{"id":238965,"date":"2025-06-18T14:02:58","date_gmt":"2025-06-18T14:02:58","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=238965"},"modified":"2025-06-18T14:03:00","modified_gmt":"2025-06-18T14:03:00","slug":"which-of-the-following-has-lowest-melting-point","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/18\/which-of-the-following-has-lowest-melting-point\/","title":{"rendered":"Which of the following has lowest melting point"},"content":{"rendered":"\n<p>Which of the following has lowest melting point? A. Li B. Na C. K D. Cs<\/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: D. Cs (Cesium)<\/strong><\/p>\n\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<p>The melting point of an element refers to the temperature at which it changes from a solid to a liquid. Among the given options \u2014 lithium (Li), sodium (Na), potassium (K), and cesium (Cs) \u2014 all are members of the <strong>alkali metals group (Group 1)<\/strong> of the periodic table. Alkali metals are known for their low melting points compared to other metals, and their melting points <strong>decrease as you move down the group<\/strong> in the periodic table.<\/p>\n\n\n\n<p>Here&#8217;s a quick look at the approximate melting points of these elements:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Li (Lithium):<\/strong> 180.5\u00b0C<\/li>\n\n\n\n<li><strong>Na (Sodium):<\/strong> 97.8\u00b0C<\/li>\n\n\n\n<li><strong>K (Potassium):<\/strong> 63.5\u00b0C<\/li>\n\n\n\n<li><strong>Cs (Cesium):<\/strong> 28.5\u00b0C<\/li>\n<\/ul>\n\n\n\n<p>As you move down the group from lithium to cesium, the atomic size increases. This increase in atomic radius causes a <strong>weaker metallic bond<\/strong> between the metal atoms because the outermost electrons are further from the nucleus and less tightly held. Since metallic bonding becomes weaker, <strong>less thermal energy is required<\/strong> to overcome these bonds, resulting in a lower melting point.<\/p>\n\n\n\n<p>Cesium, being one of the largest alkali metals with a highly reactive and loosely held outer electron, has the <strong>weakest metallic bonding<\/strong> among the options. This explains why it melts at just 28.5\u00b0C \u2014 which is so low that cesium can even melt in the palm of your hand in a warm environment.<\/p>\n\n\n\n<p>In summary, cesium has the <strong>lowest melting point<\/strong> among the listed alkali metals because of its large atomic radius and weak metallic bonds, making <strong>option D<\/strong> the correct choice.<\/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-banner8-1125.jpeg\" alt=\"\" class=\"wp-image-238966\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Which of the following has lowest melting point? A. Li B. Na C. K D. Cs The Correct Answer and Explanation is: Correct Answer: D. Cs (Cesium) Explanation: The melting point of an element refers to the temperature at which it changes from a solid to a liquid. Among the given options \u2014 lithium (Li), [&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-238965","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/238965","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=238965"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/238965\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=238965"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=238965"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=238965"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}