{"id":88798,"date":"2025-06-01T07:21:25","date_gmt":"2025-06-01T07:21:25","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88798"},"modified":"2025-06-01T07:21:25","modified_gmt":"2025-06-01T07:21:25","slug":"what-is-the-maximum-number-of-electrons-in-the-m-shell","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/what-is-the-maximum-number-of-electrons-in-the-m-shell\/","title":{"rendered":"What is the maximum number of electrons in the M-Shell ?"},"content":{"rendered":"

What is the maximum number of electrons in the M-Shell ?<\/p>\n

[amp_mcq option1=”6″ option2=”8″ option3=”18″ option4=”32″ correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2021<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
Electron shells are denoted by letters K, L, M, N, … or by principal quantum numbers n = 1, 2, 3, 4, … The K-shell corresponds to n=1, the L-shell to n=2, the M-shell to n=3, and so on. The maximum number of electrons that can occupy a shell with principal quantum number ‘n’ is given by the formula $2n^2$. For the M-shell, n=3, so the maximum number of electrons is $2 \\times (3)^2 = 2 \\times 9 = 18$.<\/section>\n
The formula for the maximum number of electrons in a shell with principal quantum number ‘n’ is $2n^2$.
\nK-shell (n=1): $2 \\times 1^2 = 2$ electrons.
\nL-shell (n=2): $2 \\times 2^2 = 8$ electrons.
\nM-shell (n=3): $2 \\times 3^2 = 18$ electrons.
\nN-shell (n=4): $2 \\times 4^2 = 32$ electrons.<\/section>\n
While the formula $2n^2$ gives the maximum capacity of a shell, the actual filling of electrons follows the Aufbau principle, Hund’s rule, and the Pauli exclusion principle, which dictates the filling order based on subshells (s, p, d, f) and energy levels. The outermost shell cannot accommodate more than 8 electrons (octet rule, with some exceptions), and the second last shell cannot accommodate more than 18 electrons.<\/section>\n","protected":false},"excerpt":{"rendered":"

What is the maximum number of electrons in the M-Shell ? [amp_mcq option1=”6″ option2=”8″ option3=”18″ option4=”32″ correct=”option3″] This question was previously asked in UPSC NDA-2 – 2021 Download PDFAttempt Online Electron shells are denoted by letters K, L, M, N, … or by principal quantum numbers n = 1, 2, 3, 4, … The K-shell … <\/p>\n

