{"id":87587,"date":"2025-06-01T06:48:16","date_gmt":"2025-06-01T06:48:16","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87587"},"modified":"2025-06-01T06:48:16","modified_gmt":"2025-06-01T06:48:16","slug":"which-one-of-the-following-alkali-metals-has-lowest-melting-point","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-alkali-metals-has-lowest-melting-point\/","title":{"rendered":"Which one of the following alkali metals has lowest melting point ?"},"content":{"rendered":"

Which one of the following alkali metals has lowest melting point ?<\/p>\n

[amp_mcq option1=”Sodium” option2=”Potassium” option3=”Rubidium” option4=”Caesium” correct=”option4″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-1 – 2018<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe alkali metals are elements in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr). As we move down the group, the atomic size increases. The metallic bond strength weakens with increasing atomic size because the valence electron is further from the nucleus and shielded by more inner electron shells, leading to lower melting and boiling points. Therefore, among the given options (Sodium, Potassium, Rubidium, Caesium), Caesium (Cs) has the largest atomic size and thus the weakest metallic bonding, resulting in the lowest melting point.
\n<\/section>\n
\nMelting points of alkali metals decrease down the group due to decreasing metallic bond strength as atomic size increases.
\n<\/section>\n
\nThe melting points of the given alkali metals are approximately: Sodium (97.8 \u00b0C), Potassium (63.5 \u00b0C), Rubidium (39.3 \u00b0C), and Caesium (28.5 \u00b0C). Caesium’s melting point is just above room temperature.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following alkali metals has lowest melting point ? [amp_mcq option1=”Sodium” option2=”Potassium” option3=”Rubidium” option4=”Caesium” correct=”option4″] This question was previously asked in UPSC NDA-1 – 2018 Download PDFAttempt Online The alkali metals are elements in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium … <\/p>\n

Detailed SolutionWhich one of the following alkali metals has lowest melting point ?<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1093],"tags":[1114,1096,1109],"class_list":["post-87587","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1114","tag-chemistry","tag-metals-minerals-ores-properties-uses","no-featured-image-padding"],"yoast_head":"\nWhich one of the following alkali metals has lowest melting point ?<\/title>\n<meta name=\"description\" content=\"The alkali metals are elements in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr). As we move down the group, the atomic size increases. The metallic bond strength weakens with increasing atomic size because the valence electron is further from the nucleus and shielded by more inner electron shells, leading to lower melting and boiling points. Therefore, among the given options (Sodium, Potassium, Rubidium, Caesium), Caesium (Cs) has the largest atomic size and thus the weakest metallic bonding, resulting in the lowest melting point. Melting points of alkali metals decrease down the group due to decreasing metallic bond strength as atomic size increases.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-alkali-metals-has-lowest-melting-point\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following alkali metals has lowest melting point ?\" \/>\n<meta property=\"og:description\" content=\"The alkali metals are elements in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr). As we move down the group, the atomic size increases. The metallic bond strength weakens with increasing atomic size because the valence electron is further from the nucleus and shielded by more inner electron shells, leading to lower melting and boiling points. Therefore, among the given options (Sodium, Potassium, Rubidium, Caesium), Caesium (Cs) has the largest atomic size and thus the weakest metallic bonding, resulting in the lowest melting point. Melting points of alkali metals decrease down the group due to decreasing metallic bond strength as atomic size increases.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-alkali-metals-has-lowest-melting-point\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T06:48:16+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following alkali metals has lowest melting point ?","description":"The alkali metals are elements in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr). As we move down the group, the atomic size increases. The metallic bond strength weakens with increasing atomic size because the valence electron is further from the nucleus and shielded by more inner electron shells, leading to lower melting and boiling points. Therefore, among the given options (Sodium, Potassium, Rubidium, Caesium), Caesium (Cs) has the largest atomic size and thus the weakest metallic bonding, resulting in the lowest melting point. Melting points of alkali metals decrease down the group due to decreasing metallic bond strength as atomic size increases.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-alkali-metals-has-lowest-melting-point\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following alkali metals has lowest melting point ?","og_description":"The alkali metals are elements in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr). As we move down the group, the atomic size increases. The metallic bond strength weakens with increasing atomic size because the valence electron is further from the nucleus and shielded by more inner electron shells, leading to lower melting and boiling points. Therefore, among the given options (Sodium, Potassium, Rubidium, Caesium), Caesium (Cs) has the largest atomic size and thus the weakest metallic bonding, resulting in the lowest melting point. Melting points of alkali metals decrease down the group due to decreasing metallic bond strength as atomic size increases.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-alkali-metals-has-lowest-melting-point\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T06:48:16+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-alkali-metals-has-lowest-melting-point\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-alkali-metals-has-lowest-melting-point\/","name":"Which one of the following alkali metals has lowest melting point ?","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T06:48:16+00:00","dateModified":"2025-06-01T06:48:16+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The alkali metals are elements in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr). 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