{"id":87002,"date":"2025-06-01T04:26:03","date_gmt":"2025-06-01T04:26:03","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87002"},"modified":"2025-06-01T04:26:03","modified_gmt":"2025-06-01T04:26:03","slug":"which-one-of-the-following-is-the-correct-electronic-configuration-of","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-electronic-configuration-of\/","title":{"rendered":"Which one of the following is the correct electronic configuration of"},"content":{"rendered":"

Which one of the following is the correct electronic configuration of copper?<\/p>\n

[amp_mcq option1=”1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9” option2=”1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u20794s\u00b2” option3=”1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b2” option4=”1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u20784s\u00b2” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC Geoscientist – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nCopper (Cu) has an atomic number of 29. The Aufbau principle and Hund’s rule predict the filling of orbitals in increasing order of energy. The expected electronic configuration based on the strict Aufbau principle would be 1s\u00b22s\u00b22p\u20763s\u00b23p\u20764s\u00b23d\u2079.
\nHowever, elements like Copper (and Chromium) are exceptions to this rule. There is a slight energy difference between the 4s and 3d orbitals. The configuration with a completely filled or half-filled d subshell is more stable than one that is nearly filled.
\nIn the case of Copper, promoting one electron from the 4s orbital to the 3d orbital results in the configuration 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9. This configuration has a stable, completely filled 3d subshell and a half-filled 4s subshell, which is energetically more favorable than the 3d\u20794s\u00b2 configuration.
\nTherefore, the correct electronic configuration of copper is 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9.
\n<\/section>\n
\nCopper is an exception to the standard Aufbau principle; its ground state electronic configuration involves the transfer of an electron from the 4s to the 3d orbital to achieve a more stable completely filled 3d subshell.
\n<\/section>\n
\nOther elements exhibiting similar exceptions include Chromium (Cr, Z=24) with configuration [Ar] 3d\u2075 4s\u00b9 instead of [Ar] 3d\u2074 4s\u00b2. These exceptions highlight the complex interplay of electron-electron repulsion and orbital energies.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following is the correct electronic configuration of copper? [amp_mcq option1=”1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9” option2=”1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u20794s\u00b2” option3=”1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b2” option4=”1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u20784s\u00b2” correct=”option1″] This question was previously asked in UPSC Geoscientist – 2023 Download PDFAttempt Online Copper (Cu) has an atomic number of 29. The Aufbau principle and Hund’s rule predict the filling of orbitals in increasing order of energy. … <\/p>\n

