{"id":977,"date":"2024-08-27T12:02:38","date_gmt":"2024-08-27T06:32:38","guid":{"rendered":"https:\/\/www.chemtopper.com\/myblog\/?page_id=977"},"modified":"2025-07-18T20:32:54","modified_gmt":"2025-07-18T15:02:54","slug":"periodic-trends-atomic-size-how-atomic-size-changes-with-location-in-periodic-table","status":"publish","type":"page","link":"https:\/\/www.chemtopper.com\/myblog\/periodic-trends-atomic-size-how-atomic-size-changes-with-location-in-periodic-table\/","title":{"rendered":"Periodic Trend Of Atomic Size"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><a href=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/SIZE-OF-ATOMS-2.png\"><img loading=\"lazy\" decoding=\"async\" width=\"819\" height=\"1024\" src=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/SIZE-OF-ATOMS-2-819x1024.png\" alt=\"Periodic Trend Of Atomic Size\" class=\"wp-image-1416\" srcset=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/SIZE-OF-ATOMS-2-819x1024.png 819w, https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/SIZE-OF-ATOMS-2-240x300.png 240w, https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/SIZE-OF-ATOMS-2-768x960.png 768w, https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/SIZE-OF-ATOMS-2.png 1080w\" sizes=\"auto, (max-width: 819px) 100vw, 819px\" \/><\/a><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-1ed17448a3b5e0867b3d214b215ea954\">What Determines Periodic Trend Of Atomic Size?<\/h2>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-eac3af3fa34c579f59dc591508fb4087\">The <strong>atomic size<\/strong> of an element isn\u2019t random\u2014it depends mainly on <strong>two key factors<\/strong>:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Effective Nuclear Charge (Zeff)<\/strong><\/li>\n\n\n\n<li><strong>Number of Electron Shells<\/strong><\/li>\n<\/ol>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-40679cdaa9134e252136c236900e01e4\">Let\u2019s break down how each one affects the size of an atom.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-58428a72341b61bf12e8e92e5eb25f45\">1. Effective Nuclear Charge (Zeff) Effect On Periodic Trend Of Atomic Size.<\/h2>\n\n\n\n<p><strong>Zeff<\/strong> refers to the net positive charge experienced by valence electrons. It depends on the number of protons in the nucleus and how well inner electrons shield that positive charge.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>When <strong>Zeff increases<\/strong>, the nucleus pulls the outermost electrons <strong>more strongly<\/strong>. This pulls the <strong>valence shell closer<\/strong> to the nucleus, which causes the atomic size to <strong>decrease<\/strong>.<\/li>\n\n\n\n<li>When <strong>Zeff is lower<\/strong>, the attractive force on the outer electrons is <strong>weaker<\/strong>. As a result, the valence shell tends to <strong>expand outward<\/strong> to reduce electron\u2013electron repulsion, which makes the atomic size <strong>large<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-86d96b9fa7925d570b0b9e773e24a8ce\">Number of Electron Shells On Periodic Trend Of Atomic Size.<\/h2>\n\n\n\n<p>The number of <strong>energy levels (shells)<\/strong> also directly affects atomic size.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>More shells<\/strong> mean a <strong>greater distance<\/strong> between the nucleus and the outermost electrons. This weakens the pull of the nucleus, causing the atomic size to <strong>increase<\/strong>.<\/li>\n\n\n\n<li><strong>Additionally<\/strong>, more inner shells mean <strong>more shielding<\/strong>, which further <strong>reduces the attraction<\/strong> between the nucleus and the valence electrons. This also leads to a <strong>larger atomic radius<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-c17fd73bfe0caa3a0f7093f4be933ddf\">Summary Of Periodic Trend Of Atomic Size<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Higher Zeff \u2192 Smaller atom<\/strong><\/li>\n\n\n\n<li><strong>More shells \u2192 Larger atom<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Understanding how atomic size changes with these two factors helps explain <strong>periodic trends<\/strong> across periods and down groups.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Atomic Size Decreases Across a Period<\/h2>\n\n\n\n<p>As you move <strong>from left to right across a period<\/strong> in the periodic table, the <strong>atomic size decreases<\/strong>. This trend can be explained by two key factors:<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-f96c6620e6e7474b289035c47749a3c6\">1. Increase in Effective Nuclear Charge (Zeff)<\/h3>\n\n\n\n<p>As we move across a period, each element gains <strong>one additional proton<\/strong> in the nucleus and <strong>one additional electron<\/strong> in the same energy shell.<\/p>\n\n\n\n<p>Because these added electrons enter the <strong>same shell<\/strong>, they <strong>do not increase shielding significantly<\/strong>. Meanwhile, the increasing number of protons in the nucleus <strong>raises the effective nuclear charge (Zeff)<\/strong>.<\/p>\n\n\n\n<p><strong>As a result<\/strong>, the nucleus pulls the electrons <strong>more strongly<\/strong>, drawing them closer and <strong>reducing the atomic radius<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-1037b76ab5f5003c5b347ff171f3220d\">2. Number of Shells Remains Constant<\/h3>\n\n\n\n<p>Throughout a period, the number of <strong>energy levels (shells)<\/strong> stays the same.<br>Since electrons are not added to new shells, the <strong>distance between the nucleus and outermost electrons doesn\u2019t increase<\/strong>.<\/p>\n\n\n\n<p><strong>Therefore<\/strong>, the only major factor influencing size is the <strong>increasing nuclear attraction<\/strong>, which causes the atom to <strong>shrink across the period<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-1.