{"id":183827,"date":"2025-01-17T06:31:45","date_gmt":"2025-01-17T06:31:45","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=183827"},"modified":"2025-01-17T06:31:47","modified_gmt":"2025-01-17T06:31:47","slug":"the-electron-configuration-1s2-2s2-2p6-3s2-3p6-fits-all-of-the-following-species-except-one","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/01\/17\/the-electron-configuration-1s2-2s2-2p6-3s2-3p6-fits-all-of-the-following-species-except-one\/","title":{"rendered":"The electron configuration 1s2 2s2 2p6 3s2 3p6 fits all of the following species except one"},"content":{"rendered":"\n<p>21) The electron configuration 1s2 2s2 2p6 3s2 3p6 fits all of the following species except one. The exception is ________.<\/p>\n\n\n\n<p>A) F\u2212<\/p>\n\n\n\n<p>B) Ca2+<\/p>\n\n\n\n<p>C) S2\u2212<\/p>\n\n\n\n<p>D) P3\u2212<\/p>\n\n\n\n<p>22) What behavior is expected from an atom with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2?<\/p>\n\n\n\n<p>A) gain of 2 electrons<\/p>\n\n\n\n<p>B) loss of 2 electrons<\/p>\n\n\n\n<p>C) gain of 6 electrons<\/p>\n\n\n\n<p>D) loss of 4 electrons<\/p>\n\n\n\n<p>23) Which ion is isoelectronic with Kr?<\/p>\n\n\n\n<p>A) Cl\u2212<\/p>\n\n\n\n<p>B) O2\u2212<\/p>\n\n\n\n<p>C) Rb+<\/p>\n\n\n\n<p>D) Ba2+<\/p>\n\n\n\n<p>24) Which of the following is&nbsp;<em>not<\/em>&nbsp;isoelectronic with a noble gas?<\/p>\n\n\n\n<p>A) Li+<\/p>\n\n\n\n<p>B) Ba2+<\/p>\n\n\n\n<p>C) S\u2212<\/p>\n\n\n\n<p>D) F\u2212<\/p>\n\n\n\n<p>25) Which one of the following sets contains species that are&nbsp;<em>all<\/em>&nbsp;isoelectronic?<\/p>\n\n\n\n<p>A) O, F, Ne<\/p>\n\n\n\n<p>B) C+4, N-3, O-2<\/p>\n\n\n\n<p>C) P-3, S-2, Ar<\/p>\n\n\n\n<p>D) Na, Mg, Al<\/p>\n\n\n\n<p>26) Which of the following ions is&nbsp;<em>not isoelectronic&nbsp;<\/em>with the noble gas neon?<\/p>\n\n\n\n<p>A) O-2<\/p>\n\n\n\n<p>B) F-<\/p>\n\n\n\n<p>C) Al+3<\/p>\n\n\n\n<p>D) S-2<\/p>\n\n\n\n<p>27) Which of the following compounds contains an ion with a 3+ charge?<\/p>\n\n\n\n<p>A) KCl<\/p>\n\n\n\n<p>B) AlP<\/p>\n\n\n\n<p>C) BeF2<\/p>\n\n\n\n<p>D) BaO<\/p>\n\n\n\n<p>28) Which of the following compounds contains an ion with a 2\u2212 charge?<\/p>\n\n\n\n<p>A) AlP<\/p>\n\n\n\n<p>B) MgS<\/p>\n\n\n\n<p>C) KBr<\/p>\n\n\n\n<p>D) BaCl2<\/p>\n\n\n\n<p>29) In the formation of the ionic compound CaBr2, the number of electrons transferred from one Ca atom to two Br atoms, per formula unit, is ________.<\/p>\n\n\n\n<p>A) 1<\/p>\n\n\n\n<p>B) 2<\/p>\n\n\n\n<p>C) 3<\/p>\n\n\n\n<p>D) 4<\/p>\n\n\n\n<p>30) In the process of forming sodium nitride, Na3N, each sodium atom ________ electron(s) and each nitride atom ________ electron(s).<\/p>\n\n\n\n<p>A) loses one; gains two<\/p>\n\n\n\n<p>B) loses three; gains one<\/p>\n\n\n\n<p>C) loses three; gains three<\/p>\n\n\n\n<p>D) loses one; gains three<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>Let&#8217;s analyze each question to determine the correct answers and understand the reasoning behind them.<\/p>\n\n\n\n<p><strong>21) The electron configuration 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 fits all of the following species except one. The exception is:<\/strong><\/p>\n\n\n\n<p>This electron configuration corresponds to 18 electrons, which is the configuration of Argon (Ar). Let&#8217;s examine each species:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A) F\u207b<\/strong>: Fluorine (atomic number 9) gains one electron to become F\u207b, resulting in 10 electrons.<\/li>\n\n\n\n<li><strong>B) Ca\u00b2\u207a<\/strong>: Calcium (atomic number 20) loses two electrons to form Ca\u00b2\u207a, resulting in 18 electrons.<\/li>\n\n\n\n<li><strong>C) S\u00b2\u207b<\/strong>: Sulfur (atomic number 16) gains two electrons to form S\u00b2\u207b, resulting in 18 electrons.<\/li>\n\n\n\n<li><strong>D) P\u00b3\u207b<\/strong>: Phosphorus (atomic number 15) gains three electrons to form P\u00b3\u207b, resulting in 18 electrons.<\/li>\n<\/ul>\n\n\n\n<p>Therefore, the exception is <strong>A) F\u207b<\/strong>, as it has only 10 electrons, not 18.<\/p>\n\n\n\n<p><strong>22) What behavior is expected from an atom with the electron configuration 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 4s\u00b2?<\/strong><\/p>\n\n\n\n<p>This configuration corresponds to Calcium (Ca), which has two electrons in the 4s orbital. To achieve a stable noble gas configuration (like Argon), calcium tends to lose these two 4s electrons.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>B) loss of 2 electrons<\/strong> is the correct behavior.<\/li>\n<\/ul>\n\n\n\n<p><strong>23) Which ion is isoelectronic with Kr?