Detailed SolutionWhich one of the following is the correct electronic configuration of<\/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":[1105,1162,1096],"class_list":["post-87002","post","type-post","status-publish","format-standard","hentry","category-upsc-geoscientist","tag-1105","tag-atomic-structure","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nWhich one of the following is the correct electronic configuration of<\/title>\n<meta name=\"description\" content=\"Copper (Cu) has an atomic number of 29. The Aufbau principle and Hund's rule predict the filling of orbitals in increasing order of energy. The expected electronic configuration based on the strict Aufbau principle would be 1s\u00b22s\u00b22p\u20763s\u00b23p\u20764s\u00b23d\u2079. However, elements like Copper (and Chromium) are exceptions to this rule. There is a slight energy difference between the 4s and 3d orbitals. The configuration with a completely filled or half-filled d subshell is more stable than one that is nearly filled. In the case of Copper, promoting one electron from the 4s orbital to the 3d orbital results in the configuration 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9. This configuration has a stable, completely filled 3d subshell and a half-filled 4s subshell, which is energetically more favorable than the 3d\u20794s\u00b2 configuration. Therefore, the correct electronic configuration of copper is 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9. Copper is an exception to the standard Aufbau principle; its ground state electronic configuration involves the transfer of an electron from the 4s to the 3d orbital to achieve a more stable completely filled 3d 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-of-the-following-is-the-correct-electronic-configuration-of\/\" \/>\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 is the correct electronic configuration of\" \/>\n<meta property=\"og:description\" content=\"Copper (Cu) has an atomic number of 29. The Aufbau principle and Hund's rule predict the filling of orbitals in increasing order of energy. The expected electronic configuration based on the strict Aufbau principle would be 1s\u00b22s\u00b22p\u20763s\u00b23p\u20764s\u00b23d\u2079. However, elements like Copper (and Chromium) are exceptions to this rule. There is a slight energy difference between the 4s and 3d orbitals. The configuration with a completely filled or half-filled d subshell is more stable than one that is nearly filled. In the case of Copper, promoting one electron from the 4s orbital to the 3d orbital results in the configuration 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9. This configuration has a stable, completely filled 3d subshell and a half-filled 4s subshell, which is energetically more favorable than the 3d\u20794s\u00b2 configuration. Therefore, the correct electronic configuration of copper is 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9. Copper is an exception to the standard Aufbau principle; its ground state electronic configuration involves the transfer of an electron from the 4s to the 3d orbital to achieve a more stable completely filled 3d subshell.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-electronic-configuration-of\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T04:26:03+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 is the correct electronic configuration of","description":"Copper (Cu) has an atomic number of 29. The Aufbau principle and Hund's rule predict the filling of orbitals in increasing order of energy. The expected electronic configuration based on the strict Aufbau principle would be 1s\u00b22s\u00b22p\u20763s\u00b23p\u20764s\u00b23d\u2079. However, elements like Copper (and Chromium) are exceptions to this rule. There is a slight energy difference between the 4s and 3d orbitals. The configuration with a completely filled or half-filled d subshell is more stable than one that is nearly filled. In the case of Copper, promoting one electron from the 4s orbital to the 3d orbital results in the configuration 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9. This configuration has a stable, completely filled 3d subshell and a half-filled 4s subshell, which is energetically more favorable than the 3d\u20794s\u00b2 configuration. Therefore, the correct electronic configuration of copper is 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9. Copper is an exception to the standard Aufbau principle; its ground state electronic configuration involves the transfer of an electron from the 4s to the 3d orbital to achieve a more stable completely filled 3d 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-of-the-following-is-the-correct-electronic-configuration-of\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following is the correct electronic configuration of","og_description":"Copper (Cu) has an atomic number of 29. The Aufbau principle and Hund's rule predict the filling of orbitals in increasing order of energy. The expected electronic configuration based on the strict Aufbau principle would be 1s\u00b22s\u00b22p\u20763s\u00b23p\u20764s\u00b23d\u2079. However, elements like Copper (and Chromium) are exceptions to this rule. There is a slight energy difference between the 4s and 3d orbitals. The configuration with a completely filled or half-filled d subshell is more stable than one that is nearly filled. In the case of Copper, promoting one electron from the 4s orbital to the 3d orbital results in the configuration 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9. This configuration has a stable, completely filled 3d subshell and a half-filled 4s subshell, which is energetically more favorable than the 3d\u20794s\u00b2 configuration. Therefore, the correct electronic configuration of copper is 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9. Copper is an exception to the standard Aufbau principle; its ground state electronic configuration involves the transfer of an electron from the 4s to the 3d orbital to achieve a more stable completely filled 3d subshell.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-electronic-configuration-of\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T04:26:03+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-is-the-correct-electronic-configuration-of\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-electronic-configuration-of\/","name":"Which one of the following is the correct electronic configuration of","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T04:26:03+00:00","dateModified":"2025-06-01T04:26:03+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Copper (Cu) has an atomic number of 29. The Aufbau principle and Hund's rule predict the filling of orbitals in increasing order of energy. The expected electronic configuration based on the strict Aufbau principle would be 1s\u00b22s\u00b22p\u20763s\u00b23p\u20764s\u00b23d\u2079. However, elements like Copper (and Chromium) are exceptions to this rule. There is a slight energy difference between the 4s and 3d orbitals. The configuration with a completely filled or half-filled d subshell is more stable than one that is nearly filled. In the case of Copper, promoting one electron from the 4s orbital to the 3d orbital results in the configuration 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9. This configuration has a stable, completely filled 3d subshell and a half-filled 4s subshell, which is energetically more favorable than the 3d\u20794s\u00b2 configuration. Therefore, the correct electronic configuration of copper is 1s\u00b22s\u00b22p\u20763s\u00b23p\u20763d\u00b9\u20704s\u00b9. Copper is an exception to the standard Aufbau principle; its ground state electronic configuration involves the transfer of an electron from the 4s to the 3d orbital to achieve a more stable completely filled 3d subshell.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-electronic-configuration-of\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-electronic-configuration-of\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-electronic-configuration-of\/#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 of the following is the correct electronic configuration of"}]},{"@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\/87002","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=87002"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/87002\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=87002"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=87002"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=87002"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}