{"id":89086,"date":"2025-06-01T07:29:06","date_gmt":"2025-06-01T07:29:06","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=89086"},"modified":"2025-06-01T07:29:06","modified_gmt":"2025-06-01T07:29:06","slug":"for-aluminium-al-atomic-number-13-mass-number-27-which-one-a","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/for-aluminium-al-atomic-number-13-mass-number-27-which-one-a\/","title":{"rendered":"For Aluminium (Al) (atomic number : 13, mass number : 27), which one a"},"content":{"rendered":"

For Aluminium (Al) (atomic number : 13, mass number : 27), which one among the following statements is NOT correct ?<\/p>\n

[amp_mcq option1=”Number of electrons present in Al is 13″ option2=”Number of protons present in Al is 13″ option3=”Number of neutrons present in Al is 14″ option4=”The valency of Al is 2″ correct=”option4″]<\/p>\n

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\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2024<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nFor a neutral atom, the number of protons is equal to the atomic number (Z), and the number of electrons is also equal to the atomic number. Given the atomic number of Aluminium (Al) is 13, it has 13 protons and 13 electrons. The mass number (A) is the sum of protons and neutrons. Given the mass number is 27 and the number of protons is 13, the number of neutrons is 27 – 13 = 14. Aluminium is in Group 13 of the periodic table, with electronic configuration 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u00b9. It readily loses its 3 valence electrons to form a stable Al\u00b3\u207a ion. Therefore, the typical valency of Aluminium is 3, not 2.
\n<\/section>\n
\nAtomic number = Number of protons. For a neutral atom, Number of electrons = Number of protons. Mass number = Number of protons + Number of neutrons. Valency is related to the number of electrons an atom gains, loses, or shares to form chemical bonds.
\n<\/section>\n
\nElements in Group 13 (like Aluminium) typically exhibit a valency of +3, forming ions with a +3 charge by losing their three valence electrons.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

For Aluminium (Al) (atomic number : 13, mass number : 27), which one among the following statements is NOT correct ? [amp_mcq option1=”Number of electrons present in Al is 13″ option2=”Number of protons present in Al is 13″ option3=”Number of neutrons present in Al is 14″ option4=”The valency of Al is 2″ correct=”option4″] This question … <\/p>\n

