{"id":254404,"date":"2025-07-12T13:18:45","date_gmt":"2025-07-12T13:18:45","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=254404"},"modified":"2025-07-12T13:18:47","modified_gmt":"2025-07-12T13:18:47","slug":"which-of-the-following-is-a-dobereiners-triads","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/12\/which-of-the-following-is-a-dobereiners-triads\/","title":{"rendered":"Which of the following is a Dobereiner&#8217;s Triads"},"content":{"rendered":"\n<p>Which of the following is a Dobereiner&#8217;s Triads ? a. Li, Na, K b. Li, Sr, I c. Li, Ca, Cl d. Kr, Br, I \u2026<\/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>The correct answer is <strong>a. Li, Na, K<\/strong>.<\/p>\n\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<p>Dobereiner&#8217;s Triads refer to a concept in early chemistry, proposed by Johann Wolfgang D\u00f6bereiner in the early 19th century. D\u00f6bereiner noticed that certain groups of three elements had a particular pattern in their atomic weights. Specifically, he observed that the atomic weight of the middle element in a triad was approximately the average of the atomic weights of the other two elements.<\/p>\n\n\n\n<p>In the case of <strong>Li, Na, K<\/strong>, these elements form a triad, as the atomic weights of lithium (Li), sodium (Na), and potassium (K) follow the pattern described by D\u00f6bereiner:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Li<\/strong> (Lithium): Atomic weight = 6.94<\/li>\n\n\n\n<li><strong>Na<\/strong> (Sodium): Atomic weight = 22.99<\/li>\n\n\n\n<li><strong>K<\/strong> (Potassium): Atomic weight = 39.10<\/li>\n<\/ul>\n\n\n\n<p>The atomic weight of sodium is close to the average of lithium and potassium: Average&nbsp;of&nbsp;Li&nbsp;and&nbsp;K=6.94+39.102=23.02\\text{Average of Li and K} = \\frac{6.94 + 39.10}{2} = 23.02Average&nbsp;of&nbsp;Li&nbsp;and&nbsp;K=26.94+39.10\u200b=23.02<\/p>\n\n\n\n<p>This shows that the middle element, sodium, fits the pattern of being the average of the first and third elements.<\/p>\n\n\n\n<p>The other options do not follow the same pattern:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>b. Li, Sr, I<\/strong>: There is no consistent relationship between the atomic weights of these elements.<\/li>\n\n\n\n<li><strong>c. Li, Ca, Cl<\/strong>: These elements do not form a triad according to D\u00f6bereiner\u2019s rules.<\/li>\n\n\n\n<li><strong>d. Kr, Br, I<\/strong>: Similarly, these elements don\u2019t fit the triad concept.<\/li>\n<\/ul>\n\n\n\n<p>Thus, <strong>Li, Na, K<\/strong> is the correct example of a Dobereiner\u2019s Triad.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/07\/learnexams-banner6-385.jpeg\" alt=\"\" class=\"wp-image-254405\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Which of the following is a Dobereiner&#8217;s Triads ? a. Li, Na, K b. Li, Sr, I c. Li, Ca, Cl d. Kr, Br, I \u2026 The Correct Answer and Explanation is: The correct answer is a. Li, Na, K. Explanation: Dobereiner&#8217;s Triads refer to a concept in early chemistry, proposed by Johann Wolfgang D\u00f6bereiner [&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-254404","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/254404","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=254404"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/254404\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=254404"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=254404"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=254404"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}