{"id":5939,"date":"2020-10-13T11:54:54","date_gmt":"2020-10-13T06:24:54","guid":{"rendered":"http:\/\/astan.lk\/al_virtualclassroom\/?p=5939"},"modified":"2020-10-13T11:54:32","modified_gmt":"2020-10-13T06:24:32","slug":"electron-stability","status":"publish","type":"post","link":"https:\/\/astan.lk\/al_virtualclassroom\/electron-stability\/","title":{"rendered":"Electronic configuration"},"content":{"rendered":"<h3><span style=\"text-decoration: underline;\"><strong>Principles and rules relevant to the filling up pattern of electrons <\/strong><\/span><\/h3>\n<p><strong><span style=\"text-decoration: underline;\">Hund\u2019s rule<\/span><\/strong><\/p>\n<p>Orbitals of the same energy (degenerate) are occupied by electrons singly so that their spins are parallel to make the maximum number of unpaired electrons and then doubly with their spins anti parallel.<\/p>\n<p><span style=\"text-decoration: underline;\"><strong>Pauli\u2019s exclusion principle<\/strong><\/span><\/p>\n<p>This principle states that no orbital can accommodate more than two electrons (In other words the set of quantum numbers for a certain electron of an atom is exclusive for it or no two electrons in an atom can have the same set of quantum numbers.)<\/p>\n<p><strong><span style=\"text-decoration: underline;\"> Aufbau principle <\/span><\/strong><\/p>\n<p>It states that the filling up of electrons in the orbitals takes place according to the increasing order of energy of the orbitals in accordance with the Pauli exclusion principle.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/subshells-diagram.jpg\"><strong>Ascending order of energy in the sub energy levels<\/strong><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-8265\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/subshells-diagram.jpg\" alt=\"subshells-diagram\" width=\"236\" height=\"188\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Graph showing the variation of first ionization energies of elements of atomic number<\/strong><\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/ionization-energy-variation-with-atomic-number-period.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-8268\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/ionization-energy-variation-with-atomic-number-period.gif\" alt=\"ionization-energy-variation-with-atomic-number-period\" width=\"368\" height=\"276\" \/><\/a><\/p>\n<p>Anomalous behaviour seen from group II to III and from group V to VI is due to extra stability of half-filled (p\u00b3 ) and completely-filled shells (s\u00b2 , p\u2076 ). Electronic configurations d\u2075 and d\u00b9\u2070 also exhibit extra stability.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Principles and rules relevant to the filling up pattern of electrons Hund\u2019s rule Orbitals of the same energy (degenerate) are occupied by electrons singly so that their spins are parallel to make the maximum number of unpaired electrons and then doubly with their spins anti parallel. Pauli\u2019s exclusion principle This principle states that no orbital [&hellip;]<\/p>\n","protected":false},"author":842,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[14,1652],"tags":[],"class_list":["post-5939","post","type-post","status-publish","format-standard","hentry","category-chemistry","category-unit-01"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Electronic configuration - Learning &amp; Education Portal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/astan.lk\/al_virtualclassroom\/electron-stability\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Electronic configuration - Learning &amp; Education Portal\" \/>\n<meta property=\"og:description\" content=\"Principles and rules relevant to the filling up pattern of electrons Hund\u2019s rule Orbitals of the same energy (degenerate) are occupied by electrons singly so that their spins are parallel to make the maximum number of unpaired electrons and then doubly with their spins anti parallel. 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