{"id":88361,"date":"2025-06-01T07:08:45","date_gmt":"2025-06-01T07:08:45","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88361"},"modified":"2025-06-01T07:08:45","modified_gmt":"2025-06-01T07:08:45","slug":"the-species-that-has-the-same-number-of-electrons-as-35-17-cl-is","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-species-that-has-the-same-number-of-electrons-as-35-17-cl-is\/","title":{"rendered":"The species that has the same number of electrons as 35 17 Cl is"},"content":{"rendered":"

The species that has the same number of electrons as 35<\/sup>17<\/sub>Cl is<\/p>\n

[amp_mcq option1=”32<\/sup>16<\/sub>S” option2=”34<\/sup>16<\/sub>S+<\/sup>” option3=”40<\/sup>18<\/sub>Ar+<\/sup>” option4=”35<\/sup>16<\/sub>S2-<\/sup>” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2017<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe number of electrons in a neutral atom is equal to its atomic number (the subscript). For an ion, the number of electrons is adjusted based on the charge.
\n<\/section>\n
\nThe species is 35<\/sup>17<\/sub>Cl. The atomic number is 17, so a neutral Chlorine atom has 17 protons and 17 electrons. We need to find the species with 17 electrons.
\nA) 32<\/sup>16<\/sub>S: Atomic number 16. Neutral Sulfur has 16 electrons.
\nB) 34<\/sup>16<\/sub>S+<\/sup>: Atomic number 16. Neutral Sulfur has 16 electrons. S\u207a means it lost 1 electron (16 – 1 = 15 electrons).
\nC) 40<\/sup>18<\/sub>Ar+<\/sup>: Atomic number 18. Neutral Argon has 18 electrons. Ar\u207a means it lost 1 electron (18 – 1 = 17 electrons).
\nD) 35<\/sup>16<\/sub>S2-<\/sup>: Atomic number 16. Neutral Sulfur has 16 electrons. S\u00b2\u207b means it gained 2 electrons (16 + 2 = 18 electrons).
\nTherefore, 40<\/sup>18<\/sub>Ar+<\/sup> has 17 electrons, the same number as neutral 35<\/sup>17<\/sub>Cl. These species are isoelectronic.
\n<\/section>\n
\nThe superscript number (mass number) is the sum of protons and neutrons and is irrelevant to the number of electrons in this calculation, unless isotopes are being considered, which is not the case here for electron count. The subscript number is the atomic number, which is crucial as it determines the number of protons and thus the number of electrons in a neutral atom.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

The species that has the same number of electrons as 3517Cl is [amp_mcq option1=”3216S” option2=”3416S+” option3=”4018Ar+” option4=”3516S2-” correct=”option3″] This question was previously asked in UPSC NDA-2 – 2017 Download PDFAttempt Online The number of electrons in a neutral atom is equal to its atomic number (the subscript). For an ion, the number of electrons is … <\/p>\n

