{"id":86529,"date":"2025-06-01T03:49:43","date_gmt":"2025-06-01T03:49:43","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=86529"},"modified":"2025-06-01T03:49:43","modified_gmt":"2025-06-01T03:49:43","slug":"the-two-isotopes-of-elemental-chlorine-are","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-two-isotopes-of-elemental-chlorine-are\/","title":{"rendered":"The two isotopes of elemental chlorine are :"},"content":{"rendered":"

The two isotopes of elemental chlorine are :<\/p>\n

[amp_mcq option1=”$^{35}_{17}$C and $^{36}_{17}$C” option2=”$^{34}_{17}$C and $^{36}_{18}$C” option3=”$^{35}_{17}$C and $^{37}_{18}$C” option4=”$^{35}_{17}$C and $^{37}_{17}$C” correct=”option4″]<\/p>\n

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\n
This question was previously asked in<\/div>\n
UPSC CDS-2 – 2024<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nIsotopes of an element are atoms that have the same number of protons (atomic number) but different numbers of neutrons (leading to different mass numbers). The atomic number is represented by the subscript, and the mass number by the superscript before the element symbol. Chlorine (Cl) has an atomic number of 17. Assuming the element symbol ‘C’ in the options is a typo for ‘Cl’, option D, $^{35}_{17}$C and $^{37}_{17}$C, correctly shows the same atomic number (17) but different mass numbers (35 and 37), fitting the definition of isotopes of Chlorine-17.
\n<\/section>\n
\n– Atomic number (number of protons) defines the element.
\n– Mass number is the sum of protons and neutrons.
\n– Isotopes of the same element have the same atomic number but different mass numbers.
\n<\/section>\n
\nNaturally occurring chlorine is a mixture of two main isotopes: $^{35}_{17}$Cl (approximately 75.77% abundance) and $^{37}_{17}$Cl (approximately 24.23% abundance). The average atomic mass of chlorine is approximately 35.45 u.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

The two isotopes of elemental chlorine are : [amp_mcq option1=”$^{35}_{17}$C and $^{36}_{17}$C” option2=”$^{34}_{17}$C and $^{36}_{18}$C” option3=”$^{35}_{17}$C and $^{37}_{18}$C” option4=”$^{35}_{17}$C and $^{37}_{17}$C” correct=”option4″] This question was previously asked in UPSC CDS-2 – 2024 Download PDFAttempt Online Isotopes of an element are atoms that have the same number of protons (atomic number) but different numbers of neutrons … <\/p>\n

Detailed SolutionThe two isotopes of elemental chlorine are :<\/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":[1088],"tags":[1103,1162,1096],"class_list":["post-86529","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-2","tag-1103","tag-atomic-structure","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nThe two isotopes of elemental chlorine are :<\/title>\n<meta name=\"description\" content=\"Isotopes of an element are atoms that have the same number of protons (atomic number) but different numbers of neutrons (leading to different mass numbers). The atomic number is represented by the subscript, and the mass number by the superscript before the element symbol. Chlorine (Cl) has an atomic number of 17. Assuming the element symbol 'C' in the options is a typo for 'Cl', option D, $^{35}_{17}$C and $^{37}_{17}$C, correctly shows the same atomic number (17) but different mass numbers (35 and 37), fitting the definition of isotopes of Chlorine-17. - Atomic number (number of protons) defines the element. - Mass number is the sum of protons and neutrons. - Isotopes of the same element have the same atomic number but different mass numbers.\" \/>\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\/the-two-isotopes-of-elemental-chlorine-are\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The two isotopes of elemental chlorine are :\" \/>\n<meta property=\"og:description\" content=\"Isotopes of an element are atoms that have the same number of protons (atomic number) but different numbers of neutrons (leading to different mass numbers). The atomic number is represented by the subscript, and the mass number by the superscript before the element symbol. Chlorine (Cl) has an atomic number of 17. Assuming the element symbol 'C' in the options is a typo for 'Cl', option D, $^{35}_{17}$C and $^{37}_{17}$C, correctly shows the same atomic number (17) but different mass numbers (35 and 37), fitting the definition of isotopes of Chlorine-17. - Atomic number (number of protons) defines the element. - Mass number is the sum of protons and neutrons. - Isotopes of the same element have the same atomic number but different mass numbers.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-two-isotopes-of-elemental-chlorine-are\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:49:43+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":"The two isotopes of elemental chlorine are :","description":"Isotopes of an element are atoms that have the same number of protons (atomic number) but different numbers of neutrons (leading to different mass numbers). The atomic number is represented by the subscript, and the mass number by the superscript before the element symbol. Chlorine (Cl) has an atomic number of 17. Assuming the element symbol 'C' in the options is a typo for 'Cl', option D, $^{35}_{17}$C and $^{37}_{17}$C, correctly shows the same atomic number (17) but different mass numbers (35 and 37), fitting the definition of isotopes of Chlorine-17. - Atomic number (number of protons) defines the element. - Mass number is the sum of protons and neutrons. - Isotopes of the same element have the same atomic number but different mass numbers.","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\/the-two-isotopes-of-elemental-chlorine-are\/","og_locale":"en_US","og_type":"article","og_title":"The two isotopes of elemental chlorine are :","og_description":"Isotopes of an element are atoms that have the same number of protons (atomic number) but different numbers of neutrons (leading to different mass numbers). The atomic number is represented by the subscript, and the mass number by the superscript before the element symbol. Chlorine (Cl) has an atomic number of 17. Assuming the element symbol 'C' in the options is a typo for 'Cl', option D, $^{35}_{17}$C and $^{37}_{17}$C, correctly shows the same atomic number (17) but different mass numbers (35 and 37), fitting the definition of isotopes of Chlorine-17. - Atomic number (number of protons) defines the element. - Mass number is the sum of protons and neutrons. - Isotopes of the same element have the same atomic number but different mass numbers.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/the-two-isotopes-of-elemental-chlorine-are\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:49:43+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\/the-two-isotopes-of-elemental-chlorine-are\/","url":"https:\/\/exam.pscnotes.com\/mcq\/the-two-isotopes-of-elemental-chlorine-are\/","name":"The two isotopes of elemental chlorine are :","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T03:49:43+00:00","dateModified":"2025-06-01T03:49:43+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Isotopes of an element are atoms that have the same number of protons (atomic number) but different numbers of neutrons (leading to different mass numbers). 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Assuming the element symbol 'C' in the options is a typo for 'Cl', option D, $^{35}_{17}$C and $^{37}_{17}$C, correctly shows the same atomic number (17) but different mass numbers (35 and 37), fitting the definition of isotopes of Chlorine-17. - Atomic number (number of protons) defines the element. - Mass number is the sum of protons and neutrons. - Isotopes of the same element have the same atomic number but different mass numbers.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/the-two-isotopes-of-elemental-chlorine-are\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/the-two-isotopes-of-elemental-chlorine-are\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/the-two-isotopes-of-elemental-chlorine-are\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CDS-2","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-cds-2\/"},{"@type":"ListItem","position":3,"name":"The two isotopes of elemental chlorine are :"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/86529","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=86529"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/86529\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=86529"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=86529"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=86529"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}