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"152\" src=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-1-1024x152.png\" alt=\"Across the period \u2013 Size decreases \" class=\"wp-image-1393\" srcset=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-1-1024x152.png 1024w, https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-1-300x45.png 300w, https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-1-768x114.png 768w, https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-1.png 1105w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-908602141086d91c74298a0851ab19bf\">Summary Periodic Trend Of Atomic Size Across The Period.<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Z_eff increases<\/strong> due to more protons<\/li>\n\n\n\n<li><strong>No new shells are added<\/strong><\/li>\n\n\n\n<li><strong>Overall result<\/strong>: Atomic radius decreases across a period<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-9f39689b4f0c60bb13bffbc1379f0794\">Why Atomic Size Increases Down a Group<\/h2>\n\n\n\n<p>As you move <strong>down a group<\/strong> in the periodic table, the <strong>atomic size increases<\/strong>. This trend can be explained by looking at two key factors:<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-99537b920f2803a4d8ad79ed4c8486c8\">1.Decrease in Effective Nuclear Charge (Zeff)<\/h3>\n\n\n\n<p>As we go down a group, each successive element has <strong>more inner electron shells<\/strong>. These inner electrons create a <strong>stronger shielding effect<\/strong>, which <strong>reduces the effective nuclear charge<\/strong> felt by the outermost (valence) electrons.<\/p>\n\n\n\n<p><strong>As a result<\/strong>, the attraction between the nucleus and the outer electrons becomes weaker, and the <strong>valence shell is held less tightly<\/strong>, leading to a <strong>larger atomic radius<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-fa1416c39dc87a5f79b899fb314572f8\">2. Increase in the Number of Shells<\/h3>\n\n\n\n<p>Each new period adds an additional <strong>electron shell<\/strong> to the atom.<br>This <strong>increases the distance<\/strong> between the nucleus and the outermost electrons.<br>At the same time, more shells mean <strong>more shielding electrons<\/strong>, which further reduce the pull of the nucleus on the outer shell.<\/p>\n\n\n\n<p><strong>Together<\/strong>, these effects cause the atomic size to <strong>increase steadily down the group<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-2.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"168\" src=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-2-1024x168.png\" alt=\"Down the group-Size increases \" class=\"wp-image-1394\" srcset=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-2-1024x168.png 1024w, https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-2-300x49.png 300w, https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-2-768x126.png 768w, https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/image-2.png 1105w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-black-color has-text-color has-link-color wp-elements-b3c8d4d38c7a1bab1f5cbbfe61bceb42\">Summary Of Periodic Trend Of Atomic Size Down The Group.<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Zeff decreases<\/strong> due to increased shielding<\/li>\n\n\n\n<li><strong>Number of shells increases<\/strong>, adding to atomic size<\/li>\n\n\n\n<li><strong>Overall result<\/strong>: Atomic radius increases down a group<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/Periodic-trend-of-atomic-size.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"670\" height=\"677\" src=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/Periodic-trend-of-atomic-size.jpg\" alt=\"Periodic Trend Of Atomic Size\" class=\"wp-image-1413\" style=\"width:547px;height:auto\" srcset=\"https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/Periodic-trend-of-atomic-size.jpg 670w, https:\/\/www.chemtopper.com\/myblog\/wp-content\/uploads\/2025\/05\/Periodic-trend-of-atomic-size-297x300.jpg 297w\" sizes=\"auto, (max-width: 670px) 100vw, 670px\" \/><\/a><figcaption class=\"wp-element-caption\">Periodic Trend Of Atomic Size<\/figcaption><\/figure>\n\n\n\n<div class=\"h5p-iframe-wrapper\"><iframe id=\"h5p-iframe-6\" class=\"h5p-iframe\" data-content-id=\"6\" style=\"height:1px\" src=\"about:blank\" frameBorder=\"0\" scrolling=\"no\" title=\"Practice questions for better understanding of Periodic Trend Of Atomic Size in chemistry.\"><\/iframe><\/div>\n","protected":false},"excerpt":{"rendered":"<p>What Determines Periodic Trend Of Atomic Size? The atomic size of an element isn\u2019t random\u2014it depends mainly on two key factors: Let\u2019s break down how each one affects the size of an atom. 1. Effective Nuclear Charge (Zeff) Effect On Periodic Trend Of Atomic Size. Zeff refers to the net positive charge experienced by valence &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.chemtopper.com\/myblog\/periodic-trends-atomic-size-how-atomic-size-changes-with-location-in-periodic-table\/\"> <span class=\"screen-reader-text\">Periodic Trend Of Atomic Size<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[13,44],"class_list":["post-977","page","type-page","status-publish","hentry","category-ap-chemistry-exam","category-periodic-trends-of-elements"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Periodic Trend Of Atomic Size in the periodic table of elements<\/title>\n<meta name=\"description\" content=\"Learn and practice Periodic Trend Of Atomic Size in the periodic table of elements. 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