Detailed SolutionThe species that has the same number of electrons as 35 17 Cl is<\/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":[1094],"tags":[1101,1162,1096],"class_list":["post-88361","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1101","tag-atomic-structure","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nThe species that has the same number of electrons as 35 17 Cl is<\/title>\n<meta name=\"description\" content=\"The number of electrons in a neutral atom is equal to its atomic number (the subscript). For an ion, the number of electrons is adjusted based on the charge. The species is 3517Cl. The atomic number is 17, so a neutral Chlorine atom has 17 protons and 17 electrons. We need to find the species with 17 electrons. A) 3216S: Atomic number 16. Neutral Sulfur has 16 electrons. B) 3416S+: Atomic number 16. Neutral Sulfur has 16 electrons. S\u207a means it lost 1 electron (16 - 1 = 15 electrons). C) 4018Ar+: Atomic number 18. Neutral Argon has 18 electrons. Ar\u207a means it lost 1 electron (18 - 1 = 17 electrons). D) 3516S2-: Atomic number 16. Neutral Sulfur has 16 electrons. S\u00b2\u207b means it gained 2 electrons (16 + 2 = 18 electrons). Therefore, 4018Ar+ has 17 electrons, the same number as neutral 3517Cl. These species are isoelectronic.\" \/>\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-species-that-has-the-same-number-of-electrons-as-35-17-cl-is\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The species that has the same number of electrons as 35 17 Cl is\" \/>\n<meta property=\"og:description\" content=\"The number of electrons in a neutral atom is equal to its atomic number (the subscript). For an ion, the number of electrons is adjusted based on the charge. The species is 3517Cl. The atomic number is 17, so a neutral Chlorine atom has 17 protons and 17 electrons. We need to find the species with 17 electrons. A) 3216S: Atomic number 16. Neutral Sulfur has 16 electrons. B) 3416S+: Atomic number 16. Neutral Sulfur has 16 electrons. S\u207a means it lost 1 electron (16 - 1 = 15 electrons). C) 4018Ar+: Atomic number 18. Neutral Argon has 18 electrons. Ar\u207a means it lost 1 electron (18 - 1 = 17 electrons). D) 3516S2-: Atomic number 16. Neutral Sulfur has 16 electrons. S\u00b2\u207b means it gained 2 electrons (16 + 2 = 18 electrons). Therefore, 4018Ar+ has 17 electrons, the same number as neutral 3517Cl. These species are isoelectronic.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-species-that-has-the-same-number-of-electrons-as-35-17-cl-is\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:08:45+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 species that has the same number of electrons as 35 17 Cl is","description":"The number of electrons in a neutral atom is equal to its atomic number (the subscript). For an ion, the number of electrons is adjusted based on the charge. The species is 3517Cl. The atomic number is 17, so a neutral Chlorine atom has 17 protons and 17 electrons. We need to find the species with 17 electrons. A) 3216S: Atomic number 16. Neutral Sulfur has 16 electrons. B) 3416S+: Atomic number 16. Neutral Sulfur has 16 electrons. S\u207a means it lost 1 electron (16 - 1 = 15 electrons). C) 4018Ar+: Atomic number 18. Neutral Argon has 18 electrons. Ar\u207a means it lost 1 electron (18 - 1 = 17 electrons). D) 3516S2-: Atomic number 16. Neutral Sulfur has 16 electrons. S\u00b2\u207b means it gained 2 electrons (16 + 2 = 18 electrons). Therefore, 4018Ar+ has 17 electrons, the same number as neutral 3517Cl. These species are isoelectronic.","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-species-that-has-the-same-number-of-electrons-as-35-17-cl-is\/","og_locale":"en_US","og_type":"article","og_title":"The species that has the same number of electrons as 35 17 Cl is","og_description":"The number of electrons in a neutral atom is equal to its atomic number (the subscript). For an ion, the number of electrons is adjusted based on the charge. The species is 3517Cl. The atomic number is 17, so a neutral Chlorine atom has 17 protons and 17 electrons. We need to find the species with 17 electrons. A) 3216S: Atomic number 16. Neutral Sulfur has 16 electrons. B) 3416S+: Atomic number 16. Neutral Sulfur has 16 electrons. S\u207a means it lost 1 electron (16 - 1 = 15 electrons). C) 4018Ar+: Atomic number 18. Neutral Argon has 18 electrons. Ar\u207a means it lost 1 electron (18 - 1 = 17 electrons). D) 3516S2-: Atomic number 16. Neutral Sulfur has 16 electrons. S\u00b2\u207b means it gained 2 electrons (16 + 2 = 18 electrons). Therefore, 4018Ar+ has 17 electrons, the same number as neutral 3517Cl. These species are isoelectronic.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/the-species-that-has-the-same-number-of-electrons-as-35-17-cl-is\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:08:45+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-species-that-has-the-same-number-of-electrons-as-35-17-cl-is\/","url":"https:\/\/exam.pscnotes.com\/mcq\/the-species-that-has-the-same-number-of-electrons-as-35-17-cl-is\/","name":"The species that has the same number of electrons as 35 17 Cl is","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:08:45+00:00","dateModified":"2025-06-01T07:08:45+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The number of electrons in a neutral atom is equal to its atomic number (the subscript). For an ion, the number of electrons is adjusted based on the charge. The species is 3517Cl. The atomic number is 17, so a neutral Chlorine atom has 17 protons and 17 electrons. We need to find the species with 17 electrons. A) 3216S: Atomic number 16. Neutral Sulfur has 16 electrons. B) 3416S+: Atomic number 16. Neutral Sulfur has 16 electrons. S\u207a means it lost 1 electron (16 - 1 = 15 electrons). C) 4018Ar+: Atomic number 18. Neutral Argon has 18 electrons. Ar\u207a means it lost 1 electron (18 - 1 = 17 electrons). D) 3516S2-: Atomic number 16. Neutral Sulfur has 16 electrons. S\u00b2\u207b means it gained 2 electrons (16 + 2 = 18 electrons). Therefore, 4018Ar+ has 17 electrons, the same number as neutral 3517Cl. These species are isoelectronic.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/the-species-that-has-the-same-number-of-electrons-as-35-17-cl-is\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/the-species-that-has-the-same-number-of-electrons-as-35-17-cl-is\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/the-species-that-has-the-same-number-of-electrons-as-35-17-cl-is\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC NDA-2","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-nda-2\/"},{"@type":"ListItem","position":3,"name":"The species that has the same number of electrons as 35 17 Cl is"}]},{"@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\/88361","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=88361"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/88361\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=88361"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=88361"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=88361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}