Detailed SolutionFor Aluminium (Al) (atomic number : 13, mass number : 27), which one a<\/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":[1103,1162,1096],"class_list":["post-89086","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1103","tag-atomic-structure","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nFor Aluminium (Al) (atomic number : 13, mass number : 27), which one a<\/title>\n<meta name=\"description\" content=\"For a neutral atom, the number of protons is equal to the atomic number (Z), and the number of electrons is also equal to the atomic number. Given the atomic number of Aluminium (Al) is 13, it has 13 protons and 13 electrons. The mass number (A) is the sum of protons and neutrons. Given the mass number is 27 and the number of protons is 13, the number of neutrons is 27 - 13 = 14. Aluminium is in Group 13 of the periodic table, with electronic configuration 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u00b9. It readily loses its 3 valence electrons to form a stable Al\u00b3\u207a ion. Therefore, the typical valency of Aluminium is 3, not 2. Atomic number = Number of protons. For a neutral atom, Number of electrons = Number of protons. Mass number = Number of protons + Number of neutrons. Valency is related to the number of electrons an atom gains, loses, or shares to form chemical bonds.\" \/>\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\/for-aluminium-al-atomic-number-13-mass-number-27-which-one-a\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"For Aluminium (Al) (atomic number : 13, mass number : 27), which one a\" \/>\n<meta property=\"og:description\" content=\"For a neutral atom, the number of protons is equal to the atomic number (Z), and the number of electrons is also equal to the atomic number. Given the atomic number of Aluminium (Al) is 13, it has 13 protons and 13 electrons. The mass number (A) is the sum of protons and neutrons. Given the mass number is 27 and the number of protons is 13, the number of neutrons is 27 - 13 = 14. Aluminium is in Group 13 of the periodic table, with electronic configuration 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u00b9. It readily loses its 3 valence electrons to form a stable Al\u00b3\u207a ion. Therefore, the typical valency of Aluminium is 3, not 2. Atomic number = Number of protons. For a neutral atom, Number of electrons = Number of protons. Mass number = Number of protons + Number of neutrons. Valency is related to the number of electrons an atom gains, loses, or shares to form chemical bonds.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/for-aluminium-al-atomic-number-13-mass-number-27-which-one-a\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:29:06+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":"For Aluminium (Al) (atomic number : 13, mass number : 27), which one a","description":"For a neutral atom, the number of protons is equal to the atomic number (Z), and the number of electrons is also equal to the atomic number. Given the atomic number of Aluminium (Al) is 13, it has 13 protons and 13 electrons. The mass number (A) is the sum of protons and neutrons. Given the mass number is 27 and the number of protons is 13, the number of neutrons is 27 - 13 = 14. Aluminium is in Group 13 of the periodic table, with electronic configuration 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u00b9. It readily loses its 3 valence electrons to form a stable Al\u00b3\u207a ion. Therefore, the typical valency of Aluminium is 3, not 2. Atomic number = Number of protons. For a neutral atom, Number of electrons = Number of protons. Mass number = Number of protons + Number of neutrons. Valency is related to the number of electrons an atom gains, loses, or shares to form chemical bonds.","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\/for-aluminium-al-atomic-number-13-mass-number-27-which-one-a\/","og_locale":"en_US","og_type":"article","og_title":"For Aluminium (Al) (atomic number : 13, mass number : 27), which one a","og_description":"For a neutral atom, the number of protons is equal to the atomic number (Z), and the number of electrons is also equal to the atomic number. Given the atomic number of Aluminium (Al) is 13, it has 13 protons and 13 electrons. The mass number (A) is the sum of protons and neutrons. Given the mass number is 27 and the number of protons is 13, the number of neutrons is 27 - 13 = 14. Aluminium is in Group 13 of the periodic table, with electronic configuration 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u00b9. It readily loses its 3 valence electrons to form a stable Al\u00b3\u207a ion. Therefore, the typical valency of Aluminium is 3, not 2. Atomic number = Number of protons. For a neutral atom, Number of electrons = Number of protons. Mass number = Number of protons + Number of neutrons. Valency is related to the number of electrons an atom gains, loses, or shares to form chemical bonds.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/for-aluminium-al-atomic-number-13-mass-number-27-which-one-a\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:29:06+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\/for-aluminium-al-atomic-number-13-mass-number-27-which-one-a\/","url":"https:\/\/exam.pscnotes.com\/mcq\/for-aluminium-al-atomic-number-13-mass-number-27-which-one-a\/","name":"For Aluminium (Al) (atomic number : 13, mass number : 27), which one a","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:29:06+00:00","dateModified":"2025-06-01T07:29:06+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"For a neutral atom, the number of protons is equal to the atomic number (Z), and the number of electrons is also equal to the atomic number. Given the atomic number of Aluminium (Al) is 13, it has 13 protons and 13 electrons. The mass number (A) is the sum of protons and neutrons. Given the mass number is 27 and the number of protons is 13, the number of neutrons is 27 - 13 = 14. Aluminium is in Group 13 of the periodic table, with electronic configuration 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u00b9. It readily loses its 3 valence electrons to form a stable Al\u00b3\u207a ion. Therefore, the typical valency of Aluminium is 3, not 2. Atomic number = Number of protons. For a neutral atom, Number of electrons = Number of protons. Mass number = Number of protons + Number of neutrons. Valency is related to the number of electrons an atom gains, loses, or shares to form chemical bonds.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/for-aluminium-al-atomic-number-13-mass-number-27-which-one-a\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/for-aluminium-al-atomic-number-13-mass-number-27-which-one-a\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/for-aluminium-al-atomic-number-13-mass-number-27-which-one-a\/#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":"For Aluminium (Al) (atomic number : 13, mass number : 27), which one a"}]},{"@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\/89086","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=89086"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/89086\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=89086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=89086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=89086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}