<\/strong><\/p>\n\n\n\n<p>Krypton (Kr) has 36 electrons. Let&#8217;s evaluate each ion:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A) Cl\u207b<\/strong>: Chlorine (atomic number 17) gains one electron to have 18 electrons.<\/li>\n\n\n\n<li><strong>B) O\u00b2\u207b<\/strong>: Oxygen (atomic number 8) gains two electrons to have 10 electrons.<\/li>\n\n\n\n<li><strong>C) Rb\u207a<\/strong>: Rubidium (atomic number 37) loses one electron to have 36 electrons.<\/li>\n\n\n\n<li><strong>D) Ba\u00b2\u207a<\/strong>: Barium (atomic number 56) loses two electrons to have 54 electrons.<\/li>\n<\/ul>\n\n\n\n<p>Therefore, <strong>C) Rb\u207a<\/strong> is isoelectronic with Kr, as both have 36 electrons.<\/p>\n\n\n\n<p><strong>24) Which of the following is not isoelectronic with a noble gas?<\/strong><\/p>\n\n\n\n<p>Isoelectronic species have the same number of electrons as a noble gas.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A) Li\u207a<\/strong>: Lithium (atomic number 3) loses one electron to have 2 electrons, like Helium.<\/li>\n\n\n\n<li><strong>B) Ba\u00b2\u207a<\/strong>: Barium (atomic number 56) loses two electrons to have 54 electrons, like Xenon.<\/li>\n\n\n\n<li><strong>C) S\u207b<\/strong>: Sulfur (atomic number 16) gains one electron to have 17 electrons, which does not match any noble gas.<\/li>\n\n\n\n<li><strong>D) F\u207b<\/strong>: Fluorine (atomic number 9) gains one electron to have 10 electrons, like Neon.<\/li>\n<\/ul>\n\n\n\n<p>Therefore, <strong>C) S\u207b<\/strong> is not isoelectronic with a noble gas.<\/p>\n\n\n\n<p><strong>25) Which one of the following sets contains species that are all isoelectronic?<\/strong><\/p>\n\n\n\n<p>Isoelectronic species have the same number of electrons.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A) O, F, Ne<\/strong>: Oxygen (8 electrons), Fluorine (9 electrons), Neon (10 electrons).<\/li>\n\n\n\n<li><strong>B) C\u2074\u207a, N\u00b3\u207b, O\u00b2\u207b<\/strong>: Carbon ion (2 electrons), Nitrogen ion (10 electrons), Oxygen ion (10 electrons).<\/li>\n\n\n\n<li><strong>C) P\u00b3\u207b, S\u00b2\u207b, Ar<\/strong>: Phosphorus ion (18 electrons), Sulfur ion (18 electrons), Argon (18 electrons).<\/li>\n\n\n\n<li><strong>D) Na, Mg, Al<\/strong>: Sodium (11 electrons), Magnesium (12 electrons), Aluminum (13 electrons).<\/li>\n<\/ul>\n\n\n\n<p>Therefore, <strong>C) P\u00b3\u207b, S\u00b2\u207b, Ar<\/strong> are all isoelectronic with 18 electrons each.<\/p>\n\n\n\n<p><strong>26) Which of the following ions is not isoelectronic with the noble gas neon?<\/strong><\/p>\n\n\n\n<p>Neon has 10 electrons.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A) O\u00b2\u207b<\/strong>: Oxygen ion with 10 electrons.<\/li>\n\n\n\n<li><strong>B) F\u207b<\/strong>: Fluorine ion with 10 electrons.<\/li>\n\n\n\n<li><strong>C) Al\u00b3\u207a<\/strong>: Aluminum ion with 10 electrons.<\/li>\n\n\n\n<li><strong>D) S\u00b2\u207b<\/strong>: Sulfur ion with 18 electrons.<\/li>\n<\/ul>\n\n\n\n<p>Therefore, <strong>D) S\u00b2\u207b<\/strong> is not isoelectronic with neon.<\/p>\n\n\n\n<p><strong>27) Which of the following compounds contains an ion with a 3+ charge?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A) KCl<\/strong>: Contains K\u207a and Cl\u207b.<\/li>\n\n\n\n<li><strong>B) AlP<\/strong>: Contains Al\u00b3\u207a and P\u00b3\u207b.<\/li>\n\n\n\n<li><strong>C) BeF\u2082<\/strong>: Contains Be\u00b2\u207a and F\u207b.<\/li>\n\n\n\n<li><strong>D) BaO<\/strong>: Contains Ba\u00b2\u207a and O\u00b2\u207b.<\/li>\n<\/ul>\n\n\n\n<p>Therefore, <strong>B) AlP<\/strong> contains Al\u00b3\u207a, an ion with a 3+ charge.<\/p>\n\n\n\n<p><strong>28) Which of the following compounds contains an ion with a 2\u2212 charge?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A) AlP<\/strong>: Contains P\u00b3\u207b.<\/li>\n\n\n\n<li><strong>B) MgS<\/strong>:<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>21) The electron configuration 1s2 2s2 2p6 3s2 3p6 fits all of the following species except one. The exception is ________. A) F\u2212 B) Ca2+ C) S2\u2212 D) P3\u2212 22) What behavior is expected from an atom with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2? A) gain of 2 electrons B) loss of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-183827","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/183827","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=183827"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/183827\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=183827"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=183827"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=183827"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}