{"id":236200,"date":"2025-06-16T05:59:15","date_gmt":"2025-06-16T05:59:15","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=236200"},"modified":"2025-06-16T05:59:17","modified_gmt":"2025-06-16T05:59:17","slug":"how-many-core-and-valence-electrons-does-one-atom-of-magnesium-mg-have","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/16\/how-many-core-and-valence-electrons-does-one-atom-of-magnesium-mg-have\/","title":{"rendered":"How many core and valence electrons does one atom of magnesium (Mg) have"},"content":{"rendered":"\n<p>How many core and valence electrons does one atom of magnesium (Mg) have? 2 core and 10 valence 6 core and 6 valence 10 core and 2 valence 4 core and 8 valence<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>Correct Answer:<\/strong> <strong>10 core and 2 valence<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Magnesium (Mg) has an atomic number of 12, indicating it possesses 12 electrons in a neutral atom. These electrons are distributed among various energy levels or shells based on the principles of atomic structure.<\/p>\n\n\n\n<p>The electron configuration of magnesium is:<br><strong>1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2<\/strong><\/p>\n\n\n\n<p>This notation shows that:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The first energy level (1s\u00b2) contains 2 electrons.<\/li>\n\n\n\n<li>The second energy level (2s\u00b2 2p\u2076) contains 8 electrons.<\/li>\n\n\n\n<li>The third energy level (3s\u00b2) contains 2 electrons.<\/li>\n<\/ul>\n\n\n\n<p>Electrons located in the innermost shells (1s and 2s\/2p) are referred to as <strong>core electrons<\/strong>. These do not participate in bonding or chemical reactions under normal conditions. In this case, the 2 electrons in the 1s orbital and the 8 electrons in the 2s and 2p orbitals make up the <strong>10 core electrons<\/strong> in magnesium.<\/p>\n\n\n\n<p>Electrons in the outermost shell, which in this case is the <strong>3s\u00b2<\/strong>, are called <strong>valence electrons<\/strong>. These are the electrons involved in chemical bonding and determine the chemical properties of the element. For magnesium, there are <strong>2 valence electrons<\/strong> in the 3s orbital.<\/p>\n\n\n\n<p>Valence electrons play a critical role in the formation of chemical compounds. Magnesium, with its 2 valence electrons, often loses both during chemical reactions to achieve a stable noble gas configuration, forming a Mg\u00b2\u207a ion in the process.<\/p>\n\n\n\n<p>In summary, a neutral magnesium atom contains <strong>10 core electrons<\/strong> and <strong>2 valence electrons<\/strong>, corresponding to the electron distribution up to the third energy level.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner5-656.jpeg\" alt=\"\" class=\"wp-image-236201\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>How many core and valence electrons does one atom of magnesium (Mg) have? 2 core and 10 valence 6 core and 6 valence 10 core and 2 valence 4 core and 8 valence The Correct Answer and Explanation is: Correct Answer: 10 core and 2 valence Magnesium (Mg) has an atomic number of 12, indicating [&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 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