-aqa321-spec-pill\">Specification Coverage<\/div>\n          <h2 class=\"ols-aqa321-spec-heading\">3.2.1 Periodicity &#8211; AQA A Level Chemistry<\/h2>\n          <p class=\"ols-aqa321-spec-intro-text\">The following AQA specification points outline the knowledge and skills students are expected to demonstrate for Periodicity.<\/p>\n\n          <h3 class=\"ols-aqa321-spec-group-title\">3.2.1 Periodicity<\/h3>\n          <div class=\"ols-aqa321-spec-rows\">\n\n            <div class=\"ols-aqa321-spec-row ols-aqa321-spec-row--light\">\n              <div class=\"ols-aqa321-spec-code ols-aqa321-spec-code--dark\">3.2.1.1<\/div>\n              <div class=\"ols-aqa321-spec-text\">\n                <strong>Classification<\/strong><br>\n                An element is classified as s, p, d or f block according to its position in the Periodic Table, which is determined by its proton number.\n              <\/div>\n            <\/div>\n\n            <div class=\"ols-aqa321-spec-row ols-aqa321-spec-row--mid\">\n              <div class=\"ols-aqa321-spec-code ols-aqa321-spec-code--mid\">3.2.1.2<\/div>\n              <div class=\"ols-aqa321-spec-text\">\n                <strong>Physical properties of Period 3 elements<\/strong><br>\n                The trends in atomic radius, first ionisation energy and melting point of the elements Na-Ar.<br>\n                The reasons for these trends in terms of the structure of and bonding in the elements.\n                <div class=\"ols-aqa321-spec-sub-list\">\n                  <div class=\"ols-aqa321-spec-sub-row\">\n                    <div class=\"ols-aqa321-spec-sub-code\">1<\/div>\n                    <div class=\"ols-aqa321-spec-sub-text\">explain the trends in atomic radius and first ionisation energy<\/div>\n                  <\/div>\n                  <div class=\"ols-aqa321-spec-sub-row\">\n                    <div class=\"ols-aqa321-spec-sub-code\">2<\/div>\n                    <div class=\"ols-aqa321-spec-sub-text\">explain the melting point of the elements in terms of their structure and bonding.<\/div>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n\n          <\/div>\n        <\/div>\n      <\/div>\n\n      <!-- MOBILE SPECIFICATION -->\n      <div class=\"ols-aqa321-spec-mobile\">\n        <div class=\"ols-aqa321-spec-wrap\">\n          <div class=\"ols-aqa321-spec-pill\">Specification Coverage<\/div>\n          <h2 class=\"ols-aqa321-spec-heading\">3.2.1 Periodicity &#8211; AQA A Level Chemistry<\/h2>\n          <p class=\"ols-aqa321-spec-intro-text\">The following AQA specification points outline the knowledge and skills students are expected to demonstrate for Periodicity.<\/p>\n\n          <h3 class=\"ols-aqa321-spec-group-title\">3.2.1 Periodicity<\/h3>\n          <div class=\"ols-aqa321-spec-mob-rows\">\n\n            <div class=\"ols-aqa321-spec-mob-row ols-aqa321-spec-mob-row--light\">\n              <div class=\"ols-aqa321-spec-mob-code\">3.2.1.1<\/div>\n              <div class=\"ols-aqa321-spec-mob-text\">\n                <strong>Classification<\/strong><br>\n                An element is classified as s, p, d or f block according to its position in the Periodic Table, which is determined by its proton number.\n              <\/div>\n            <\/div>\n\n            <div class=\"ols-aqa321-spec-mob-row ols-aqa321-spec-mob-row--mid\">\n              <div class=\"ols-aqa321-spec-mob-code ols-aqa321-spec-mob-code--mid\">3.2.1.2<\/div>\n              <div class=\"ols-aqa321-spec-mob-text\">\n                <strong>Physical properties of Period 3 elements<\/strong><br>\n                The trends in atomic radius, first ionisation energy and melting point of the elements Na-Ar.<br>\n                The reasons for these trends in terms of the structure of and bonding in the elements.\n                <div class=\"ols-aqa321-spec-mob-sub-list\">\n                  <div class=\"ols-aqa321-spec-mob-sub-row\">\n                    <div class=\"ols-aqa321-spec-mob-sub-code\">1<\/div>\n                    <div class=\"ols-aqa321-spec-mob-sub-text\">explain the trends in atomic radius and first ionisation energy<\/div>\n                  <\/div>\n                  <div class=\"ols-aqa321-spec-mob-sub-row\">\n                    <div class=\"ols-aqa321-spec-mob-sub-code\">2<\/div>\n                    <div class=\"ols-aqa321-spec-mob-sub-text\">explain the melting point of the elements in terms of their structure and bonding.<\/div>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n\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      \"@type\": \"WebPage\",\n      \"@id\": \"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-1-periodicity\/#webpage\",\n      \"url\": 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These pages cover s, p, d and f block classification, trends in atomic radius, first ionisation energy and melting point, and how [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"parent":5210,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-5226","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/pages\/5226","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=5226"}],"version-history":[{"count":0,"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/pages\/5226\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/pages\/5210"}],"wp:attachment":[{"href":"https:\/\/www.onlinelearningsystem.net\/xyz\/wp-json\/wp\/v2\/media?parent=5226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}