{"id":87082,"date":"2025-06-01T04:27:42","date_gmt":"2025-06-01T04:27:42","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87082"},"modified":"2025-06-01T04:27:42","modified_gmt":"2025-06-01T04:27:42","slug":"which-one-among-the-following-is-the-correct-ground-state-electronic-c","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-among-the-following-is-the-correct-ground-state-electronic-c\/","title":{"rendered":"Which one among the following is the correct ground state electronic c"},"content":{"rendered":"

Which one among the following is the correct ground state electronic configuration of Cr atom ?<\/p>\n

[amp_mcq option1=”1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2074 4s\u00b2” option2=”1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2075 4s\u00b9” option3=”1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2076 4s\u2070” option4=”1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u00b3 4s\u00b2” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC Geoscientist – 2024<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct ground state electronic configuration of a Cr (Chromium) atom is 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2075 4s\u00b9.
\n<\/section>\n
\nChromium (atomic number 24) is an exception to the standard Aufbau principle filling order. The configuration 3d\u2075 4s\u00b9 is more stable than 3d\u2074 4s\u00b2 due to the enhanced stability of a half-filled d subshell.
\n<\/section>\n
\nThe electronic configuration follows the Aufbau principle generally, filling orbitals in increasing order of energy (1s, 2s, 2p, 3s, 3p, 4s, 3d…). However, for chromium and copper, promotion of an electron from the 4s orbital to the 3d orbital leads to half-filled (d\u2075) or fully filled (d\u00b9\u2070) d subshells, which are particularly stable arrangements. The full configuration starts with the filled inner shells (equivalent to Argon, [Ar]), which is 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076, followed by 3d\u2075 4s\u00b9.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one among the following is the correct ground state electronic configuration of Cr atom ? [amp_mcq option1=”1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2074 4s\u00b2” option2=”1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2075 4s\u00b9” option3=”1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2076 4s\u2070” option4=”1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u00b3 4s\u00b2” correct=”option2″] This question was previously asked in UPSC Geoscientist – 2024 … <\/p>\n

Detailed SolutionWhich one among the following is the correct ground state electronic c<\/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":[1091],"tags":[1103,1162,1096],"class_list":["post-87082","post","type-post","status-publish","format-standard","hentry","category-upsc-geoscientist","tag-1103","tag-atomic-structure","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nWhich one among the following is the correct ground state electronic c<\/title>\n<meta name=\"description\" content=\"The correct ground state electronic configuration of a Cr (Chromium) atom is 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2075 4s\u00b9. Chromium (atomic number 24) is an exception to the standard Aufbau principle filling order. The configuration 3d\u2075 4s\u00b9 is more stable than 3d\u2074 4s\u00b2 due to the enhanced stability of a half-filled d subshell.\" \/>\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-among-the-following-is-the-correct-ground-state-electronic-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one among the following is the correct ground state electronic c\" \/>\n<meta property=\"og:description\" content=\"The correct ground state electronic configuration of a Cr (Chromium) atom is 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2075 4s\u00b9. Chromium (atomic number 24) is an exception to the standard Aufbau principle filling order. The configuration 3d\u2075 4s\u00b9 is more stable than 3d\u2074 4s\u00b2 due to the enhanced stability of a half-filled d subshell.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-among-the-following-is-the-correct-ground-state-electronic-c\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T04:27:42+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 among the following is the correct ground state electronic c","description":"The correct ground state electronic configuration of a Cr (Chromium) atom is 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2075 4s\u00b9. Chromium (atomic number 24) is an exception to the standard Aufbau principle filling order. The configuration 3d\u2075 4s\u00b9 is more stable than 3d\u2074 4s\u00b2 due to the enhanced stability of a half-filled d subshell.","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-among-the-following-is-the-correct-ground-state-electronic-c\/","og_locale":"en_US","og_type":"article","og_title":"Which one among the following is the correct ground state electronic c","og_description":"The correct ground state electronic configuration of a Cr (Chromium) atom is 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2075 4s\u00b9. Chromium (atomic number 24) is an exception to the standard Aufbau principle filling order. The configuration 3d\u2075 4s\u00b9 is more stable than 3d\u2074 4s\u00b2 due to the enhanced stability of a half-filled d subshell.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-among-the-following-is-the-correct-ground-state-electronic-c\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T04:27:42+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-among-the-following-is-the-correct-ground-state-electronic-c\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-among-the-following-is-the-correct-ground-state-electronic-c\/","name":"Which one among the following is the correct ground state electronic c","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T04:27:42+00:00","dateModified":"2025-06-01T04:27:42+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct ground state electronic configuration of a Cr (Chromium) atom is 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2075 4s\u00b9. Chromium (atomic number 24) is an exception to the standard Aufbau principle filling order. The configuration 3d\u2075 4s\u00b9 is more stable than 3d\u2074 4s\u00b2 due to the enhanced stability of a half-filled d subshell.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-among-the-following-is-the-correct-ground-state-electronic-c\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/which-one-among-the-following-is-the-correct-ground-state-electronic-c\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-among-the-following-is-the-correct-ground-state-electronic-c\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC Geoscientist","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-geoscientist\/"},{"@type":"ListItem","position":3,"name":"Which one among the following is the correct ground state electronic c"}]},{"@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\/87082","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=87082"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/87082\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=87082"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=87082"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=87082"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}