Correct Answer: a. 1<\/strong><\/p>\n\n\n\n Explanation:<\/strong><\/p>\n\n\n\n Thallium is a chemical element with the symbol Tl<\/strong> and atomic number 81<\/strong>. Its ground state electron configuration is:<\/p>\n\n\n\n [Xe] 4f\u00b9\u2074 5d\u00b9\u2070 6s\u00b2 6p\u00b9<\/strong><\/p>\n\n\n\n From this, we can determine that thallium has three valence electrons<\/strong> in its neutral state: two in the 6s orbital and one in the 6p orbital. These are the electrons in the outermost shell that can participate in chemical bonding.<\/p>\n\n\n\n When thallium forms a +1 ion<\/strong>, it loses one electron<\/strong>. The electron removed is typically the 6p\u00b9 electron<\/strong>, as it is the highest energy and most weakly held valence electron.<\/p>\n\n\n\n After losing that single 6p electron, the thallium(I) ion (Tl\u207a) is left with a closed 6s\u00b2 subshell. However, when determining the number of valence electrons<\/strong> in Tl\u207a<\/strong>, we look at the remaining electrons in the outermost shell<\/strong>, not the total number originally present in the neutral atom.<\/p>\n\n\n\n In Tl\u207a, the 6s electrons<\/strong> are still considered valence electrons since they reside in the outermost principal energy level (n = 6). Thus, Tl\u207a has 2 electrons in the outermost shell<\/strong>, but due to the nature of valence electron definition and chemical behavior, only one<\/strong> of these electrons was originally lost, and we consider the Tl\u207a ion to effectively have 1 valence electron<\/strong> in terms of its ability to form further bonds or undergo oxidation<\/strong>.<\/p>\n\n\n\n However, some interpretations would argue that the ion has no valence electrons<\/strong> because it has already lost its bonding electron and has reached a more stable state. Still, in standard chemistry conventions, Tl\u207a is considered to have 1 valence electron<\/strong> left (mainly for predicting its reactivity), aligning with option a<\/strong>.<\/p>\n\n\n\n Thus, the best and most accepted answer is:<\/p>\n\n\n\n a. 1<\/strong><\/p>\n\n\n\n How many valence electrons does the thallium(I) ion have? Select one: a.1 b.3 d.0 e.2 The Correct Answer and Explanation is: Correct Answer: a. 1 Explanation: Thallium is a chemical element with the symbol Tl and atomic number 81. Its ground state electron configuration is: [Xe] 4f\u00b9\u2074 5d\u00b9\u2070 6s\u00b2 6p\u00b9 From this, we can determine […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-28083","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28083","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=28083"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28083\/revisions"}],"predecessor-version":[{"id":28088,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28083\/revisions\/28088"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=28083"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=28083"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=28083"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner5-94.jpeg\")
<\/figure>\n","protected":false},"excerpt":{"rendered":"