{"id":26310,"date":"2025-06-19T12:13:23","date_gmt":"2025-06-19T12:13:23","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=26310"},"modified":"2025-06-19T12:13:27","modified_gmt":"2025-06-19T12:13:27","slug":"which-element-ion-has-this-electron-configuration","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/which-element-ion-has-this-electron-configuration\/","title":{"rendered":"Which element\/ion has this electron configuration"},"content":{"rendered":"\n<p>Which element\/ion has this electron configuration: [1s22s22p63s23p6]+2 Group of answer choices argon (neutral) sulfur calcium ion chlorine potassium ion potassium (neutral)<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>The correct answer is: <strong>calcium ion (Ca\u00b2\u207a)<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>To determine which element or ion has the electron configuration <strong>[1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076]\u207a\u00b2<\/strong>, we first count the total number of electrons in the configuration.<\/p>\n\n\n\n<p>Let\u2019s break it down:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1s\u00b2 \u2192 2 electrons<\/li>\n\n\n\n<li>2s\u00b2 \u2192 2 electrons<\/li>\n\n\n\n<li>2p\u2076 \u2192 6 electrons<\/li>\n\n\n\n<li>3s\u00b2 \u2192 2 electrons<\/li>\n\n\n\n<li>3p\u2076 \u2192 6 electrons<\/li>\n<\/ul>\n\n\n\n<p>Total = 2 + 2 + 6 + 2 + 6 = <strong>18 electrons<\/strong><\/p>\n\n\n\n<p>Now we look at the periodic table to identify which <strong>neutral<\/strong> element has <strong>20 electrons<\/strong>, because if an element has lost two electrons to form a +2 charge, it must have originally had 20 electrons in its neutral state. That element is <strong>calcium (Ca)<\/strong>, which has an atomic number of 20.<\/p>\n\n\n\n<p>So, when calcium becomes a <strong>Ca\u00b2\u207a ion<\/strong>, it loses two electrons. The two electrons lost are from the outermost shell, which in calcium\u2019s case are the <strong>4s<\/strong> electrons. The full electron configuration of neutral calcium is:<br><strong>1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 4s\u00b2<\/strong><\/p>\n\n\n\n<p>When it loses two electrons to form Ca\u00b2\u207a, the configuration becomes:<br><strong>1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076<\/strong><\/p>\n\n\n\n<p>This matches exactly the given configuration.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Why the other options are incorrect:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Argon (neutral)<\/strong>: Argon has 18 electrons, and the configuration is the same, but it is <strong>neutral<\/strong>, not a <strong>+2 ion<\/strong>.<\/li>\n\n\n\n<li><strong>Sulfur<\/strong>: Has 16 electrons, so its neutral configuration is shorter than the one given.<\/li>\n\n\n\n<li><strong>Chlorine<\/strong>: Has 17 electrons, so also shorter than the given configuration.<\/li>\n\n\n\n<li><strong>Potassium (neutral)<\/strong>: Has 19 electrons, so its configuration would include a 4s\u00b9.<\/li>\n\n\n\n<li><strong>Potassium ion (K\u207a)<\/strong>: Has 18 electrons, and matches the configuration, but it is a <strong>+1 ion<\/strong>, not +2.<\/li>\n<\/ul>\n\n\n\n<p>Thus, the correct match for the given configuration is <strong>calcium ion (Ca\u00b2\u207a)<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"722\" height=\"1024\" src=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner10-94.jpeg\" alt=\"\" class=\"wp-image-26311\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner10-94.jpeg 722w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner10-94-212x300.jpeg 212w\" sizes=\"auto, (max-width: 722px) 100vw, 722px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Which element\/ion has this electron configuration: [1s22s22p63s23p6]+2 Group of answer choices argon (neutral) sulfur calcium ion chlorine potassium ion potassium (neutral) The Correct Answer and Explanation is: The correct answer is: calcium ion (Ca\u00b2\u207a) Explanation: To determine which element or ion has the electron configuration [1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076]\u207a\u00b2, we first count the total [&hellip;]<\/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-26310","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/26310","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=26310"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/26310\/revisions"}],"predecessor-version":[{"id":26312,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/26310\/revisions\/26312"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=26310"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=26310"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=26310"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}