Detailed SolutionWhat is the maximum number of electrons in the M-Shell ?<\/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":[1110,1162,1096],"class_list":["post-88798","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1110","tag-atomic-structure","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nWhat is the maximum number of electrons in the M-Shell ?<\/title>\n<meta name=\"description\" content=\"Electron shells are denoted by letters K, L, M, N, ... or by principal quantum numbers n = 1, 2, 3, 4, ... The K-shell corresponds to n=1, the L-shell to n=2, the M-shell to n=3, and so on. The maximum number of electrons that can occupy a shell with principal quantum number 'n' is given by the formula $2n^2$. For the M-shell, n=3, so the maximum number of electrons is $2 times (3)^2 = 2 times 9 = 18$. The formula for the maximum number of electrons in a shell with principal quantum number 'n' is $2n^2$. K-shell (n=1): $2 times 1^2 = 2$ electrons. L-shell (n=2): $2 times 2^2 = 8$ electrons. M-shell (n=3): $2 times 3^2 = 18$ electrons. N-shell (n=4): $2 times 4^2 = 32$ electrons.\" \/>\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\/what-is-the-maximum-number-of-electrons-in-the-m-shell\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is the maximum number of electrons in the M-Shell ?\" \/>\n<meta property=\"og:description\" content=\"Electron shells are denoted by letters K, L, M, N, ... or by principal quantum numbers n = 1, 2, 3, 4, ... The K-shell corresponds to n=1, the L-shell to n=2, the M-shell to n=3, and so on. The maximum number of electrons that can occupy a shell with principal quantum number 'n' is given by the formula $2n^2$. For the M-shell, n=3, so the maximum number of electrons is $2 times (3)^2 = 2 times 9 = 18$. The formula for the maximum number of electrons in a shell with principal quantum number 'n' is $2n^2$. K-shell (n=1): $2 times 1^2 = 2$ electrons. L-shell (n=2): $2 times 2^2 = 8$ electrons. M-shell (n=3): $2 times 3^2 = 18$ electrons. N-shell (n=4): $2 times 4^2 = 32$ electrons.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/what-is-the-maximum-number-of-electrons-in-the-m-shell\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:21:25+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":"What is the maximum number of electrons in the M-Shell ?","description":"Electron shells are denoted by letters K, L, M, N, ... or by principal quantum numbers n = 1, 2, 3, 4, ... The K-shell corresponds to n=1, the L-shell to n=2, the M-shell to n=3, and so on. The maximum number of electrons that can occupy a shell with principal quantum number 'n' is given by the formula $2n^2$. For the M-shell, n=3, so the maximum number of electrons is $2 times (3)^2 = 2 times 9 = 18$. The formula for the maximum number of electrons in a shell with principal quantum number 'n' is $2n^2$. K-shell (n=1): $2 times 1^2 = 2$ electrons. L-shell (n=2): $2 times 2^2 = 8$ electrons. M-shell (n=3): $2 times 3^2 = 18$ electrons. N-shell (n=4): $2 times 4^2 = 32$ electrons.","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\/what-is-the-maximum-number-of-electrons-in-the-m-shell\/","og_locale":"en_US","og_type":"article","og_title":"What is the maximum number of electrons in the M-Shell ?","og_description":"Electron shells are denoted by letters K, L, M, N, ... or by principal quantum numbers n = 1, 2, 3, 4, ... The K-shell corresponds to n=1, the L-shell to n=2, the M-shell to n=3, and so on. The maximum number of electrons that can occupy a shell with principal quantum number 'n' is given by the formula $2n^2$. For the M-shell, n=3, so the maximum number of electrons is $2 times (3)^2 = 2 times 9 = 18$. The formula for the maximum number of electrons in a shell with principal quantum number 'n' is $2n^2$. K-shell (n=1): $2 times 1^2 = 2$ electrons. L-shell (n=2): $2 times 2^2 = 8$ electrons. M-shell (n=3): $2 times 3^2 = 18$ electrons. N-shell (n=4): $2 times 4^2 = 32$ electrons.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/what-is-the-maximum-number-of-electrons-in-the-m-shell\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:21:25+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\/what-is-the-maximum-number-of-electrons-in-the-m-shell\/","url":"https:\/\/exam.pscnotes.com\/mcq\/what-is-the-maximum-number-of-electrons-in-the-m-shell\/","name":"What is the maximum number of electrons in the M-Shell ?","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:21:25+00:00","dateModified":"2025-06-01T07:21:25+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Electron shells are denoted by letters K, L, M, N, ... or by principal quantum numbers n = 1, 2, 3, 4, ... The K-shell corresponds to n=1, the L-shell to n=2, the M-shell to n=3, and so on. The maximum number of electrons that can occupy a shell with principal quantum number 'n' is given by the formula $2n^2$. For the M-shell, n=3, so the maximum number of electrons is $2 \\times (3)^2 = 2 \\times 9 = 18$. The formula for the maximum number of electrons in a shell with principal quantum number 'n' is $2n^2$. K-shell (n=1): $2 \\times 1^2 = 2$ electrons. L-shell (n=2): $2 \\times 2^2 = 8$ electrons. M-shell (n=3): $2 \\times 3^2 = 18$ electrons. N-shell (n=4): $2 \\times 4^2 = 32$ electrons.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/what-is-the-maximum-number-of-electrons-in-the-m-shell\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/what-is-the-maximum-number-of-electrons-in-the-m-shell\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/what-is-the-maximum-number-of-electrons-in-the-m-shell\/#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":"What is the maximum number of electrons in the M-Shell ?"}]},{"@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\/88798","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=88798"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/88798\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=88798"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=88798"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=88798"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}